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Host-dependent Eu2+/Eu3+co-luminescence and excitation-tunable multicolor emission of Eu-doped Ae F2(Ae=Ca,Sr,Ba,Ca0.5Sr0.5,Ca0.33Sr0.33Ba0.33)single crystals 认领 引用
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作者 Xiaobo Huang Ying Quan +4 位作者 Wudi Wang Qingguo Wang Xiaodong Xu Huili Tang Jun Xu 《Chinese Physics B》 SCIE EI CAS CSCD 2026年第4期614-622,共9页
This study successfully grew a series of mixed-valence Eu2+/Eu3+co-activated alkaline-earth fluoride single crystals(CaF2,SrF2,BaF2,Ca0.5Sr0.5F2,and the medium-entropy Ca0.33Sr0.33Ba_(0.3... This study successfully grew a series of mixed-valence Eu2+/Eu3+co-activated alkaline-earth fluoride single crystals(CaF2,SrF2,BaF2,Ca0.5Sr0.5F2,and the medium-entropy Ca0.33Sr0.33Ba0.33F2)using the vertical Bridgman method.During the high-temperature growth process,Eu3+undergoes spontaneous reduction to form Eu2+.X-ray photoelectron spectroscopy(XPS)confirmed the coexistence of both valence states,and their relative ratio exhibits a strong host-dependence;for instance,Eu2+is predominant in SrF2,while Eu3+is dominant in BaF2.Under ultraviolet excitation,all crystals simultaneously exhibit the broadband emission of Eu2+(400-550 nm)and the narrow-line emission of Eu3+(585-710 nm).The Eu2+emission peak systematically red-shifts from 440 nm in CaF2to 485 nm in BaF2as the host cation radius increases.Efficient resonant energy transfer from Eu2+to Eu3+is evidenced by spectral overlap and opposing fluorescence lifetime trends.By controlling the host's composition,the emission chromaticity of the crystals can be continuously tuned from the deep-blue of CaF2(0.1720,0.0382)to the warm-white of BaF2(0.4135,0.3516)under 299 nm excitation.Notably,the medium-entropy Eu:Ca0.33Sr0.33Ba0.33F2crystal can achieve a shift in emission tone from neutral white to warm white simply by changing the excitation wavelength.These findings provide a new design strategy for developing single-activator,wide-gamut,tunable luminescent materials for next-generation solid-state lighting and display technologies. 展开更多
关键词 matrix effect Eu2+/Eu3+ energy transfer multicolor emission Eu:Ae F2crystals
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Nonlinear health evaluation for lithium-ion battery within full-lifespan 认领 引用 被引量：16
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作者 Heze You Jiangong Zhu +10 位作者 Xueyuan Wang Bo Jiang Hao Sun Xinhua Liu Xuezhe Wei Guangshuai Han Shicong Ding Hanqing Yu Weihan Li Dirk Uwe Sauer Haifeng Dai 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2022年第9期333-341,I0010,共9页
Lithium-ion batteries(LIBs), as the first choice for green batteries, have been widely used in energy storage, electric vehicles, 3C devices, and other related fields, and will have greater application prospects in th... Lithium-ion batteries(LIBs), as the first choice for green batteries, have been widely used in energy storage, electric vehicles, 3C devices, and other related fields, and will have greater application prospects in the future. However, one of the obstacles hindering the future development of battery technology is how to accurately evaluate and monitor battery health, which affects the entire lifespan of battery use. It is not enough to assess battery health comprehensively through the state of health(SoH) alone, especially when nonlinear aging occurs in onboard applications. Here, for the first time, we propose a brand-new health evaluation indicator—state of nonlinear aging(SoNA) to explain the nonlinear aging phenomenon that occurs during the battery use, and also design a knee-point identification method and two SoNA quantitative methods. We apply our health evaluation indicator to build a complete LIB full-lifespan grading evaluation system and a ground-to-cloud service framework, which integrates multi-scenario data collection, multi-dimensional data-based grading evaluation, and cloud management functions. Our works fill the gap in the LIBs’ health evaluation of nonlinear aging, which is of great significance for the health and safety evaluation of LIBs in the field of echelon utilization such as vehicles and energy storage. In addition, this comprehensive evaluation system and service framework are expected to be extended to other battery material systems other than LIBs, yet guiding the design of new energy ecosystem. 展开更多
关键词 Lithium-ion battery State of nonlinear aging Knee-point Grading evaluation system Echelon utilization
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Crystal growth, spectroscopic characteristics, and Judd–Ofelt analysis of Dy:Lu_2O_3 for yellow laser 认领 引用 被引量：5
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作者 Jiaojiao Shi Bin Liu +8 位作者 Qingguo Wang Huili Tang Feng Wu Dongzhen Li Hengyu Zhao Zhanshan Wang Wen Deng Xiaodong Xu Jun Xu 《Chinese Physics B》 SCIE EI CAS CSCD 2018年第7期531-535,共5页
Dy：Lu2O3 was grown by the float-zone （Fz） method. According to the absorption spectrum, the Judd-Ofelt （JO） parameters Ω2, Ω4, and Ω6 were calculated to be 4.86 × 10-20 cm2, 2.02 × 10-20 cm2, and 1.7... Dy：Lu2O3 was grown by the float-zone （Fz） method. According to the absorption spectrum, the Judd-Ofelt （JO） parameters Ω2, Ω4, and Ω6 were calculated to be 4.86 × 10-20 cm2, 2.02 × 10-20 cm2, and 1.76 ×10-20 cm2, respectively. The emission cross-section at 574 nm corresponding to the 4F9/2 →6H13/2 transition was calculated to be 0.53 ×10 20 cm2. The yellow （4F9/2 →6H13/2 transition） to blue （4F9/2 →6H15/2 transition） intensity ratio ranges up to 12.9. The fluorescence lifetime of the 4F9/2 energy level was measured to be 112.1 μs. These results reveal that Dy：Lu2O3 is a promising material for use in yellow lasers. 展开更多
关键词 fluorescence spectra laser materials excited states
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Diode-pumped laser performance of Tm:Sc2SiO5 crystal at 1971 nm 认领 引用
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作者 刘斌 郑丽和 +16 位作者 王庆国 刘军芳 苏良碧 唐慧丽 刘杰 范秀伟 吴锋 罗平 赵衡煜 施佼佼 何诺天 李纳 李秋 郭超 徐晓东 王占山 徐军 《Chinese Physics B》 SCIE EI CAS CSCD 2017年第8期189-192,共4页
The 4-at.% Tm：Sc_2SiO_5 （Tm：SSO） crystal is successfully obtained by the Czochralski method. The optical properties and thermal conductivity of the crystal are investigated. The broad continuous wave（CW） laser o... The 4-at.% Tm：Sc_2SiO_5 （Tm：SSO） crystal is successfully obtained by the Czochralski method. The optical properties and thermal conductivity of the crystal are investigated. The broad continuous wave（CW） laser output of（100）-cut Tm：SSO with the dimensions of 3 mm×3 mm×3 mm under laser diode（LD）-pumping is realized. The full width at half maximum（FWHM） of the laser emitting reaches up to 21 nm. The laser threshold of Tm：SSO is measured to be 0.43 W. Efficient diode-pumped CW laser performance of Tm：SSO is demonstrated with a slope efficiency of 25.9% and maximum output power of 934 mW. 展开更多
关键词 diode-pumped lasers laser materials crystal growth
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Biodegradable Polypeptide-based Vesicles with Intrinsic Blue Fluorescence for Antibacterial Visualization 认领 引用 被引量：7
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作者 Yu-Ying Yang Ling-Shan Chen +3 位作者 Min Sun Cong-Yu Wang Zhen Fan Jian-Zhong Du 《Chinese Journal of Polymer Science》 SCIE EI CAS CSCD 2021年第11期1412-1420,共9页
Fluorescence imaging has been an indispensable tool to provide dynamic information about the localization and quantity of organisms.Meanwhile,due to the intrinsic hollow structure and modularized biofunctionalities,po... Fluorescence imaging has been an indispensable tool to provide dynamic information about the localization and quantity of organisms.Meanwhile,due to the intrinsic hollow structure and modularized biofunctionalities,polymer vesicles have been widely applied in biomedical field.However,most polymer vesicles are embedded with organic fluorophores for fluorescence imaging,which have certain drawbacks such as leakage and possible cytotoxicity.Here,we present a biodegradable polypeptide-based vesicle with intrinsic blue fluorescence without introducing any fluorophore for real-time visualization of antibacterial process.Through modular design to integrate multiple functional fragments,poly(ε-caprolactone)-block-poly(tryptophan)-block-poly(lysine-stat-phenylalanine)[PCL25-b-PTrp2-b-P(Lys13-statPhe4)]was synthesized,where PCL chains form the hydrophobic membrane,P(Lys-stat-Phe)and PTrp provide intrinsic fluorescence and broadspectrum antibacterial activity.It is noteworthy that the fluorescence emission was shifted from invisible ultraviolet range of amino acids to visible range(emission maximum at 436 nm),which makes it possible to visualize the antibacterial process.In addition,through utilizing the intrinsic fluorescence of vesicles,confocal fluorescent imaging of vesicles with bacteria validated the specific adhesion of vesicle towards bacteria,and the bacterial death through membrane disruption.Overall,we provided a novel approach to developing biodegradable fluorescent polypeptide-based vesicles for real-time visualization of antibacterial process. 展开更多
关键词 Polypeptide-based vesicles Intrinsic fluorescence Antibacterial visualization
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Recent progress onmicrofluidic devices with incorporated 1D nanostructures for enhanced extracellular vesicle(EV)separation 认领 引用 被引量：2
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作者 Yuting Xiong Hanyue Kang +2 位作者 Hongzhao Zhou Liang Ma Xiaobin Xu 《Bio-Design and Manufacturing》 SCIE EI CAS CSCD 2022年第3期607-616,共10页
Extracellular vesicles(EVs)are lipid-bound vesicles secreted by cells into the extracellular space.There are three types of EVs,including exosomes(30–150 nm)[1],microvesicles(100–1000 nm),and apoptotic bodies(50–40... Extracellular vesicles(EVs)are lipid-bound vesicles secreted by cells into the extracellular space.There are three types of EVs,including exosomes(30–150 nm)[1],microvesicles(100–1000 nm),and apoptotic bodies(50–4000 nm).EVs are also important intercellular communication carriers in many physiological and pathological processes such as immune response,tumor invasion,and metastasis[2,3].EVs circulate in various body fluids(e.g.,peripheral blood and urine),while carrying genetic information(e.g.,proteins and nucleic acids)from the parent cells[2,4,5].Thus,their source can be identified through gene analysis[6–10]. 展开更多
关键词 invasion urine metastasis
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Effects of Zr4+and Hf4+co-doping on luminescence and scintillation properties of LuYAG:Pr3+single crystals grown by micro-pulling-down technique 认领 引用 被引量：2
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作者 Yufeng Tong Yunyun Li +6 位作者 Qingsong Song Jie Xu Xiaodong Xu Mikhail Korzhik Jun Xu Kheirreddine Lebbou Yuntao Wu 《Journal of Rare Earths》 SCIE EI CAS CSCD 2025年第4期701-706,I0003,共6页
In this study,we aim to clarify the luminescence and scintillation performance of 0.2 at%Pr3+-doped LuYAG scintillators with either zirconium or hafnium co-doping obtained using the micro-pulling-down(μ-PD)method.... In this study,we aim to clarify the luminescence and scintillation performance of 0.2 at%Pr3+-doped LuYAG scintillators with either zirconium or hafnium co-doping obtained using the micro-pulling-down(μ-PD)method.Under radiation excitation,scintillation properties such as light yield,decay time,and afterglow level were measured and compared to non-co-doped LuYAG:Pr3+.The positive effect of Zr and Hf co-doping is to significantly shorten the scintillation time response.The negative effect is the decrease of scintillation yield and increase of afterglow.We propose that the positively charged defects induced by Zr/Hf co-doping are responsible for the spatial correlated traps around Pr centers causing the shortened scintillation decay via non-radiative recombination processes,and the deep traps as well for the prolonged afterglow. 展开更多
关键词 LuYAG:Pr Scintillators Co-doping Zirconium Hafnium μ-PD
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Research on the impact of high-temperature aging on the thermal safety of lithium-ion batteries 认领 引用 被引量：14
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作者 Guangxu Zhang Xuezhe Wei +5 位作者 Siqi Chen Gang Wei Jiangong Zhu Xueyuan Wang Guangshuai Han Haifeng Dai 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2023年第12期378-389,I0010,共12页
Understanding the thermal safety evolution of lithium-ion batteries during high-temperature usage conditions bears significant implications for enhancing the safety management of aging batteries.This work investigates... Understanding the thermal safety evolution of lithium-ion batteries during high-temperature usage conditions bears significant implications for enhancing the safety management of aging batteries.This work investigates the thermal safety evolution mechanism of lithium-ion batteries during high-temperature aging.Similarities arise in the thermal safety evolution and degradation mechanisms for lithium-ion batteries undergoing cyclic aging and calendar aging.Employing multi-angle characterization analysis,the intricate mechanism governing the thermal safety evolution of lithium-ion batteries during high-temperature aging is clarified.Specifically,lithium plating serves as the pivotal factor contributing to the reduction in the self-heating initial temperature.Additionally,the crystal structure of the cathode induced by the dissolution of transition metals and the reductive gas generated during aging attacking the crystal structure of the cathode lead to a decrease in thermal runaway triggering temperature.Furthermore,the loss of active materials and active lithium during aging contributes to a decline in both the maximum temperature and the maximum temperature rise rate,ultimately indicating a decrease in the thermal hazards of aging batteries. 展开更多
关键词 Lithium-ion batteries High-temperature aging Thermal safety Degradation Lithium plating
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The application of biomacromolecules to improve oral absorption by enhanced intestinal permeability:A mini-review 认领 引用 被引量：6
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作者 Min Sun Hankun Hu +1 位作者 Leming Sun Zhen Fan 《Chinese Chemical Letters》 SCIE CAS CSCD 2020年第7期1729-1736,共8页
Oral administration has been widely regarded as the most conve nient,quick and safe approach compared to other routes of drug delivery.However,oral absorption of drugs is often limited due to rigorous environments and... Oral administration has been widely regarded as the most conve nient,quick and safe approach compared to other routes of drug delivery.However,oral absorption of drugs is often limited due to rigorous environments and complex obstacles in gastrointestinal tract.Having received considerable attention,biomacromolecules have been applied for oral drug delivery to improve the bioavailability,which could be attributed to its stability and unique bioactivities,including intestinal adhesion,opening of epithelial tight junctions,inhibiting cell efflux and regulating relative protein expression.Specifically,enhancing intestinal permeability has been regarded as a promising strategy for improving bioavailability of oral drug delivery.In this review,a series of biomacromolecules and the related mechanisms of increasing intestinal permeability for enhanced oral bioavailability are comprehensively classified and elucidated.In addition,recent advances in biomacromolecules based oral delivery and related future directions are mentioned and predicted in this review article. 展开更多
关键词 Biomacromolecules Intestinal permeability Oral administration Transported ratio Delivery barriers
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Growth and physical characterization of high resistivityFe:β-Ga2O3 crystals 认领 引用 被引量：6
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作者 Hao Zhang Hui-Li Tang +4 位作者 Nuo-Tian He Zhi-Chao Zhu Jia-Wen Chen Bo Liu Jun Xu 《Chinese Physics B》 SCIE EI CAS CSCD 2020年第8期424-427,共4页
High quality 0.02 mol%,0.05 mol%,and 0.08 mol%Fe:β-Ga2O3 single crystals were grown by the floating zone method.The crystal structure,optical,electrical,and thermal properties were measured and discussed.Fe:β-Ga2O3 ... High quality 0.02 mol%,0.05 mol%,and 0.08 mol%Fe:β-Ga2O3 single crystals were grown by the floating zone method.The crystal structure,optical,electrical,and thermal properties were measured and discussed.Fe:β-Ga2O3 single crystals showed transmittance of higher than 80%in the near infrared region.With the increase of the Fe doping concentration,the optical bandgaps reduced and room temperature resistivity increased.The resistivity of 0.08 mol%Fe:β-Ga2O3 crystal reached to 3.63×1011Ω·cm.The high resistivity Fe:β-Ga2O3 single crystals could be applied as the substrate for the high-power field effect transistors(FETs). 展开更多
关键词 Fe:β-Ga2O3 crystal high resistivity crystal growth
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Passively Mode-Locked Femtosecond Disordered Crystal Laser with Nd:CGA as Gain Medium 认领 引用 被引量：2
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作者 何坤娜 刘家兴 +8 位作者 田文龙 沈忠伟 徐晓东 王兆华 李德华 徐军 狄聚青 夏长泰 魏志义 《Chinese Physics Letters》 SCIE EI CAS CSCD 2016年第9期52-55,共4页
We present a laser-diode-pumped passively mode-locked femtosecond disordered crystal laser by using Nd：CaGdAI04 （Nd：CGA） as the gain medium. With a pair of SF6 prisms to control the dispersion compensation, laser ... We present a laser-diode-pumped passively mode-locked femtosecond disordered crystal laser by using Nd：CaGdAI04 （Nd：CGA） as the gain medium. With a pair of SF6 prisms to control the dispersion compensation, laser pulses as short as 850fs at 1079nm are obtained with a repetition rate of 124.6 MHz. The measured threshold pump power is 1.45 W. A maximum average output power of 122mW is obtained under the pump power of 5.9 W. These results show that Nd：CGA could be a promising laser medium for generating femtosecond ultrashort pulse at about 1 μm. 展开更多
关键词 Nd CGA in is of mode Passively Mode-Locked Femtosecond Disordered Crystal Laser with Nd:CGA as Gain Medium with
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Spectra properties of Yb3+,Er3+:Sc_2SiO_5 crystal 认领 引用 被引量：1
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作者 Yanyan Xue Lihe Zheng +3 位作者 Dapeng Jiang Qinglin Sai Liangbi Su Jun Xu 《Chinese Physics B》 SCIE EI CAS CSCD 2019年第3期362-365,共4页
The influence of Er3+ ions on the spectra of Yb3+,Er3+: Sc_2 SiO_5(SSO) single crystal, which was obtained by Czochralski(Cz) method, is discussed. The absorption coefficient at 980 nm was 13.36 cm-1 with a p... The influence of Er3+ ions on the spectra of Yb3+,Er3+: Sc_2 SiO_5(SSO) single crystal, which was obtained by Czochralski(Cz) method, is discussed. The absorption coefficient at 980 nm was 13.36 cm-1 with a peak absorption cross-section of 1.46 × 10-20 cm2. The emission cross-sections at 1034 nm and 1062 nm were 5.5 × 10-21 cm^2 and4.9 × 10-21 cm^2, respectively. The fluorescence lifetime was estimated as 1.24 ms at 1061 nm. The mechanical properties of SSO single crystal were also presented. 展开更多
关键词 Yb3+ Er3+: Sc2SiO5 spectra properties mechanical properties
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Crystal growth and spectral properties of Tb:Lu2O3 认领 引用 被引量：1
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作者 Jiaojiao Shi Bin Liu +10 位作者 Qingguo Wang Huili Tang Feng Wu Dongzhen Li Hengyu Zhao Zhanshan Wangl, Wen Deng Zian Xu Jiayue Xu Xiaodong Xu Jun Xu 《Chinese Physics B》 SCIE EI CAS CSCD 2018年第9期590-594,共5页
The crystal growth,x-ray diffraction pattern,absorption spectrum,emission spectrum,and fluorescence lifetime of a Tb：Lu2O3 single crystal were studied.Excited at 483 nm,the peak absorption cross-section was calculate... The crystal growth,x-ray diffraction pattern,absorption spectrum,emission spectrum,and fluorescence lifetime of a Tb：Lu2O3 single crystal were studied.Excited at 483 nm,the peak absorption cross-section was calculated to be 3.5×10（-22）cm2,and the full width at half maximum was found to be 2.85 nm.The Judd-Ofelt（J-O）intensity parameters 2,4,and 6 were computed to be 3.79×10（-20）cm2,1.30×10（-20）cm2,and 1.08×10（-20）cm2,with a spectroscopic quality factor 4/6 being 1.20.The emission cross-sections of green emission around 543 nm and yellow emission around 584 nm were calculated to be 9.43×10（-22）cm2 and 1.32×10（-22）cm2,respectively.The fluorescence lifetimeτexp of -5D4 was fitted to be 1.13 ms.The data suggest that the Tb：Lu2O3 crystal could be a potential candidate for green and yellow laser operation. 展开更多
关键词 fluorescence spectra laser materials excited states
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Thermal conductivity of nanowires 认领 引用 被引量：2
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作者 Zhongwei Zhang Jie Chen 《Chinese Physics B》 SCIE EI CAS CSCD 2018年第3期20-32,共13页
Thermal conductivity of nanowires(NWs)is a crucial criterion to assess the operating performance of NWs-based device applications,such as in the field of heat dissipation,thermal management,and thermoelectrics.Therefo... Thermal conductivity of nanowires(NWs)is a crucial criterion to assess the operating performance of NWs-based device applications,such as in the field of heat dissipation,thermal management,and thermoelectrics.Therefore,numerous research interests have been focused on controlling and manipulating thermal conductivity of one-dimensional materials in the past decade.In this review,we summarize the state-of-the-art research status on thermal conductivity of NWs from both experimental and theoretical studies.Various NWs are included,such as Si,Ge,Bi,Ti,Cu,Ag,Bi2Te3,ZnO,AgTe,and their hybrids.First,several important size effects on thermal conductivity of NWs are discussed,such as the length,diameter,orientation,and cross-section.Then,we introduce diverse nanostructuring pathways to control the phonons and thermal transport in NWs,such as alloy,superlattices,core-shell structure,porous structure,resonant structure,and kinked structure.Distinct thermal transport behaviors and the associated underlying physical mechanisms are presented.Finally,we outline the important potential applications of NWs in the fields of thermoelectrics and thermal management,and provide an outlook. 展开更多
关键词 thermal conductivity nanowires thermal management thermoelectrics
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Spectral properties of Pr:CNGG crystals grown by micro-pulling-down method 认领 引用
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作者 Yan-Yan Xue Na Li +7 位作者 Dong-Hua Hu Qing-Song Song Xiao-Dong Xu Dong-Hai Wang Qing-Guo Wang Dong-Zhen Li Zhan-Shan Wang Jun Xu 《Chinese Physics B》 SCIE EI CAS CSCD 2019年第8期345-348,共4页
Pr^3+-doped calcium niobium gallium garnet(Pr:CNGG)single crystals with different Pr^3+concentrations are successfully grown by the micro-pulling-down(μ-PD)method.The crystal structure,room-temperature absorption spe... Pr^3+-doped calcium niobium gallium garnet(Pr:CNGG)single crystals with different Pr^3+concentrations are successfully grown by the micro-pulling-down(μ-PD)method.The crystal structure,room-temperature absorption spectra,and fluorescence spectra of Pr:CNGG crystals are measured and discussed.The fluorescence results indicate their large dependence on the doping concentration.The fluorescence lifetime of the 1D2 energy level is also determined.The results indicate that Pr:CNGG crystal could be a potential solid-state laser gain medium. 展开更多
关键词 Pr:CNGG μ-PD method spectral properties
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Crystal growth,spectral properties and Judd-Ofelt analysis of Pr:CaF2-YF3 认领 引用
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作者 Jie Tian Xiao Cao +7 位作者 Wudi Wang Jian Liu Jianshu Dong Donghua Hu Qingguo Wang Yanyan Xue Xiaodong Xu Jun Xu 《Chinese Physics B》 SCIE EI CAS CSCD 2021年第10期624-629,共6页
The 0.6 at.%Pr3+-doped CaF2-YF3crystal was successfully grown by the temperature gradient technique(TGT).X-ray diffraction analysis showed that the grown crystal still had cubic structure.The absorption spect... The 0.6 at.%Pr3+-doped CaF2-YF3crystal was successfully grown by the temperature gradient technique(TGT).X-ray diffraction analysis showed that the grown crystal still had cubic structure.The absorption spectrum,emission spectrum,Judd-Ofelt analysis and fluorescence decay curve at room temperature were discussed.The fluorescence lifetime of Pr:CaF2-YF3crystal was 45.46µs,and theσem·τof 3P0→3H6 and 3P0→3F2 transitions were calculated to be 80.92×10−20 cm2·µs and 388.7×10−20 cm2·µs,respectively.The FWHMs are 20.1 nm and 6.8 nm,which are higher than those of Pr:LiYF4,Pr:LiLuF4,Pr:LiGdF4 and Pr:BaY2F8 crystals.The results show that the Pr:CaF2-YF3crystal is expected to achieve 605 nm orange light and 642 nm red light laser operation. 展开更多
关键词 CaF2-YF3 crystal growth spectral property Judd-Ofelt theory
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FerroAI:a deep learning model for predicting phase diagrams of ferroelectric materials 认领 引用 被引量：2
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作者 Chenbo Zhang Xian Chen 《npj Computational Materials》 SCIE EI CSCD 2025年第1期3054-3062,共9页
Composition-temperature phase diagrams are crucial for designing ferroelectric materials,however predicting them accurately remains challenging due to limited phase transformation data and the constraints of conventio... Composition-temperature phase diagrams are crucial for designing ferroelectric materials,however predicting them accurately remains challenging due to limited phase transformation data and the constraints of conventional methods.Here,we utilize natural language processing(NLP)to text-mine 41,597 research articles,compiling a dataset of 2838 phase transformations across 846 ferroelectric materials.Leveraging this dataset,we develop FerroAI,a deep learning model for phase diagram prediction.FerroAI successfully predicts phase boundaries and transformations among different crystal symmetries in Ce/Zr co-doped BaTiO3(BT)-xBa0.7Ca0.3TiO3(BCT).It also identifies a morphotropic phase boundary in Zr/Hf co-doped BT-xBCT at x=0.3,guiding the discovery of a new ferroelectric material with an experimentally measured dielectric constant of 11,051.These results establish FerroAI as a powerful tool for phase diagram construction,guiding the design of highperformance ferroelectric materials. 展开更多
关键词 deep learning model ferroelectric materialshowever phase diagram ferroelectric materialsleveraging phase transformation natural language processing nlp conventional methodsherewe
Buckling and Unbuckling of Superelastic NiTi Tube 认领 引用
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作者 Yao Xiao Dongjie Jiang 《Acta Mechanica Solida Sinica》 SCIE EI CSCD 2022年第4期647-660,共14页
Compared with other loading types,compression is preferred for applications of superelastic NiTi due to the significantly longer fatigue life.However,compressive loading induces concerns on potential structural instab... Compared with other loading types,compression is preferred for applications of superelastic NiTi due to the significantly longer fatigue life.However,compressive loading induces concerns on potential structural instability.In this paper,a phenomenological constitutive model is proposed for superelastic NiTi and integrated into the finite-element model to account for the buckling behavior of superelastic NiTi tubes.The shell-type buckling,column-type buckling and buckling–unbuckling phenomenon are reproduced and verified with experiments by varying the geometric parameters of NiTi tubes(i.e.,diameter-to-thickness ratio and aspect ratio).The reduction in material stiffness associated with the onset and progression of martensitic transformation facilitates column-type buckling.In certain low-aspect-ratio(stout)tubes,unbuckling enables the buckled tube to resume straight configuration under monotonic contraction,which is confirmed to be a consequence of the unique stiff-soft-stiff material law.Shell-type buckling occurs in thin-walled tubes,and it transits to column-type buckling as the tube length increases.A simple theoretical analysis is performed to establish the condition of each buckling type and reasonably good agreement with finite element simulations is reached.The present study will pave the way for the design of anti-buckling shape memory alloy components. 展开更多
关键词 Shape memory alloy Martensitic transformation NiTi tube Buckling Unbuckling
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Intensities and spectral features of the ~4I13/2-~4I15/2 potential laser transition of Er3+ centers in CaF_2-CeF_3 disordered crystal 认领 引用
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作者 王庆国 苏良碧 +13 位作者 刘军芳 刘斌 吴锋 罗平 赵衡煜 施佼佼 薛艳艳 徐晓东 Witold Ryba-Romanowski Piotr Solarz Radoslaw Lisiecki 王占山 唐慧丽 徐军 《Chinese Physics B》 SCIE EI CAS CSCD 2017年第11期239-246,共8页
A CaF2-CeF3 disordered crystal containing 1.06% of Er^3＋ ions was grown by the temperature gradient technique.Optical absorption and emission spectra recorded at room temperature and at 10 K, luminescence decay curve... A CaF2-CeF3 disordered crystal containing 1.06% of Er^3＋ ions was grown by the temperature gradient technique.Optical absorption and emission spectra recorded at room temperature and at 10 K, luminescence decay curve recorded at room temperature, and extended x-ray-absorption fine structure spectra were analyzed with an intention to assess the laser potential related to the ^4I13/2→^4I15/2 transition of Er^3＋. In addition, the thermal diffusivity of the crystal was measured at room temperature. The analysis of room-temperature spectra revealed that the ^4I13/2 emission is long-lived with a radiative lifetime value of 5.5 ms, peak emission cross section of 0.73 × 10^-20 cm^2, and large spectral width pointing at the tunability of the emission wavelength in the region stretching from approximately 1480 nm to 1630 nm. The energies of the crystal field components for the ground and excited multiplets determined from low-temperature absorption and emission spectra made it possible to predict successfully the spectral position and shape of the room-temperature ^4I13/2→^4I15/2 emission band. Based on the correlation of the optical spectra and dynamics of the luminescence decay, it was concluded that in contrast to Yb^3＋ ions in heavily doped CaF2 erbium ions in the CaF2-CeF3 crystal reside in numerous sites with dissimilar relaxation rates. 展开更多
关键词 laser materials crystal growth excited states
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Flash Nano Precipitation to Prepare Inorganic Nanoparticles 认领 引用 被引量：1
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作者 WANG Jianhong LIU Rui 《材料导报》 EI CAS CSCD 北大核心 2019年第3期373-374,共2页
A rapidprecipitation technique,confined mixing induced nano-precipitation is a novel,one-step method for producing nanoparti-cles(NPs)with adjustable size,high specific surface area,sta-ble morphological structure and... A rapidprecipitation technique,confined mixing induced nano-precipitation is a novel,one-step method for producing nanoparti-cles(NPs)with adjustable size,high specific surface area,sta-ble morphological structure and excellent surface and interfaceperformance.It is also called flash nano precipitation(FNP)asits mixing time is on the millisecond scale.A typical FNP processstarts withrapidly mixing a good solvent stream dissolving am-phiphilic copolymer and an anti-solvent stream of the copolymerin the space-confined and tiny chamber.The self-assembly andstability of the organic nanoparticles are achieved via rapid super-saturation and precipitation. 展开更多
关键词 A rapidprecipitation technique confined mixing
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