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Barium transport and isotopic fractionation in plants 认领 引用
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作者 Shuming Xu Congcong Cao +5 位作者 Chao Xiong Hairun Wang Ziqian Qiao Kai Li Yingzeng Gong Huimin Yu 《Acta Geochimica》 EI CAS CSCD 2026年第2期331-341,共11页
Excess barium(Ba)in soil can result in Ba overenrichment in crops,which may adversely affect human health.However,the transport and isotopic fractionation of Ba in plants remain poorly understood.We analyzed the Ba co... Excess barium(Ba)in soil can result in Ba overenrichment in crops,which may adversely affect human health.However,the transport and isotopic fractionation of Ba in plants remain poorly understood.We analyzed the Ba content and isotopic composition of three crops(rice,pak choi,and maize)grown in Ba-contaminated soil.Results for rice and maize demonstrated significant fractionation and environmental sensitivity in the transport of Ba,and longer flooding durations were found to increase Ba accumulation in rice grains during the filling stage.In contrast,research on pak choi revealed limited fractionation and strong uptake and transport of Ba.The estimated daily intake of Ba in the edible portion of pak choi(stems and leaves)was 15-24times the recommended daily intake of 0.2 mg/kg body weight per day.Therefore,pak choi was the least suitable crop for Ba-contaminated areas.This study provides new insights into how Ba isotopic fractionation can trace Ba transport in crops,offering practical applications for food safety and environmental monitoring. 展开更多
关键词 Barium pollution Plant Health risks Barium isotopes Fractionation
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Thickness dependence of the magnetic properties of barium ferrite films prepared by pulsed laser deposition 认领 引用
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作者 Chengbo Zhao Bowei Han +5 位作者 Yuchen Zhao Yang Sun Lichen Wang Ruoshui Liu Yunzhong Chen Dengjing Wang 《Chinese Physics B》 SCIE EI CAS CSCD 2026年第2期591-594,共4页
BaFe12O19(BaM)thin films with thicknesses ranging from 15 nm–200 nm were deposited on Al2O3(0001)substrates by pulsed laser deposition(PLD).X-ray diffraction patterns show that a buffer layer with a thick... BaFe12O19(BaM)thin films with thicknesses ranging from 15 nm–200 nm were deposited on Al2O3(0001)substrates by pulsed laser deposition(PLD).X-ray diffraction patterns show that a buffer layer with a thickness of nearly 60 nm forms on the substrate,and then a c-axis perpendicularly oriented Ba M thin film grows on the buffer layer.Atomic force microscopy results indicate that the Ba M thin film exhibits a spiral island growth mode on the buffer layer.Magnetic hysteresis loop results confirm that the buffer layer exhibits no significant magnetic anisotropy,while the Ba M thin film exhibits perpendicular magnetic anisotropy.The out-of-plane coercivity decreases with increasing Ba M thin-film thickness due to the combined effect of grain size growth and lattice strain relaxation.The 200 nm thick film exhibits optimum magnetic properties with Ms=319 emu/cm3 and Hc=1546 Oe. 展开更多
关键词 pulsed laser deposition barium hexaferrite film self-made buffer layer perpendicular magnetic anisotropy film thickness
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Synergistic Modulation of Magnetic and Dielectric Properties via La‐V Co‐Substitution in Barium Hexaferrite for Advanced Millimeter‐Wave Absorption 认领 引用
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作者 Zhihui Yang Jiewu Cui +5 位作者 Pengjie Zhang Song Ma Wei Sun Xiaohui Liang Yong Zhang Yucheng Wu 《Rare Metals》 SCIE EI CAS CSCD 2026年第6期613-624,共12页
The growing deployment of high‐frequency electronic systems has intensified the demand for high‐performance microwave absorption materials.In this work,we developed La‐V co‐substituted barium hexaferrites,Ba_(1‐x... The growing deployment of high‐frequency electronic systems has intensified the demand for high‐performance microwave absorption materials.In this work,we developed La‐V co‐substituted barium hexaferrites,Ba1‐xLaxFe11.9V0.1O19(BLFVO),via a sol‐gel route.Comprehensive structural and electromagnetic analysis reveals that the co‐substitution induces synergistic magnetic and dielectric loss,leading to significantly improved impedance matching and attenuation capacity.The optimized sample achieves both a significantly reduced matching thickness and a broadened effective absorption bandwidth(EAB)in the Ka‐band(26.5-40 GHz).Specifically,within the Ka‐band,the BLFVO(x=0.4)sample achieves an effective absorption bandwidth of 7.29 GHz,a minimum reflection loss of−15.17 dB,and a matching thickness of 0.7 mm.Furthermore,the material also exhibits respectable absorption performance in the 2-18 GHz range,and its overall practical potential is confirmed by radar cross‐section(RCS)simulations.This study offers valuable insights for the rational design of ion‐substituted ferrites as high‐performance microwave absorbers. 展开更多
关键词 barium hexaferrite electromagnetic properties ion co‐substitution millimeter‐wave absorption
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Electromagnetic wave absorption and corrosion resistance performance of carbon nanoclusters/Ce-Mn codoped barium ferrite composite materials 认领 引用 被引量：8
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作者 Bo Li Lin Ma +7 位作者 Sinan Li Jiewu Cui Xiaohui Liang Wei Sun Pengjie Zhang Nan Huang Song Ma Zhidong Zhang 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2025年第3期699-709,共11页
To realize the application of electromagnetic wave absorption(EWA)devices in humid marine environments,bifunctional EWA materials with better EWA capacities and anticorrosion properties have great exploration signific... To realize the application of electromagnetic wave absorption(EWA)devices in humid marine environments,bifunctional EWA materials with better EWA capacities and anticorrosion properties have great exploration significance and systematic research re-quirements.By utilizing the low-cost and excellent magnetic and stable chemical characteristics of barium ferrite(BaFe12O19)and using the high dielectric loss and excellent chemical inertia of nanocarbon clusters,a new type of nanocomposites with carbon nanoclusters en-capsulating BaFe12O19was designed and synthesized by combining an impregnation method and a high-temperature calcination strategy.Furthermore,Ce-Mn ions were introduced into the BaFe12O19lattice to improve the dielectric and magnetic properties of BaFe12O19cores significantly,and the energy band structure of the doped lattice and the orders of Ce replacing Fe sites were calculated.Benefiting from Ce-Mn ion doping and carbon nanocluster encapsulation,the composite material exhibited excellent dual functionality of corrosion resist-ance and EWA.When BaCe0.2Mn0.3Fe11.5O19-C(BCM-C)was calcined at 600°C,the minimum reflection loss of-20.1 dB was achieved at 14.43 GHz.The Ku band’s effective absorption bandwidth of 4.25 GHz was achieved at an absorber thickness of only 1.3 mm.The BCM-C/polydimethylsiloxane coating had excellent corrosion resistance in the simulated marine environment(3.5wt%NaCl solution).The|Z|0.01Hz value of BCM-C remained at 106Ω·cm2after 12 soaking days.The successful preparation of the BaFe12O19composite en-capsulated with carbon nanoclusters provides new insights into the preparation of multifunctional absorbent materials and the fabrication of absorbent devices applied in humid marine environments in the future. 展开更多
关键词 electromagnetic wave absorption anticorrosion barium ferrite cerium and manganese doping carbon nanoclusters
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La-substituted W-type barium-nickel ferrites for tunable and high-performance electromagnetic wave absorption 认领 引用 被引量：1
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作者 Long Wang Jiurong Liu +7 位作者 Shenghui Xie Yanli Deng Zhou Wang Shanyue Hou Shengying Yue Gang Wang Na Wu Zhihui Zeng 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2025年第3期645-656,共12页
W-type barium-nickel ferrite(BaNi2Fe16O27)is a highly promising material for electromagnetic wave(EMW)absorption be-cause of its magnetic loss capability for EMW,low cost,large-scale production potential,high... W-type barium-nickel ferrite(BaNi2Fe16O27)is a highly promising material for electromagnetic wave(EMW)absorption be-cause of its magnetic loss capability for EMW,low cost,large-scale production potential,high-temperature resistance,and excellent chemical stability.However,the poor dielectric loss of magnetic ferrites hampers their utilization,hindering enhancement in their EMW-absorption performance.Developing efficient strategies that improve the EMW-absorption performance of ferrite is highly desired but re-mains challenging.Here,an efficient strategy substituting Ba2+with rare earth La3+in W-type ferrite was proposed for the preparation of novel La-substituted ferrites(Ba1-xLaxNi2Fe15.4O27).The influences of La3+substitution on ferrites’EMW-absorption performance and the dissipative mechanism toward EMW were systematically explored and discussed.La3+efficiently induced lattice defects,enhanced defect-induced polarization,and slightly reduced the ferrites’bandgap,enhancing the dielectric properties of the ferrites.La3+also enhanced the ferromagnetic resonance loss and strengthened magnetic properties.These effects considerably improved the EMW-absorption perform-ance of Ba1-xLaxNi2Fe15.4O27compared with pure W-type ferrites.When x=0.2,the best EMW-absorption performance was achieved with a minimum reflection loss of-55.6 dB and effective absorption bandwidth(EAB)of 3.44 GHz. 展开更多
关键词 electromagnetic wave absorption W-type barium ferrite rare earth dielectric
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Triboelectric Nanogenerators Based on Polyimide Membranes Doped with Barium Titanate Nanoparticles and Multi-Walled Carbon Nanotubes 认领 引用 被引量：1
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作者 LIU Jingjing AFZAL Syed Umer +1 位作者 WANG Kaibo YAN Jing 《Journal of Donghua University(English Edition)》 CAS 2025年第2期107-115,共9页
High performance is always the research objective in developing triboelectric nanogenerators(TENGs)for future versatile applications.In this study,flexible triboelectric membranes were prepared based on polyimide(PI)m... High performance is always the research objective in developing triboelectric nanogenerators(TENGs)for future versatile applications.In this study,flexible triboelectric membranes were prepared based on polyimide(PI)membranes doped with barium titanate(BTO)nanoparticles and multi-walled carbon nanotubes(MWCNTs).The piezoelectric BTO nanoparticles were incorporated to boost the electric outputs by the synergistic effect of piezoelectricity and triboelectricity and MWCNTs were incorporated to provide a microcapacitor structure for enhancing the performance of TENGs.When the mass fraction of the BTO nanoparticle was 10%and the mass fraction of the MWCNT was 0.1%,the corresponding TENG achieved optimum electric outputs(an open-circuit voltage of around 65 V,a short-circuit current of about 20.0μA and a transferred charge of about 25.0 nC),much higher than those of the TENG with a single PI membrane.The TENG is potentially used to supply energy for commercial light-emitting diodes and as self-powered sensors to monitor human physical training conditions.This research provides a guideline for developing TENGs with high performance,which is crucial for their long-term use. 展开更多
关键词 triboelectric nanogenerator(TENG) energy harvesting multi-walled carbon nanotube(MWCNT) barium titanate(BTO) polyimide(PI)
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Multifunctional applications of barium zinc vanadate nanoparticles for photocatalytic dye degradation, energy storage and sensing applications 认领 引用 被引量：2
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作者 S.Ishwarya H.P.Nagaswarupa +6 位作者 Yashwanth Venkatraman Naik Basavaraju N Ramachandra Naik Abdullah N.Alodhayb Saravanan Pandiaraj Burragoni Sravanthi Goud Jae Hong Kim 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2025年第12期3052-3071,共20页
The multifunctional characteristics of barium zinc vanadate(BaZnV2O7)nanoparticles(BZV NPs)were explored in this study,focusing on their photocatalytic activity,supercapacitor performance,and sensing abilities.X... The multifunctional characteristics of barium zinc vanadate(BaZnV2O7)nanoparticles(BZV NPs)were explored in this study,focusing on their photocatalytic activity,supercapacitor performance,and sensing abilities.X-ray diffraction analysis confirmed that the crystallites were 40.3 nm in size,whereas ultraviolet visible diffuse reflectance spectroscopy revealed an energy bandgap of 5.28 eV.Functional groups,elemental composition,and morphology were assessed using Fourier transform infrared spectroscopy,energy-dispers-ive X-ray spectroscopy,and scanning electron microscopy,respectively.The photocatalytic efficiency of the BZV NPs was evaluated at various catalyst dosages,dye concentrations,and pH levels,for the degradation of acid black-52(AB-52)dye under UV light.Cyclic voltammetry and galvanostatic charge-discharge analyses were performed to determine the energy storage and cyclic stability of the BZV-NP-modified carbon paste electrode.In addition,a novel electrochemical sensor based on BZV was developed to accurately detect the concentration of biomolecules and chemical drugs.BZV nanoparticles exhibited remarkable photocatalytic dye degradation up to 80.4%,indicating their application in waste water treatment.The BZV-NP-modified carbon paste electrode exhibited a superior specific capacit-ance of 714.15 F·g−1 with excellent cycling stability over 1000 cycles.The electrodes efficiently detected biomolecules such as ascorbic acid and uric acid,chemical drugs including paracetamol and ibuprofen,and heavy metals such as mercury,cobalt,and cadmium in the concentration range of 1-5 mM.The limit of detection(LOD)was measured for all analytes,and the electrode exhibited high sensitivity.These multifunctional properties render BZV promising material for energy storage and environmental monitoring applications. 展开更多
关键词 barium zinc vanadate acid black-52 photocatalytic activity supercapacitor sensor limit of detection
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Superiority of Strontium-Doped Barium Titanate as an Electron Transport for Perovskite Solar Cells for Enhanced Efficiency and Thermal Stability 认领 引用
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作者 Minhaz Mahmood Mohammad Tariqul Islam +7 位作者 Md Samiul Islam Sakhr M.Sultan Kashfia Noor M.A.Islam K.Sopian Abdullah Alghafis Mohd Adib Ibrahim K.Sobayel 《Transactions of Tianjin University》 EI CAS 2025年第1期42-63,共22页
This study presents a detailed comparative analysis of three electron transport layer(ETL)materials for perovskite solar cells(PSCs),namely titanium dioxide(TiO2),barium titanate(BaTiO3or BTO),and strontium-dope... This study presents a detailed comparative analysis of three electron transport layer(ETL)materials for perovskite solar cells(PSCs),namely titanium dioxide(TiO2),barium titanate(BaTiO3or BTO),and strontium-doped barium titan-ate(Ba1−xSrxTiO3or BST),and their impact on the quantum efficiency(QE)and power conversion efficiency(PCE)of CH3NH3PbI3(MAPbI3)PSCs.The optimized structure demonstrates that devices utilizing BST as an ETL achieved the highest PCE of 29.85%,exhibiting superior thermal stability with the lowest temperature coefficient of−0.43%/K.This temperature-induced degradation is comparable to that of commercially available silicon cells.Furthermore,BST-based ETLs show 29.50%and 26.48%higher PCE than those of TiO2-based and BTO-based ETLs.The enhanced internal QE and favorable current density–voltage(J–V)characteristics of BST compared with those of TiO2and BTO are attributed to its improved charge carrier separation,reduced recombination rates,and robust electrical characteristics under varied environmental conditions.Furthermore,the electric field and generation rate of the BST-based ETLs show a more favorable distribution than those of the TiO2-based and BTO-based ETLs.These findings provide significant insights into the role of different ETLs in enhancing QE,indicating that BST is a superior ETL that enhances both the efficiency and stability of PSCs.This study contributes to the understanding of how perovskite-structured ETLs can be used to design and optimize highly efficient and stable photovoltaic devices. 展开更多
关键词 Perovskite solar cell Electron transport layer Light management Quantum efficiency SCAPS-1D Lumerical FDTD Barium titanate
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Effect of Al-substitution on phase formation and magnetic properties of barium hexaferrite synthesized with sol-gel auto-combustion method 认领 引用 被引量：3
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作者 岳中岳 钟敏建 +1 位作者 马洪良 郭广磊 《Journal of Shanghai University(English Edition)》 2008年第3期216-220,共5页
Al-substituted barium ferrite powders were synthesized using the sol-gel auto-combustion method according to the molecular formula BaAlxFe12-xO19 （x=0, 0.1, 0.2, 0.3, 0.4, 0.5, 1.0）. Compared with non-substituted ba... Al-substituted barium ferrite powders were synthesized using the sol-gel auto-combustion method according to the molecular formula BaAlxFe12-xO19 （x=0, 0.1, 0.2, 0.3, 0.4, 0.5, 1.0）. Compared with non-substituted barium ferrite annealing at 1000 ℃, the vibrating sample magnetometer （VSM） measurement manifested that the optimum magnetic properties formation temperature of Al-substituted barium ferrite was 1 100 ℃. The data from X-ray diffractometer （XRD） showed that with increasing x, the lattice constants （a and c） decreased as well as the unit-cell volume Vcell. Magnetic measurement of non-substituted and Al-substituted powders annealed from 900 ℃ to 1 200 ℃ exhibited that the maximum magnetization M （10 kOe）, the remanent magnetization Mr and the coercivity Hc depended strongly on the chemical composition of powder as well as the annealing temperature. When annealing at 1 100 ℃, BaAl0.5Fe11.5O19 of high coercivity Hc （6584 Oe） was produced. Meanwhile, M （10 kOe） and Mr were 42.83 emu/g and 25.65 emu/g, respectively. 展开更多
关键词 Al-substituted barium ferrite non-substituted barium ferrite sol-gel auto-combustion magnetic properties
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Electromagnetic and microwave absorbing properties of W-type barium ferrite doped with Gd3+ 认领 引用 被引量：11
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作者 HUANG Xiaogu CHEN Jiao +1 位作者 WANG Lixi ZHANG Qitu 《Rare Metals》 SCIE EI CAS CSCD 2011年第1期44-48,共5页
W-type barium ferrites doped with Gd^3＋,Ba1-xGdx（Zn0.3Co0.7）2Fe16O27（x = 0,0.05,0.10,0.15,0.20）,were prepared by a sol-gel method.The effects of Gd^3＋ substitution on their microstructure,electromagnetic propert... W-type barium ferrites doped with Gd^3＋,Ba1-xGdx（Zn0.3Co0.7）2Fe16O27（x = 0,0.05,0.10,0.15,0.20）,were prepared by a sol-gel method.The effects of Gd^3＋ substitution on their microstructure,electromagnetic properties and microwave absorptive behavior were analyzed.The XRD patterns showed the single phase of W-type barium ferrite when x ≤ 0.15.Microwave electromagnetic properties of samples were studied at the frequency range from 2 GHz to 18 GHz using a network analyzer（Agilent 8722ET）.The complex permittivity ε（ε＇,ε＇＇） increased gradually when x ≤ 0.10,but it decreased as x = 0.15.The real permeability（μ＇） decreased with the increase of Gd^3＋ content,while the imaginary permeability（μ＇＇） increased when x ≤ 0.10.All these reasons were discussed using the electromagnetic theory.Furthermore,the ferrite-epoxy compound coating materials with 80 wt.% of Ba0.9Gd0.1（Zn0.3Co0.7）2Fe16O27 were prepared to measure the microwave absorbing properties.The maximum of reflection loss（RL） reached about-27 dB and RL was below-10 dB in the frequency range of 8-18 GHz when the thickness was 1.92 mm. 展开更多
关键词 nonmetallic material barium compounds ferrite sol-gel process materials properties doping
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Er3+-substituted W-type barium ferrite: preparation and electromagnetic properties 认领 引用 被引量：12
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作者 黄啸谷 张静 +3 位作者 王洪洲 闫绍腾 王丽熙 张其土 《Journal of Rare Earths》 SCIE EI CAS 2010年第6期940-943,共4页
Er3+-substituted W-type barium ferrites Ba1-xErx(Zn0.3Co0.7)2Fe16O27 (x=0.00, 0.05, 0.10, 0.15, 0.20) were synthesized by polymer adsorbent combustion method. Samples were characterized by X-ray diffraction analysis (... Er3+-substituted W-type barium ferrites Ba1-xErx(Zn0.3Co0.7)2Fe16O27 (x=0.00, 0.05, 0.10, 0.15, 0.20) were synthesized by polymer adsorbent combustion method. Samples were characterized by X-ray diffraction analysis (XRD), X-ray fluorescence (XRF), scanning electron microscopy (SEM) and network analyzer to investigate the relationships among Er3+ concentration, crystal structure, surface morphology and electromagnetic properties. All the XRD patterns showed pure phase of W-type barium ferrite when x≤0.15, while the impurity phase of ErFeO3 appeared when x=0.20. The pure W-type barium ferrite showed a hexagonal flake shape. In addition, the microwave electromagnetic properties of samples were analyzed in the frequency range of 2-18 GHz. It was indicated that the electromagnetic properties were significantly improved when Er3+ doping content was 0.10. The reasons were also discussed using electromagnetic theory. The optimized ferrite exhibited excellent microwave absorption performance. The maximum of reflection loss (RL) reached about-27.4 dB and RL was below-10 dB at the frequency range from 8.4 GHz to 18 GHz, when the thickness was 2.6 mm. 展开更多
关键词 W-type barium ferrite rare earth permittivity permeability microwave absorbing properties
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Highly enhanced microwave absorption for carbon nanotube/barium ferrite composite with ultra-low carbon nanotube loading 认领 引用 被引量：9
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作者 Yue-Yi Wang Song-Yang +3 位作者 Wen-Jin Sun Kun Dai Ding-Xiang Yan Zhong-Ming Li 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2022年第7期115-122,共8页
Barium ferrite(BaFe12O19)is considered as potential microwave absorption(MA)material thanks to the large saturation magnetization,high Curie temperature,and excellent chemical stability.The integration of carbon... Barium ferrite(BaFe12O19)is considered as potential microwave absorption(MA)material thanks to the large saturation magnetization,high Curie temperature,and excellent chemical stability.The integration of carbon nanotube(CNT)can improve the dielectric loss of BaFe12O19for further enhanced MA perfor-mance,nevertheless,the MA performance is still not desirable because of the poor CNT dispersion in the CNT/BaFe12O19composites,which usually prepared via the ball-milling method,unless high CNT loading was used.Herein,according to the thermal stability of CNT in different atmosphere and the formation mechanism of BaFe12O19from precursor,CNT was introduced in the precursor of BaFe12O19uniformly during auto-ignition process and calcined under different atmosphere.When CNT loading is only 2.0 wt%,the CNT/BaFe12O19composites obtained exhibits a minimum reflection loss(RLmin)of-43.9 dB and effective bandwidth(with RL<-10 dB)of 3.9 GHz with the thickness of 1.5 mm,which are much supe-rior to-10.2 dB and 2.2 GHz for pure BaFe12O19,and-13.6 dB and 2.5 GHz for CNT/BaFe12O19composite prepared by ball-milling method.These results may pave the way to design high-performance BaFe12O19based microwave absorbers. 展开更多
关键词 Carbon nanotube Barium ferrite Microwave absorption
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Efficiency of enhanced oil recovery by injection of low-salinity water in barium-containing carbonate reservoirs 认领 引用 被引量：5
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作者 Hyemin Park Yongjun Park +1 位作者 Yeonkyeong Lee Wonmo Sung 《Petroleum Science》 SCIE CAS CSCD 2018年第4期772-782,共11页
When low-salinity water containing sulfate ions is injected into carbonate reservoirs, rock dissolution and in situ precipitation occur, altering rock permeability and wettability. Particularly, when barium ions are p... When low-salinity water containing sulfate ions is injected into carbonate reservoirs, rock dissolution and in situ precipitation occur, altering rock permeability and wettability. Particularly, when barium ions are present in formation water,they react chemically with SO;, and BaSO;is precipitated. These reactions can cause a serious impact on the efficiency of enhanced oil recovery（EOR）. Therefore, the main purpose of this study was to identify EOR efficiency induced by lowsalinity waterflooding（LSWF） when Ba;is present in carbonate reservoirs. From the experimental results, it was confirmed that the permeability calculated by the measured pressure difference was improved because of rock dissolution predominating over in situ precipitation for the case of low Ba;concentrations. In the analysis of wettability alteration through the measurements of relative permeabilities before and after LSWF, the higher Ba;concentration case consumed more SO;in precipitating the BaSO;, resulting in weaker wettability alteration due to the reduction of sulfate activity.These phenomena ultimately influenced EOR efficiency, i.e., the oil recovery was greater for the lower Ba;concentration. 展开更多
关键词 Low-salinity water flooding Barium Sulfate Oil recovery Carbonate
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Influence of La-Co substitution on the structure and magnetic properties of low-temperature sintered M-type barium ferrites 认领 引用 被引量：4
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作者 李颉 张怀武 +2 位作者 李强 李元勋 郁国良 《Journal of Rare Earths》 SCIE EI CAS CSCD 2013年第10期983-987,共5页
La-Co substituted M-type barium ferrites （BaM） were prepared by traditional solid state method and sintered at low tem- perature （1173 K）. X-ray diffraction （XRD）, scanning electron microscopy （SEM） and vibrat... La-Co substituted M-type barium ferrites （BaM） were prepared by traditional solid state method and sintered at low tem- perature （1173 K）. X-ray diffraction （XRD）, scanning electron microscopy （SEM） and vibrating sample magnetometer （VSM） were employed to investigate the influence of La-Co on the structure and magnetic properties of the samples. By sintering at 1173 K for 6 h in air, single phase M-type barium ferrites with chemical composition of Ba（LaCo）xFel〉z^Oj9 （x=0.0~）.5） were formed. M-H curves showed that the magnetic properties of barium ferrites were obviously effected by La-Co substitution. The saturation magnetization （Ms） and coercivity （He） reached the maximum value of 65.15 AmZ/kg and 4165 Oe, respectively. This behavior was attributed to the sites of La-Co substitutions and the particles size. SEM revealed that the shape of ferrite particles was influenced by La-Co substitution. 展开更多
关键词 M-type barium fenites La-Co substitution magnetic properties rare earths
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Optimized growth and dielectric properties of barium titanate thin films on polycrystalline Ni foils 认领 引用 被引量：9
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作者 梁伟正 吉彦达 +5 位作者 南天翔 黄江 曾慧中 杜辉 陈充林 林媛 《Chinese Physics B》 SCIE EI CAS CSCD 2012年第6期498-503,共6页
Barium titanate（BTO） thin films were deposited on polycrystalline Ni foils by using the polymer assisted deposition（PAD） technique.The growth conditions including ambient and annealing temperatures were carefully ... Barium titanate（BTO） thin films were deposited on polycrystalline Ni foils by using the polymer assisted deposition（PAD） technique.The growth conditions including ambient and annealing temperatures were carefully optimized based on thermal dynamic analysis to control the oxidation processing and interdiffusion.Crystal structures,surface morphologies,and dielectric performance were examined and compared for BTO thin films annealed under different temperatures.Correlations between the fabrication conditions,microstructures,and dielectric properties were discussed.BTO thin films fabricated under the optimized conditions show good crystalline structure and promising dielectric properties with εr～ 400 and tan δ 〈 0.025 at 100 kHz.The data demonstrate that BTO films grown on polycrystalline Ni substrates by PAD are promising in device applications. 展开更多
关键词 polymer assisted deposition barium titanate nickel foils thin films thermodynamics,dielectric properties
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Steam reforming of acetic acid over Ni-Ba/Al2O3 catalysts:Impacts of barium addition on coking behaviors and formation of reaction intermediates 认领 引用 被引量：5
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作者 Zhanming Zhang Yiran Wang +7 位作者 Kai Sun Yuewen Shao Lijun Zhang Shu Zhang Xiao Zhang Qing Liu Zhenhua Chen Xun Hu 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2020年第4期208-219,共12页
The influence of barium addition to a Ni/Al2O3 catalyst on the reaction intermediates formed,the activity,resistance of the catalyst to coking,and properties of the coke formed after acetic acid steam reforming were i... The influence of barium addition to a Ni/Al2O3 catalyst on the reaction intermediates formed,the activity,resistance of the catalyst to coking,and properties of the coke formed after acetic acid steam reforming were investigated in this study.The results showed the drastic effects of barium addition on the physicochemical properties and performances of the catalyst.The solid-phase reaction between alumina and BaO formed BaAl2O4,which re-constructed the alumina structure,resulting in a decrease in the specific surface area and an increase in the resistance of metallic Ni to sintering.The addition of barium was also beneficial for enhancing the catalytic activity,resulting from the changed catalytic reaction network.The in-situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) study of the acetic acid steam reforming indicated that barium could effectively suppress the accumulation of the reaction intermediates of carbonyl,formate,and C=C functional groups on the catalyst surface,attributed to its relatively high ability to cause the gasification of these species.In addition,coking was considerably more significant over the Ba-Ni/Al2O3 catalyst.Moreover,the Ba-Ni/Al2O3 catalyst was more stable than the Ni/Al2O3catalyst,owing to the distinct forms of coke formed (carbon nanotube form over the Ba-Ni/Al2O3 catalyst,and the amorphous form over the Ni/Al2O3 catalyst). 展开更多
关键词 Barium addition Nickel-based catalysts Steam reforming of acetic acid Reaction intermediates Coking behaviors
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Effect of barium and potassium promoter on Co/CeO_2 catalysts in ammonia synthesis 认领 引用 被引量：3
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作者 Bingyu Lin Yi Liu +3 位作者 Lan Heng Jun Ni Jianxin Lin Lilong Jiang 《Journal of Rare Earths》 SCIE EI CAS CSCD 2018年第7期703-707,共5页
The Co/CeO2 catalysts promoted with Ba or K were prepared to study the effect of promoter on the catalytic performance of ammonia synthesis. The results show that the presence of Ba or K promoter changes the propertie... The Co/CeO2 catalysts promoted with Ba or K were prepared to study the effect of promoter on the catalytic performance of ammonia synthesis. The results show that the presence of Ba or K promoter changes the properties of CeO2-supported Co catalysts including the surface area, the crystallite size and the morphology of CeO2, the reduction degree of cobalt species and the adsorption performance of hydrogen and nitrogen. As a consequence, the samples promoted with an appropriate amount of Ba show higher ammonia synthesis rates, while the catalysts with high Ba loading or K promoter all exhibit low catalytic activities. 展开更多
关键词 Promoter Co/CeO2 catalyst Ammonia synthesis Barium Potassium Rare earths
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Layered barium vanadate nanobelts for high-performance aqueous zinc-ion batteries 认领 引用 被引量：8
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作者 Xing-hua Qin Ye-hong Du +4 位作者 Peng-chao Zhang Xin-yu Wang Qiong-qiong Lu Ai-kai Yang Jun-cai Sun 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2021年第10期1684-1692,共9页
Aqueous zinc-ion batteries(ZIBs)are deemed as the idea option for large-scale energy storage systems owing to many alluring merits including low manufacture cost,environmental friendliness,and high operations safety.H... Aqueous zinc-ion batteries(ZIBs)are deemed as the idea option for large-scale energy storage systems owing to many alluring merits including low manufacture cost,environmental friendliness,and high operations safety.However,to develop high-performance cathode is still significant for practical application of ZIBs.Herein,Ba0.23V2O5·1.1H2O(BaVO)nanobelts were fabricated as cathode materials of ZIBs by a typical hydrothermal synthesis method.Benefiting from the increased interlayer distance of 1.31 nm by Ba2+ and H2O pre-intercalated,the obtained BaVO nanobelts showed an excellent initial discharge capacity of 378 mAh·g-1 at 0.1 A·g-1,a great rate performance(e.g.,172 mAh·g-1 at 5 A·g-1),and a superior capacity retention(93% after 2000 cycles at 5 A·g-1). 展开更多
关键词 aqueous zinc-ion batteries barium vanadate nanobelts increased interlayer distance long cycle life
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Dopant Behaviours of Sm_2O_3 on Microstructure and Properties of Barium Zirconium Titanate Ceramics 认领 引用 被引量：4
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作者 王永力 李龙土 +1 位作者 齐建全 桂治轮 《Journal of Rare Earths》 SCIE EI CAS 2001年第4期266-270,共5页
The effect of Sm 2O 3 dopant on the sintering characteristics and dielectric properties of barium zirconium titanate ceramics (BaZr x Ti 1- x O 3) was investigated. It is shown that trace amount of Sm 2O 3 can greatly... The effect of Sm 2O 3 dopant on the sintering characteristics and dielectric properties of barium zirconium titanate ceramics (BaZr x Ti 1- x O 3) was investigated. It is shown that trace amount of Sm 2O 3 can greatly affect the grain growth and densification of barium zirconium titanate ceramics during sintering. At the same time, the dielectric peak at high temperature shifts to lower temperature and that at low temperature shifts to higher temperature. The two dielectric peaks overlap with each other when the Sm 2O 3 dopant content varies from 0 25% to 1%, and the maximum relative dielectric constant is greatly enhanced. These effects may be attributed to the substitution actions of the rare earth element in perovskite lattice. At the doping content of 0 75%, the dielectric constant maximum of 23570 can be obtained. By adopting some proper additives, an excellent Y5V dielective material is obtained, and the room temperature properties are as follows: relative dielectric constant ε RT ≥23,000, dielectric loss tgδ≤0 0075 and the breakdown strength under alternating field E b≥5 kV·mm -1 . 展开更多
关键词 rare earths barium zirconium titanate high voltage ceramic capacitors dielectric properties
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A New 2D Layered Barium Coordination Polymer [Ba(3-NPA)]_n: Synthesis, Crystal Structure, Thermal Stability and Luminescent Properties 认领 引用 被引量：5
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作者 汪鹏飞 陶筱林 +2 位作者 汪金玲 吴国志 汪新 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 2014年第3期339-344,共6页
A new two-dimensional （2D） barium（AA） coordination polymer [Ba（3-NPA）]n （1） has been obtained by the hydro/solvothermal reaction of the corresponding metal salt with 3-nitrophthalic acid （3-NPAH2）. Compound ... A new two-dimensional （2D） barium（AA） coordination polymer [Ba（3-NPA）]n （1） has been obtained by the hydro/solvothermal reaction of the corresponding metal salt with 3-nitrophthalic acid （3-NPAH2）. Compound 1 was characterized by infrared spectrum, elemental analysis, powder X-ray diffraction （PXRD） and single-crystal X-ray diffraction analysis. Compound 1 crystallizes in triclinic, space group Pī with a = 4.9611（3）, b = 7.2599（4）, c = 12.9463（8） A, α = 89.0892（2）, β = 80.546（2）, γ = 73.211（2）°, V = 440.1（5） A3, Z = 2, C8H3BaNO6, Mr = 346.45, Dc = 2.614 g·cm^-3, μ = 4.526 mm^-1, S = 1.035, F（000） = 324, R = 0.0168 and wR = 0.0471 for 1712 observed reflections with I 〉 2σ（I）. （Aρ）max = 0.458, （Aρ）min = -0.565 e·A-3 and （A/σ）max = 0.001. In compound 1, each 3-NPA^2- ligand links six Ba（II） ions and each Ba（II） ion attaches to six 3-NPA^2- ligands to form an inorganic layer structure in the ab-plane. The phenyl groups of 3-NPA^2- ligands are grafted on the two sides of the inorganic layer, resulting in a two-dimensional （2D） layered structure. Furthermore, the thermal stability and luminescent properties of compound 1 have also been investigated in detail. 展开更多
关键词 barium（II） compound crystal structure multicarboxylate ligand luminescence
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