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Synthesis and Magnetic Properties of Mn/Fe/Co Binary Solid Solution in the A-site of V2SnC-MAX Phases 认领 引用
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作者 YAN Ming DENG Yuxiao +2 位作者 YAN Zhuanlong LI Hongyu CAO Mengyang 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS CSCD 2026年第2期353-363,共11页
This study reported the synthesis of magnetic solid solutions V2(AxBySn1-x-y)C(where A and B are Mn,Fe,or Co)MAX phases.These materials were prepared by incorporating magnetic elements into the V2SnC MAX p... This study reported the synthesis of magnetic solid solutions V2(AxBySn1-x-y)C(where A and B are Mn,Fe,or Co)MAX phases.These materials were prepared by incorporating magnetic elements into the V2SnC MAX phase via pressure-less sintering at 1000℃for 3 hours.XRD analysis reveals that the composition with x=y=0.2 exhibits a shift of diffraction peaks to higher angles,indicating lattice parameter changes,and achieves the highest phase purity with the maximum solid solution limit,further increases in the dopant content led to the formation of impurities.While the solid solution of magnetic elements preserves the characteristic layered structure of the MAX phase,it successfully induces magnetic properties.The magnetic transition temperatures for these solid solutions ranges from 61 to 200 K.Specifically,V2(MnxCoySn1-x-y)C demonstrated hard magnetic characteristics,with a high saturation magnetization(6.536 emu/g)and large remanence(4.236 emu/g).In contrast,V2(MnxFeySn1-x-y)C and V2(FexCoySn1-x-y)C exhibits soft magnetic behavior,evidenced by their narrow hysteresis loops and low coercivity.Their saturation magnetization values are 3.80 and 1.784 emu/g,respectively.The distinctly"S"-shaped hysteresis loop of V2(FexCoySn1-x-y)C further confirms its soft magnetic nature. 展开更多
关键词 V2SnC solid solution pressure less sintering magnetic MAX phase density functional theory
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Engineering surface and subsurface oxygen vacancies of CexZr1-xO2 solid solution for enhanced total toluene oxidation 认领 引用 被引量：1
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作者 Yang Yu Mingjia Zhang +5 位作者 Huangang Shi Jifa Qu Yongheng Xiong Wenyi Tan Xinlei Ge Qijie Jin 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2025年第12期39-49,共11页
Most studies have shown that oxygen vacancies on CexZr1-xO2 solid solution are important for enhancing the catalytic oxidation performance.However,a handful of studies investigated the different roles of surf... Most studies have shown that oxygen vacancies on CexZr1-xO2 solid solution are important for enhancing the catalytic oxidation performance.However,a handful of studies investigated the different roles of surface and subsurface oxygen vacancies on the performance and mechanisms of catalysts.Herein,a series of zirconium doping on CeO2 samples(CeO2,Ce0.95Zr0.05O2,and Ce0.85Zr0.15O2)with various surface-to-subsurface oxygen vacancies ratios have been synthesized and applied in toluene catalytic oxidation.The obtained Ce0.95Zr0.05O2 exhibits an excellent catalytic performance with a 90%toluene conversion at 295℃,which is 68℃lower than that of CeO2.Additionally,the obtained Ce0.95Zr0.05O2catalyst also exhibited good catalytic stability and water resistance.The XRD and HRTEM results show that Zr ions are incorporated into CeO2 lattice,forming CexZr1-xO2 solid solution.Temperature-programmed experiments reveal that Ce0.95Zr0.05O2 shows excellent lowtemperature reducibility and abundant surface oxygen species.In-situ DRIFTS tests were used to probe the reaction mechanism,and the function of Zr doping in promoting the activation of oxygen was further determined.Density functional theory(DFT)calculations indicate that the vacancy formation energy and O2 adsorption energy are both lower on Ce0.95Zr0.05O2,confirming the reason for its superior catalytic performance. 展开更多
关键词 CexZr1-xO2solid solution Toluene oxidation Surface oxygen species DFT calculations
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Thermoelectric Performance of CuInSe2‑ZnSe Solid Solution 认领 引用
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作者 Chengwei Sun Wang Li +6 位作者 Chengjun Li Yingchao Wei Wenyuan Ma Xin Li Qinghui Jiang Yubo Luo Junyou Yang 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2025年第5期823-830,共8页
CuInSe2 is an N-type diamond-like semiconductors thermoelectric candidate for power generation at medium temperature with its environmentally friendly and cost-effective properties.However,the intrinsic high therma... CuInSe2 is an N-type diamond-like semiconductors thermoelectric candidate for power generation at medium temperature with its environmentally friendly and cost-effective properties.However,the intrinsic high thermal conductivity of CuInSe2 limits the enhancement of its thermoelectric performance.Herein,we investigate the thermoelectric performance of N-type CuInSe2 materials by incorporating ZnSe through a solid solution strategy.A series of(CuInSe2)1-x(ZnSe)x(x=0.0,0.2,0.4,0.6,0.8,1.0)samples were synthesized,forming continuous solid solutions,while introducing minor porosity.ZnSe solid solution effectively reduces the lattice thermal conductivity of the CuInSe2 matrix at near-room temperatures,but has a weaker effect at higher temperatures.Due to the intrinsic low carrier concentration of the system,resulting in high resistivity,the maximum figure of merit(ZT)of(CuInSe2)0.8(ZnSe)0.2 reaches 0.08 at 773 K.Despite the relatively low ZT,the solid solution strategy proves effective in reducing the lattice thermal conductivity near-room temperature and offers potential for cost-effective thermoelectric materials. 展开更多
关键词 Thermoelectric CuInSe2 ZnSe Solid Solution
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Hydrogen production from dry reforming of methane,using CO2previously chemisorbed in the Li6Zn1-xNixO4solid solution 认领 引用
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作者 Yocelin B.González-González Fernando Plascencia-Hernández +1 位作者 Rubén Mendoza-Cruz Heriberto Pfeiffer 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2025年第3期535-550,共16页
Li6ZnO4was chemically modified by nickel addition,in order to develop different compositions of the solid solution Li6Zn1-xNixO4.These materials were evaluated bifunctionally;analyzing their CO2ca... Li6ZnO4was chemically modified by nickel addition,in order to develop different compositions of the solid solution Li6Zn1-xNixO4.These materials were evaluated bifunctionally;analyzing their CO2capture performances,aswell as on their catalytic properties for H2production via dry reforming of methane(DRM).The crystal structures of Li6Zn1-xNixO4solid solution samples were determined through X-ray diffraction,which confirmed the integration of nickel ions up to a concentration around 20 mol%,meanwhile beyond this value,a secondary phase was detected.These results were supported by XPS and TEM analyses.Then,dynamic and isothermal thermogravimetric analyses of CO2capture revealed that Li6Zn1-xNixO4solid solution samples exhibited good CO2chemisorption efficiencies,similarly to the pristine Li6ZnO4chemisorption trends observed.Moreover,a kinetic analysis of CO2isothermal chemisorptions,using the Avrami-Erofeev model,evidenced an increment of the constant rates as a function of the Ni content.Since Ni2+ions incorporation did not reduce the CO2capture efficiency and kinetics,the catalytic properties of thesematerialswere evaluated in the DRM process.Results demonstrated that nickel ions favored hydrogen(H2)production over the pristine Li6ZnO4phase,despite a second H2 production reaction was determined,methane decomposition.Thereby,Li6Zn1-xNixO4ceramics can be employed as bifunctional materials. 展开更多
关键词 Dry reforming of methane(DRM) CO2chemisorption H2production Solid solution Li6ZnO4
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Effect of B2O3 and Na2B4O7 on phosphorus enrichment in Ca2SiO4–Ca3(PO4)2 solid solutions 认领 引用
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作者 Xin Ping Fang Zhang +2 位作者 Jun Peng Hong-tao Chang Shuang Liu 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2025年第6期1502-1513,共12页
To separate the phosphorus-containing phase from steel slag,the effects of B2O3and Na2B4O7on the enrichment of phosphorus-containing phases in Ca2SiO4–Ca3(PO4)2(C2S–C3P)solid solu... To separate the phosphorus-containing phase from steel slag,the effects of B2O3and Na2B4O7on the enrichment of phosphorus-containing phases in Ca2SiO4–Ca3(PO4)2(C2S–C3P)solid solution were comparatively analyzed through theoretical calculations and experimental investigations.The results indicate that the optimum reaction temperature between B2O3and C2S–C3P is 800℃.The phase compositions of C2S–C3P equilibrium system with 5 wt.%B2O3at 800℃ included Ca3(PO4)2,CaSiO3and Ca11B2Si4O22,among which the content of Ca3(PO4)2was the highest.For C2S–C3P with 5 wt.%Na2B4O7equilibrium system,Ca3(PO4)2,CaSiO3,Ca11B2Si4O22and Na2Ca2P2O8were independent at 390–690℃.Ca3(PO4)2and Ca2SiO4precipitated in the solid solution when the addition of B2O3was more than 6 wt.%,and the content of Ca3(PO4)2raised with the increase in the addition of B2O3.The main phases in the C2S–C3P solid solution with Na2B4O7were(Ca2SiO4)0.05[Ca3(PO4)2],Ca2SiO4and Na3Ca6(PO4)5at 650℃.And when the addition of Na2B4O7exceeded 6 wt.%,the content of Na3Ca6(PO4)5increased significantly.There was no precipitation of Ca3(PO4)2or boron-containing phase in the samples with Na2B4O7,but a small proportion of Ca3(PO4)2transformed into(Ca2SiO4)0.05[Ca3(PO4)2],and Ca2+was partially replaced by Na+to generate Na3Ca6(PO4)5.As a result,the temperature for Na2B4O7to enrich the phosphorus-containing phase in C2S–C3P solid solution was lower than that for B2O3.However,the grade of the phosphorus-containing phase for Na2B4O7was lower than that for B2O3. 展开更多
关键词 B2O3 Na2B4O7 Ca2SiO4-Ca3(PO4)2solid solution Phosphorus enrichment
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Low-dose X-ray induced long afterglow NIR luminescence from Cr3+doped Zn1-xCdxGa2O4spinel solid solutions 认领 引用
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作者 Tingting Zhao Wenzhi Sun +4 位作者 Shuya Wang Wei Meng Chunqing Fu Xiaoyan Fu Hongwu Zhang 《Journal of Rare Earths》 SCIE EI CAS CSCD 2025年第2期246-252,I0001,共7页
The low-dose X-ray induced long afterglow near infrared(NIR)luminescence from Cr3+doped Zn1-xCdxGa2O4spinel solid solutions was investigated.The structure analysis shows the good formation of Zn1-xCd... The low-dose X-ray induced long afterglow near infrared(NIR)luminescence from Cr3+doped Zn1-xCdxGa2O4spinel solid solutions was investigated.The structure analysis shows the good formation of Zn1-xCdxGa2O4spinel solid solutions,which possesses a cubic spinel structure with Fd3m space group.The formation of Zn1-xCdxGa2O4spinel solid solutions induces the obvious increase of long afterglow near infrared luminescence excited by low-dose X-ray,When the content of doped Cd2+reaches 0.1,the low-dose X-ray induced long afterglow NIR luminescence is the maximum.More importantly,only 5 s Xray irradiation can induce more than 6 h NIR afterglow emission,of which the afterglow luminescent intensity is still 5 times stronger than the background intensity after 6 h.The thermoluminescent results show that under the 5 s exposure of X-ray,the trap density of Zn0.9Cd0.1Ga2O4:Cr3+is much higher than that of ZnGa2O4:Cr3+.The replacement of Cd2+ions with large radius at Zn2+sites causes the increase of de fects and dislocations,which results in the obvious increase of trap co ncentrations.And the addition of high-z number elements Cd2+would enhance the X-ray absorption of the solid solutions,which thus can be easily excited by low-dose X-ray.Zn0.9Cd0.1Ga2O4:1%Cr3+solid solution is a potential candidate of lowdose X-ray induced long afterglow luminescent materials. 展开更多
关键词 Zn1-xCdxGa2O4:1%Cr3+ Phosphors Solid solutions X-ray induced long afterglow luminescence Rare earths
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Promoter of (Ce-Zr)O_2 Solid Solution Modified by Praseodymia in Three-Way Catalysts 认领 引用 被引量：4
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作者 汪文栋 林培琰 +4 位作者 孟明 伏义路 胡天斗 谢亚宁 刘涛 《Journal of Rare Earths》 SCIE EI CAS 2003年第4期430-435,共6页
The three way catalysts (TWCs) promoters (Ce Zr)O 2, (Pr Ce Zr)O 2 and (Pr Zr)O 2 were prepared by sol gel like method. They were characterized by XRD, EXAFS and BET surface area determination. The reduction features ... The three way catalysts (TWCs) promoters (Ce Zr)O 2, (Pr Ce Zr)O 2 and (Pr Zr)O 2 were prepared by sol gel like method. They were characterized by XRD, EXAFS and BET surface area determination. The reduction features of the promoters were measured by temperature programmed reduction (TPR) of H 2 to access the potential for the promoters containing praseodymia as oxygen storage component in three way catalyst. The (Pr Zr)O 2 cubic solid solution is formed at high temperature up to 800 ℃, which makes it more reducible than the (Ce Zr)O 2 solid solution. For the (Pr Ce Zr)O 2 samples, the ternary solid solution plays an important role in the reduction process. The performance of the three way catalysts with fully formulated Pt, Pd and Rh is proceeded by using both light off temperature under a stoichiometric gas composition and the conversion of CO, C 3H 6 and NO under changing air/fuel ratio at a constant reaction temperature 400 ℃ . The results indicate that a small amount of praseodymia doping into (Ce Zr)O 2 favors the light off temperature of C 3H 6 and NO, and all the catalysts containing praseodymia obviously exhibits enhanced width of S value for NO conversion at lean region ( S ≥1.00). 展开更多
关键词 catalytic chemistry praseodymium (Ce Zr)O 2 solid solution three way catalysts rare earths
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In-situ exsolved ultrafine Ni nanoparticles from CeZrNiO2solid solution for efficient photothermal catalytic CO2reduction by CH4 认领 引用 被引量：7
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作者 Guanrui Ji Lei Ji +6 位作者 Shaowen Wu Lingxin Meng Yuteng Jia Zhanning Liu Shihua Dong Jian Tian Yuanzhi Li 《Advanced Powder Materials》 2024年第3期86-94,共9页
CO2reduction by CH4(CRM)to produce fuel is of great significance for solar energy storage and eliminating greenhouse gas.Herein,the catalyst of ultrafine Ni nanoparticles supported on CeZrNiO2solid solution(Ni@C... CO2reduction by CH4(CRM)to produce fuel is of great significance for solar energy storage and eliminating greenhouse gas.Herein,the catalyst of ultrafine Ni nanoparticles supported on CeZrNiO2solid solution(Ni@CZNO)was synthesized by the sol-gel method.High yield of H2and CO(58.0 and 69.8 mmol min-1g-1)and excellent durability(50 h)were achieved by photothermal catalytic CRM merely under focused light irradiation.Structural characterization and DFT calculations reveal that CZNO has rich oxygen vacancies that can adsorb and activate CO2to produce reactive oxygen species.Oxygen species are transferred to ultrafine Ni nanoparticles through the rich Ni-CZNO interface to accelerate carbon oxidation,thereby maintaining the excellent catalytic stability of the catalyst.Moreover,the experimental results reveal that light irradiation can not only enhance the photothermal catalytic CRM activity through photothermal conversion and molecular activation,but also improve the stability by increasing the concentration of oxygen vacancies and inhibiting CO disproportionation. 展开更多
关键词 Photothermal catalysis CO2reduction CeZrNiO2 solid solution Photoactivation Stability
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Preparation and Characterization of CeO_2-ZrO_2 Solid Solution Ultrafine Particles Using Reversed Microemulsion 认领 引用 被引量：5
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作者 安源 李丽 +1 位作者 王军 沈美庆 《Journal of Rare Earths》 SCIE EI CAS 2005年第4期416-419,共4页
Ce0.6Zr0.4O2 solid solution ultrafine particle was prepared in the cyclohexane/water/OP-10-hexanol reversed microemulsion. The quasi-ternary phase diagram investigations showed that the system has narrow W/O type micr... Ce0.6Zr0.4O2 solid solution ultrafine particle was prepared in the cyclohexane/water/OP-10-hexanol reversed microemulsion. The quasi-ternary phase diagram investigations showed that the system has narrow W/O type microemulison region, so it is the proper system to prepare Ce0.6Zr0.4O2 solid solution ultrafine particle. Some physical-chemical techniques such as TG/DTA, XRD, BET, and HRTEM are used to characterize the resultant powders. The results show that the fluorite cubic Ce0.6Zr0.4O2 solid solution is obtained at 400 ℃. The surface area is （146.7 m^2·g^-1）, which is higher than the surface area for sol-gel prepared sample （59.5m^2·g^-1）. HRTEM images indicated that the Ce0.6Zr0.4O2 solid solution ultrafine particle is well-crystallized, narrow size distribution, less agglomeration, within mean size of 5 -7 nm. 展开更多
关键词 reverse microemulsion CeO2-ZrO2 solid solution ultrafine particle rare earths
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Identification of optimal solid solution temperature for Sm2Co17-type permanent magnets with different Fe contents 认领 引用 被引量：6
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作者 Shuai Wang Hong-Sheng Chen +4 位作者 Yi-Kun Fang Chao Wang Lei Wang Ming-Gang Zhu Wei Li 《Rare Metals》 SCIE EI CAS CSCD 2021年第12期3567-3574,共8页
It is confirmed that the solid solution temperature range to obtain optimal magnetic properties is different for the magnets with different Fe contents,and the correlation between magnetic properties and microstructur... It is confirmed that the solid solution temperature range to obtain optimal magnetic properties is different for the magnets with different Fe contents,and the correlation between magnetic properties and microstructures influenced by solid solution temperature(Ts)has been systematically studied.The optimal solid solution temperature range is 1413-1463 K for the Sm(CobalFe0.213Cu0.073Zr0.024)7.6magnet,which is higher than that of the Sm(CobalFe0.262Cu0.073Zr0.024)7.6magnet(1403-1453 K),and the optimal T_s range is about 50 K for both of the magnets.The solid solution temperature range shifting toward relatively high temperature is due to the increase in a phase transition temperature.The magnet solution-treated at proper temperature exhibits 1:7 H single phase,and intact cell structure and high Cu concentration(23.12 at%)in the cell boundary are found after aging process,which makes the magnet shows high intrinsic coercivity(Hcj)and magnetic field at knee-point(Hknee).At a lower solid solution temperature,the 2:17 H,1:5 H and Zr-rich precipitation phases appear,which affects the cell structure,density of lamellar phase and Cu concentration in the cell boundary,leading to the reduced magnetic properties.However,at a higher solid solution temperature,there exist obviously light gray and dark regions with different Sm,Cu and Fe contents in scanning electron microscopy observation,and the magnet shows low pinning field in the two regions and incomplete cell structure,resulting in an inferior Hcjand Hknee. 展开更多
关键词 Sm2co17-type magnets Magnetic properties Solid solution treatment Iron content Microstructures
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The variation of microstructures,spectral characteristics and catalysis effects of Fe^3+ and Zn^2+ co-doped CeO2 solid solutions 认领 引用 被引量：5
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作者 Guofang Zhang Yiming Li +2 位作者 Xin Zhao Jianyi Xu Yanghuan Zhang 《Journal of Rare Earths》 SCIE EI CAS CSCD 2020年第3期241-249,共9页
Fe^3+and Zn^2+ions were doped into the lattice of CeO2 via the hydrothermal method.The micro structure and spectra features were analyzed systemically.XRD results show that the solid solubility of Fe^3+and Zn^2+ions i... Fe^3+and Zn^2+ions were doped into the lattice of CeO2 via the hydrothermal method.The micro structure and spectra features were analyzed systemically.XRD results show that the solid solubility of Fe^3+and Zn^2+ions in Ce1-x(Fe0.5Zn0.5)xO2 can be identified as x=0.16.The cell volumes are decreased by increasing the doped content.The TEM graphs prove that the grain size of the sample is about 10 nm,and the EDS result indicates that the doped contents are in accordance with that of the theory concentrations.Meanwhile,the doping also causes the increasing concentrations of the defects and oxygen vacancies which are supported by the XPS,Raman,UV and PL characterizations.The samples exhibit better catalytic activities for improving the hydrogen storage properties and the electrochemical kinetics of the ball milled Mg2Ni based composites.Further,the catalysis effects are improved by increasing the doped contents,which can be ascribed to the increasing contents of the oxygen vacancies,defects,the special electron transition states and the nature of the doped ions in CeO2-based solid solutions. 展开更多
关键词 Ce1-x(Fe0.5Zn0.5)xO2 solid solutions Hydrothermal method Hydrogen storage Catalysis Rare earths
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Distribution of P2O5 between solid solution and liquid phase in dephosphorization slag of CaO-SiO2-FeO-P2O5-Na2O system 认领 引用 被引量：3
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作者 Chuan-ming Du Ning-ning Lv +3 位作者 Chang Su Wei-ming Liu Jin-xing Yang Hai-chuan Wang 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2019年第11期1162-1170,共9页
A multi-phase slag containing Na2O is potential to efficiently dephosphorize high-P hot metal.After dephosphorization,the generated slag with high P2O5 content is regarded as a P resource.Because P2O5 was mainly conce... A multi-phase slag containing Na2O is potential to efficiently dephosphorize high-P hot metal.After dephosphorization,the generated slag with high P2O5 content is regarded as a P resource.Because P2O5 was mainly concentrated in the 2CaO SiO2-3CaO P2O5 solid solution,the recovery of P from dephosphorization slag primarily depends on the separation of the solid solution from other phases.The distribution ratios of P2O5 between solid solution and liquid phase in the CaOSiO2-FeO-P2O5-Nslag system were investigated.The results indicated that the addition of Na2O facilitated the enrichment of P2O5 in the solid solution because it increased not only the distribution ratio of P2O5 but also the mass fraction of the solid solution.The distribution ratio of P2O5 was independent of the P2O5 content in slag.A higher P2O5 content in slag resulted in higher P2O5 and Na2O contents in the solid solution.The distribution ratio of P2O5 increased with the total Fe content in the liquid phase,regardless of the valence of Fe.An increase in the FeO content in slag brought a higher P2O5 content in the solid solution.As slag basicity increased,the distribution ratio of P2O5 increased,but the P2O5 content in the solid solution decreased. 展开更多
关键词 Dephosphorization Steelmaking slag Distribution ratio P2O5 2CaO·SiO2-3CaO·P2O5 solid solution
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Research on micro-structure and catalysis properties of nanosized Ce1–x(Fe0.5Eu0.5)_xO2–δ solid solutions 认领 引用 被引量：5
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作者 ZHANG Guofang XU Jianyi +1 位作者 HOU Zhonghui WANG Qingchun 《Journal of Rare Earths》 SCIE EI CAS CSCD 2017年第1期63-70,共8页
Nanosized Fe^3＋ and Eu^3＋ codoped CeO2 solid solutions were synthesized via hydrothermal method. The crystalline structure of Ce1-x（Fe0.5Eu0.5）xO2-δx=0.00–0.30） solid solutions was carried out by the X-ray diff... Nanosized Fe^3＋ and Eu^3＋ codoped CeO2 solid solutions were synthesized via hydrothermal method. The crystalline structure of Ce1-x（Fe0.5Eu0.5）xO2-δx=0.00–0.30） solid solutions was carried out by the X-ray diffraction technique, and the spectrum features were identified by UV-Vis and Raman spectroscopy, respectively. It was observed that the cell parameters were first increased then decreased by increasing the doped ions content. The phase separation was detected when the dopant concentration reached to x=0.30. UV-Vis spectrum showed that the width of the band gap gradually reduced by increasing the doped content, and the solid solubility was determined to be x=0.20. The Raman technique displayed that the peak position of F2g mode gradually shifted to lower frequencies from 465 cm^–1 for x=0.00 to 440 cm^–1 for x=0.20. The catalytic effects of Ce1-x（Fe0.5Eu0.5）xO2-δsolid solutions on the electrochemistry properties of Mg2Ni/Ni were measured by mixing them together via ball milling technique. The electrochemical properties of the Mg_2Ni/Ni-Ce1-x（Fe0.5Eu0.5）xO2-δcomposites showed that the maximum discharge capability Cmax and the cycle stability were improved obviously. Meanwhile, the EIS characteristic also indicated that the doped solid solutions could enhance the rate of charge transfer on the surface of alloy. The catalytic effect of the solid solutions was speculated to rely on both the concentration of oxygen vacancies and the cell volumes of the solid solutions. 展开更多
关键词 solid solution hydrothermal Mg2Ni catalysis effect electrochemistry property rare earths
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Three-dimensionally ordered macroporous SnO_2-based solid solution catalysts for effective soot oxidation 认领 引用 被引量：3
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作者 Cheng Rao Rui Liu +6 位作者 Xiaohui Feng Jiating Shen Honggen Peng Xianglan Xu Xiuzhong Fang Jianjun Liu Xiang Wang 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2018年第10期1683-1694,共12页
A series of three‐dimensionally ordered macroporous(3DOM)SnO2‐based catalysts modified by the cations Ce4+,Mn3+,and Cu2+have been prepared by using a colloidal crystal templating method and tested for soot combustio... A series of three‐dimensionally ordered macroporous(3DOM)SnO2‐based catalysts modified by the cations Ce4+,Mn3+,and Cu2+have been prepared by using a colloidal crystal templating method and tested for soot combustion under loose contact condition.XRD and STEM mapping results confirm that all the secondary metal cations have entered the lattice matrix of tetragonal rutile SnO2 to form non‐continuous solid solutions,thus impeding crystallization and improving the surface areas and pore volumes of the modified catalysts.In comparison with regular SnO2 nanoparticles,the 3DOM SnO2 displays evidently improved activity,testifying that the formation of the 3DOM structure can anchor the soot particulates in the macro‐pores,which ensures that the contact of the soot particles with the active sites on the 3DOM skeleton is more easily formed,thus benefiting the target reaction.With the incorporation of the secondary metal cations,the activity of the catalyst can be further improved due to the formation of more abundant mobile oxygen species.In summary,these effects are believed to be the major factors responsible for the activity of the catalyst. 展开更多
关键词 Three‐dimensionally ordered macroporous catalyst Soot combustion SnO2 solid solution Lattice doping Oxygen vacancies
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Effects of two strategies on afterglow behavior of Lu2O3:Eu single crystal scintillator:Co-doping with Pr3+and solid solution with Sc2O3 认领 引用 被引量：6
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作者 Zhongjun Xue Dongzhou Ding +4 位作者 Yating Sima Zuyao Zhou Hanrui Dong Shuwen Zhao He Feng 《Journal of Rare Earths》 SCIE EI CAS CSCD 2023年第5期658-665,I0001,共8页
In this paper,effect of two strategies on afterglow behavior of Lu2O3:Eu single crystal scintillato r,Pr3+codoping and solid solution with Sc2O3,were studied systematically.Two groups of Lu2O3:5 a... In this paper,effect of two strategies on afterglow behavior of Lu2O3:Eu single crystal scintillato r,Pr3+codoping and solid solution with Sc2O3,were studied systematically.Two groups of Lu2O3:5 at%Eu,x at%Pr(x=0,0.2,0.5,1,2 and 5)and(Lu1-yScy)2O3:5 at%Eu(y=0,20 at%,50 at%and 70 at%)single crystals were grown by floating zone(FZ)method in air atmosphere.The structures of as-grown crystals were determined by X-ray diffraction(XRD).The scintillation,photoluminescence properties and carrier trap states were investigated through afterglow,X-ray excitation luminescence(XEL),transmittance,photoluminescence excitation(PLE)and photoluminescence(PL),PL decay and thermal stimulated luminescence(TSL)curves.It is found that with the increase of Pr3+concentration,the afterglow level of the system decreases at the expense of scintillation luminescence efficiency.Meanwhile,although Sc2O3:Eu presents much lower afterglow intensity than Lu2O3:Eu,the addition of Sc2O3will just increase the afterglow level of the(Lu1-yScy)2O3:5 at%Eu single crystal system.Possible mechanisms for above phenomena are discussed based on experimental results. 展开更多
关键词 Lu2O3:Eu Afterglow behavior Pr3+co-doping (Lu1-yScy)2O3solid solution Rare earths
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Effect of Preparation Method on Surface Area and Crystalline Form of CeO_2-ZrO_2 Solid Solution 认领 引用 被引量：2
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作者 王晓红 郭耘 +4 位作者 卢冠忠 郭杨龙 王筠松 张志刚 刘晓晖 《Journal of Rare Earths》 SCIE EI CAS 2004年第6期763-765,共3页
The CeO_2-ZrO_2 solid solutions were prepared by a reverse microemulsion method. The effect of preparation parameters on the surface area and crystalline form of the solid solutions were studied by the BET surface are... The CeO_2-ZrO_2 solid solutions were prepared by a reverse microemulsion method. The effect of preparation parameters on the surface area and crystalline form of the solid solutions were studied by the BET surface area and XRD analysis. The studies indicate that the separation of the microemulsion phase during the preparation procedure can decrease the specific surface area of sample, adding hydrogen peroxide in the matrix solution can increase the specific surface area and stability of sample. The surface area of sample calcined at 550 ℃ for 5 h is 149 m^2·g-1, and that calcined at 900 ℃ for 6 h is 88 m^2·g-1. The sample with tetragonal symmetry Ce0.5Zr0.5O_2 phase has a higher stability. 展开更多
关键词 reverse microemulsion method preparation CeO_2-ZrO_2 solid solution high surface area crystalline form rare earths
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Preparation and Characterization of Ce_x Th1-xO_2 Solid Solutions Prepared by Sol-Gel Method 认领 引用 被引量：3
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作者 赵雷洪 罗孟飞 刘广宇 《Journal of Rare Earths》 SCIE EI CAS 2005年第2期251-253,共3页
The Ce_xTh1-xO_2 solid solutions were prepared by citrate sol-gel method,and their structure and reduction properties were studied. XRD shows that solid solution with cubicphase formed in all the solid solutions (x... The Ce_xTh1-xO_2 solid solutions were prepared by citrate sol-gel method,and their structure and reduction properties were studied. XRD shows that solid solution with cubicphase formed in all the solid solutions (x = 0.2, 0.5, 0.8) Ce_xTh1-xO_2. Raman spectrum showsthat Ce-Th complex oxides can promote the formation of oxygen vacancies. Two reduction peaks appearin the TPR profiles of Ce_xTh1-xO_2 solid solution. The a peak is attributed to the reduction ofCe4+ on the surface, and the β peak is attributed to the reduction of bulk CeO_2. Theincorporation of Th atom into CeO_2 improves the reduction of CeO_2. Ce_xTh1-xO_2 mixed oxidesare promising materials for oxygen vacancies produced, as well as catalysts for many reactionsinvolved oxygen, such as the catalysts for three-way reactions for reducing the releasing pollutantsor combustion of VOCs. 展开更多
关键词 catalytic chemistry Ce_xTh1-xO_2 solid solution reduction properties rare earths
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Synthesis and thermoelectric properties of Mg_2Si1-xSn_x solid solutions by microwave irradiation 认领 引用 被引量：4
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作者 周书才 白晨光 《Journal of Central South University》 SCIE EI CAS 2012年第9期2421-2424,共4页
In order to reduce the oxidizing and volatilizing caused by Mg element in the traditional methods for synthesizing Mg2Sil-xSnx （x=0.2, 0.4, 0.6, 0.8） solid solutions, microwave irradiation techniques were used in pr... In order to reduce the oxidizing and volatilizing caused by Mg element in the traditional methods for synthesizing Mg2Sil-xSnx （x=0.2, 0.4, 0.6, 0.8） solid solutions, microwave irradiation techniques were used in preparing them as thermoelectric materials. Structure and phase composition of the obtained materials were investigated by X-ray diffraction （XRD）. The electrical conductivity, Seebeck coefficient and thermal conductivity were measured as a function of temperature from 300 to 750 K. It is found that Mg2Si1-xSnx solid solutions are well formed with excessive content of 5% （molar fraction） Mg from the stoichiometric MgESil.xSnx under microwave irradiation. A maximum dimensionless figure of merit, ZT, of about 0.26 is obtained for Mg2Si1-xSnx solid solutions at about 500 K for x=0.6. 展开更多
关键词 Mg2Si1-xSnx thermoelectric material solid solution microwave synthesis
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Investigation of lattice capacity effect on Cu2+-doped SnO2 solid solution catalysts to promote reaction performance toward NOx-SCR with NH3 认领 引用 被引量：1
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作者 Xianglan Xu Yunyan Tong +7 位作者 Jingyan Zhang Xiuzhong Fang Junwei Xu Fuyan Liu Jianjun Liu Wei Zhong Olga ELebedeva Xiang Wang 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2020年第5期877-888,共12页
To understand the effect of the doping amount of Cu^2+ on the structure and reactivity of SnO2 in NOx-SCR with NH3, a series of Sn-Cu-O binary oxide catalysts with different Sn/Cu ratios have been prepared and thoroug... To understand the effect of the doping amount of Cu^2+ on the structure and reactivity of SnO2 in NOx-SCR with NH3, a series of Sn-Cu-O binary oxide catalysts with different Sn/Cu ratios have been prepared and thoroughly characterized. Using the XRD extrapolation method, the SnO2 lattice capacity for Cu^2+ cations is determined at 0.10 g Cu O per g of SnO2, equaling a Sn/Cu molar ratio of 84/16. Therefore, in a tetragonal rutile SnO2 lattice, only a maximum of 16% of the Sn4+ cations can be replaced by Cu^2+ to form a stable solid solution structure. If the Cu content is higher, Cu O will form on the catalyst surface, which has a negative effect on the reaction performance. For samples in a pure solid solution phase, the number of surface defects increase with increasing Cu content until it reaches the lattice capacity, as confirmed by Raman spectroscopy. As a result, the amounts of both active oxygen species and acidic sites on the surface, which critically determine the reaction performance, also increase and reach the maximum level for the catalyst with a Cu content close to the lattice capacity. A distinct lattice capacity threshold effect on the structure and reactivity of Sn-Cu binary oxide catalysts has been observed. A Sn-Cu catalyst with the best reaction performance can be obtained by doping the SnO2 matrix with the lattice capacity amount of Cu^2+. 展开更多
关键词 SnO2-based solid solution Lattice capacity of Cu^2+ XRD extrapolation method NOx-SCR with NH3 Threshold effect
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In-situ assembly of 2D/3D porous nickel cobalt sulfide solid solution as superior pre-catalysts to boost multi-functional electrocatalytic oxidation 认领 引用 被引量：1
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作者 Pin Hao Xu Dong +6 位作者 Houguang Wen Ruirui Xu Junfeng Xie Qian Wang Guanwei Cui Jian Tian Bo Tang 《Chinese Chemical Letters》 SCIE CAS CSCD 2023年第5期365-368,共4页
In this work,we fabricated an efficient pre-catalyst based on(Ni,Co)S2solid solution with hierarchical architecture and high porosity to boost urea oxidation reaction and electrocatalytic oxidation of organic small mo... In this work,we fabricated an efficient pre-catalyst based on(Ni,Co)S2solid solution with hierarchical architecture and high porosity to boost urea oxidation reaction and electrocatalytic oxidation of organic small molecules.The interaction between Ni and Co can optimize the electronic structure,resulting in the improved conductivity and accelerated charge transfer rate.The 2D/3D architecture can enrich more active species and endow the mass and electron transport to facilitate the surface oxidation and the following catalytic process.Post-structure and catalytic characterizations confirm the surface oxidation of(Ni,Co)S2during the stability test,and the in-situ formed Co(Ni)based(oxy)hydroxides exhibit superior catalytic activity and facilitated charge transfer ability.As a result,the optimal(Ni,Co)S2solid solution pre-catalyst displays facilitated catalytic behavior and good stability for multifunctional electrocatalytic oxidation,in which a high conversion of benzyl alcohol(97.50%),a good selectivity to benzoic acid(93.78%)and a satisfied faraday efficiency(91.86%)can be achieved. 展开更多
关键词 Electrocatalytic oxidation (Ni Co)S2solid solution Pre-catalyst Urea oxidation reaction 2D/3D architecture
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