无机材料学报

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Nd0.67(Sr,Ca)0.33Mn(O,F)3磁电阻材料的结构与性能

刘耀诚a,b; 周和平a; 郭永权a,b; 陶琨a   

  1. a清华大学材料科学与工程系; 北京 100084; b清华大学材料科学与工程系新型陶瓷与精细工艺国家重点实验室 北京 100084
  • 收稿日期:1998-06-26 修回日期:1998-08-17 出版日期:1999-06-20 网络出版日期:1999-06-20

Structure and Properties of Nd0.67(Sr,Ca)0.33Mn(O,F)3 with Colossal Magnetoresistance

LIU Yao-Chenga,b; GUO Yong-Quana; ZHOU He-Pinga,b; TAO Kuna   

  1. aDepartment of Materials Science and Engineering; Tsinghua University Beijing 100084 China; bState Key Laboratory of New Ceramics and Fine Processing; Tsinghua University Beijing 100084 China
  • Received:1998-06-26 Revised:1998-08-17 Published:1999-06-20 Online:1999-06-20

摘要: 通过掺CaF2制得了Nd0.67(Sr,Ca)0.33Mn(O,F)3(NSMO)磁电阻材料,并对它们作了结构分析和磁性能测量.X射线衍射结果表明,NSMO化合物保持Nd0.67Sr0.33MnO3的钙钛矿结构,空间群为Pbnm,Z=4,F-离子占据8d位置;随着CaF2掺入量的增加,晶格常数减小,居里温度降低,而磁电阻性质呈明显的递增趋势·当掺入量为20mol%时,△RR(0)的峰值达到99.7%。

关键词: 磁电阻, Nd0.67Sr0.33MnO3, Rietveld方法

Abstract: Compounds of Nd0.67(Sr,Ca)0.33Mn(O,F)3 (NSMO) with colossal magnetoresistance (CMR)were prepared with CaF2 as dopant. X-ray diffraction with Rietveld analysis showed that NSMO compounds were of perovskite structures, with space groups of Pbnm, Z=4, and F- occupying 8d positions. As more amount of CaF2 were used, the lattice parameters and To of NSMO declined.The magnetoresistance (-△R/R) increased to a maximum of 99.7% when 20mol% CaF2 was doped.

Key words: colossal magnetoresistance, Rietveld analysis, Nd0.67Sr0.33MnO3

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