不同气氛退火对多晶La0.9Ca0.1MnO3磁矩和比热的影响

doi:10.3724/SP.J.1077.2009.00083

无机材料学报

不同气氛退火对多晶La_0.9Ca_0.1MnO₃磁矩和比热的影响

吴子华^1,2，王群¹，刘新军¹，于伟东¹，李效民¹，陈立东¹

1. 中国科学院上海硅酸盐研究所高性能陶瓷与超微结构国家重点实验室，上海 200050; 2. 上海第二工业大学城市建设与环境工程学院,上海 201209

收稿日期:2008-04-10 修回日期:2008-06-04 出版日期:2009-01-20 网络出版日期:2009-01-20

Change of the Magnetic Moment and Specific Heat of La_0.9Ca_0.1MnO₃ after Heat Treatment in Oxygen and Argon

WU Zi-Hua^1,2, WANG Qun¹, LIU Xin-Jun¹, YU Wei-Dong¹, LI Xiao-Min¹, CHEN Li-Dong¹

1. State Key Laboratory of High Performance Ceramics and Superfine Microstructures Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China; 2. School of Urban Development and Enviromental Engineeing, Shanghai Second Polytechnic University, Shanghai 201209, China

Received:2008-04-10 Revised:2008-06-04 Published:2009-01-20 Online:2009-01-20

摘要/Abstract

摘要： 对具有电脉冲诱发电阻可逆变化（EPIR）特性的多晶La_0.9Ca_0.1MnO₃在相同条件下经氩气和氧气退火后样品的磁矩和比热进行了研究.实验结果表明，经氧气退火后的磁矩和比热分别比氩气退火后的磁矩和比热增大.对氧气退火后的比热和氩气退火后的比热做差处理后发现，两种气氛退火后的比热差与T^3/2成线性关系.经氧气和氩气退火后的区别在于氧离子浓度的变化.经氧气退火后，氧离子浓度增加，导致样品中铁磁区域的增大，引起磁矩和比热增大.退火后磁矩和比热的变化与EPIR效应中磁矩和比热随电阻状态的变化趋势一致，表明EPIR效应与氧含量的变化有关.
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关键词: La_0.9Ca_0.1MnO₃, 磁矩, 比热, EPIR

Abstract: Magnetic moment and specific heat of La_0.9Ca_0.1MnO₃ after heat treatment in oxygen and argon were studied. It is found that the sample after oxygen treatment has higher magnetic moment and specific heat than that after argon treatment. The difference of specific heat between the samples after oxygen treatment and after argon treatment has linear relationship with T^3/2. The heat treatment in oxygen and argon would induce the change of oxygen density which effect the magnetic moment and specific heat. For EPIR effect, the increase of ferromagnetic regions induced by oxygen motion driven by electric pulses would increase the magnetic moment and specific heat, and the different of specific heat between low resistance state and high resistance state has linear relationship with T^3/2. According to oxygen motion driven by electric pulses model, the low resistance state has higher oxygen density than high resistance state. It implies that the increase of magnetic moment and specific heat with resistance decreasing may arise from the oxygen motion driven by electric pulses for EPIR effect.
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Key words: magnetic moment, specific heat, EPIR, La_0.9Ca_0.1MnO₃

中图分类号:

O484

吴子华,王群,刘新军,于伟东,李效民,陈立东. 不同气氛退火对多晶La_0.9Ca_0.1MnO₃磁矩和比热的影响[J]. 无机材料学报, DOI: 10.3724/SP.J.1077.2009.00083.

WU Zi-Hua,WANG Qun,LIU Xin-Jun,YU Wei-Dong,LI Xiao-Min,CHEN Li-Dong. Change of the Magnetic Moment and Specific Heat of La_0.9Ca_0.1MnO₃ after Heat Treatment in Oxygen and Argon[J]. Journal of Inorganic Materials, DOI: 10.3724/SP.J.1077.2009.00083.

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不同气氛退火对多晶La_0.9Ca_0.1MnO₃磁矩和比热的影响

Change of the Magnetic Moment and Specific Heat of La_0.9Ca_0.1MnO₃ after Heat Treatment in Oxygen and Argon

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