期刊文献+
共找到5篇文章
< 1 >
每页显示 20 50 100
Recent progress in the development of RE_(2)TMTM’O_(6)double perovskite oxides for cryogenic magnetic refrigeration
1
作者 Lingwei Li Mi Yan 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2023年第5期1-12,共12页
The magnetic functional materials play a particularly important role in our modern society and daily life.The magnetocaloric effect(MCE)is at the basis of a solid state magnetic refrigeration(MR)technology which may e... The magnetic functional materials play a particularly important role in our modern society and daily life.The magnetocaloric effect(MCE)is at the basis of a solid state magnetic refrigeration(MR)technology which may enhance the efficiency of cooling systems,both for room temperature and cryogenic appli-cations.Despite numerous experimental and theoretical MCE studies,commercial MR systems are still at developing stage.Designing magnetic solids with outstanding magnetocaloric performances remains therefore a most urgent task.Herein,recent progresses on characterizing the crystal structure,magnetic properties and cryogenic MCE of rare earths(RE)-based RE_(2)TMTM’O_(6)double perovskite(DP)oxides,where TM and TM’are different 3d transition metals,are summarized.Some Gd-based DP oxides are found to exhibit promising cryogenic magnetocaloric performances which make them attractive for active MR ap-plications. 展开更多
关键词 Magnetocaloric effect(MCE) Rare earths double perovskite(DP)oxides Magnetic functional materials Cryogenic magnetic refrigeration Magnetocaloric performances
原文传递
High-throughput computational screening of oxide double perovskites for optoelectronic and photocatalysis applications 被引量:1
2
作者 Xiaowei Jiang Wan-Jian Yin 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2021年第6期351-358,I0009,共9页
Oxide double perovskites A2 B’B"O6 are a class of emerging materials in the fields of optoelectronics and catalysis.Due to the chemical flexibilities of perovskite structures,there are multiple elemental combina... Oxide double perovskites A2 B’B"O6 are a class of emerging materials in the fields of optoelectronics and catalysis.Due to the chemical flexibilities of perovskite structures,there are multiple elemental combinations of cations A,B’,and B",which leading to tremendous candidates.In this study,we comprehensively screened stable oxide double perovskite A2 B’B"O6 from a pool of 2,018 perovskite candidates using a high-throughput computational approach.By considering a tolerance factor(t)-octahedral factor(μ) phase diagram,138 candidates with Fm 3 m, P21/c,and R3 c phases were selected and systematically studied via first-principles calculations based on density functional theory.The screening procedure finally predicted the existence of 21 stable perovskites,and 14 among them have never been reported.Verification with existing experimental results demonstrates that the prediction accuracy for perovskite formability is approximately 90%.The predicted oxide double perovskites exhibit quasi-direct bandgaps ranging from 0 to 4.4 eV with a significantly small direct-indirect bandgap difference,balanced electron and hole effective masses,and strong optical absorptions.The newly predicted oxide double perovskites may enlarge the pool of material candidates for applications in optoelectronics and photocatalysis.This study provides a route for computational screening of novel perovskites for functional applications. 展开更多
关键词 oxide double perovskites First-principles calculations HIGH-THROUGHPUT OPTOELECTRONICS PHOTOCATALYSIS
下载PDF
High-pressure synthesis, characterization, and equation of state of double perovskite Sr_2CoFeO_6
3
作者 潘跃武 朱品文 王欣 《Chinese Physics B》 SCIE EI CAS CSCD 2015年第1期489-492,共4页
Double perovskite oxide Sr2 Co Fe O6(SCFO) has been obtained using a high-pressure and high-temperature(HPHT)synthesis method. Valence states of Fe and Co and their distributions in SCFO were examined with X-ray p... Double perovskite oxide Sr2 Co Fe O6(SCFO) has been obtained using a high-pressure and high-temperature(HPHT)synthesis method. Valence states of Fe and Co and their distributions in SCFO were examined with X-ray photoelectron spectroscopy. The electric transport behavior of SCFO showed a semiconductor behavior that can be well described by Mott's law for variable-range hopping conduction. The structural stability of SCFO was investigated at pressures up to 31 GPa with no pressure-induced phase transition found. Bulk modulus B0 was determined to be 163(2) GPa by fitting the pressure–volume data to the Birch–Murnaghan equation of state. 展开更多
关键词 double perovskite oxide electric properties high pressure
下载PDF
Double perovskite anti-supported rare earth oxide catalyst CeO_(2)/La_(2)CoFeO_(6)for efficient ventilation air methane combustion 被引量:3
4
作者 Xiaojiao Gao Zehua Jin +5 位作者 Ruisheng Hu Jia'nan Hu Yaqin Bai Pan Wang Jie Zhang Chunxiao Zhao 《Journal of Rare Earths》 SCIE EI CAS CSCD 2021年第4期398-408,共11页
Ventilation air methane is one of available resources with a massive reserve.However,most of ventilation air methane is discharged into the air and pollutes the environment.Catalysts with high temperature resistance(&... Ventilation air methane is one of available resources with a massive reserve.However,most of ventilation air methane is discharged into the air and pollutes the environment.Catalysts with high temperature resistance(>800℃)for ventilation air methane are very essential for utilization of the ventilation air methane.We mainly prepared catalysts CeO_(2)/La_(2)CoFeO_(6)and La_(2)CoFeO_(6)/CeO_(2)and comparative samples CeO_(2)and La_(2)CoFeO_(6)by the simple sol-gel method and calcined them under 9000C,and tested the catalytic performance of ventilation air methane combustion under the condition of 5 vol%H_(2)O.The experimental results show that the light-off temperature(T_(1O))and complete combustion temperature(T_(90))of the ventilation air methane combustion reaction of CeO_(2)/La_(2)CoFeO_(6)catalyst are 417.4 and 587.7℃,respectively.T_(1O)and Tgo of La_(2)CoFeO_(6)/CeO_(2)only reach 425.5 and 615.8℃.The T_(10)and T_(9O)of CeO_(2)/La_(2)CoFeO_(6)are 417.4 and 587.7℃,which are lower than those of La_(2)CoFeO_(6)[T_(10)=452.4℃and T_(90)=673.0℃)and La_(2)CoFeO_(6)/CeO_(2)(T_(10)=425.5℃and T_(90)=615.8℃).Therefore,the catalytic performance of the anti-supported rare earth oxide catalyst CeO_(2)/La_(2)CoFeO_(6)is better than that of La_(2)CoFeO_(6)and supported catalyst La_(2)CoFeO_(6)/CeO_(2). 展开更多
关键词 Rrare earth double perovskite oxide Anti-supported catalyst Ventilation air methane Catalytic combustion
原文传递
Oxide perovskite Ba_(2)AgIO_(6)wafers for X-ray detection
5
作者 Longbo YANG Jincong PANG +5 位作者 Zhifang TAN Qi XIAO Tong JIN Jiajun LUO Guangda NIU Jiang TANG 《Frontiers of Optoelectronics》 EI CSCD 2021年第4期473-481,共9页
X-ray detection is of great significance in biomedical,nondestructive,and scientific research.Lead halide perovskites have recently emerged as one of the most promising materials for direct X-ray detection.However,the... X-ray detection is of great significance in biomedical,nondestructive,and scientific research.Lead halide perovskites have recently emerged as one of the most promising materials for direct X-ray detection.However,the lead toxicity remains a worrisome concern for further commercial application.Great efforts have been made to search for lead-free perovskites with similar optoelectronic properties.Here,we present a lead-free oxide double perovskite material Ba2AgIO6 for X-ray detection.The lead-free,all-inorganic nature,as well as the high density of Ba2AgIO6,promises excellent prospects in X-ray applications.By employing the hydrothermal method,we successfully synthesized highly crystalline Ba2AgIO6 powder with pure phase.Furthermore,we prepared Ba2AgIO6 wafers through isostatic pressure and built X-ray detectors with Au/Ba2AgIO6 wafer/Au photoconductive structure.The as-prepared X-ray detectors showed a sensitivity of 18.9μC/(Gyair$cm2)at 5 V/mm,similar to commercialα-Se detectors showcasing their advantages for X-ray detection. 展开更多
关键词 oxide double perovskite LEAD-FREE X-ray detection
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部