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2009 , Vol. 24 >Issue 1: 83 - 86

DOI: https://doi.org/10.3724/SP.J.1077.2009.00083

研究论文

不同气氛退火对多晶La0.9Ca0.1MnO3磁矩和比热的影响

  • 吴子华 ,
  • 王 群 ,
  • 刘新军 ,
  • 于伟东 ,
  • 李效民 ,
  • 陈立东
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  • 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

  网络出版日期: 2009-01-20

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Change of the Magnetic Moment and Specific Heat of La0.9Ca0.1MnO3 after Heat Treatment in Oxygen and Argon

  • WU Zi-Hua ,
  • WANG Qun ,
  • LIU Xin-Jun ,
  • YU Wei-Dong ,
  • LI Xiao-Min ,
  • CHEN Li-Dong
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  • 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 date: 2008-04-10

  Revised date: 2008-06-04

  Online published: 2009-01-20

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摘要

对具有电脉冲诱发电阻可逆变化（EPIR）特性的多晶La0.9Ca0.1MnO3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T3/2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.

关键词： La0.9Ca0.1MnO3; 磁矩; 比热; EPIR

本文引用格式

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La0.9Ca0.1MnO3磁矩和比热的影响[J]. 无机材料学报, 2009 , 24(1) : 83 -86 . DOI: 10.3724/SP.J.1077.2009.00083

Abstract

Magnetic moment and specific heat of La0.9Ca0.1MnO3 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 T3/2. 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 T3/2. 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.


Key words： magnetic moment; specific heat; EPIR; La0.9Ca0.1MnO3

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