高等学校化学学报

高等学校化学学报 ›› 1999, Vol. 20 ›› Issue (4): 629.

• 论文 • 上一篇    下一篇

La1-xLixMnO3体系的输运特性及EPR研究

周险峰1,2, 李莉萍1,2, 宋小羽1, 苗继鹏1, 苏文辉1,2,3   

  1. 1. 吉林大学物理系, 长春 130023;
    2. 中国科学院长春应用化学研究所稀土化学与物理开放实验室, 长春 130022;
    3. 中国科学院国际材料物理中心, 沈阳 110015
  • 收稿日期:1998-08-31 出版日期:1999-04-24 发布日期:1999-04-24
  • 通讯作者: 苗继鹏
  • 作者简介:周险峰,男,31岁,硕士,讲师.
  • 基金资助:

    国家自然科学基金(批准号:19804005);中国科学院长春应用化学研究所稀土化学与物理开放实验室资助

Transport Property and EPR Studies for La1-xLixMnO3System

ZHOU Xian-Feng1,2, LI Li-Ping1,2, SONG Xiao-Yu1, MIAO Ji-Peng1, SU Wen-Hui1,2,3   

  1. 1. Department of Physics, Jilin Universitya, Changchun, 130023;
    2. Key Lab. of Rare Earth Chemistry and Physics, Chinese Academy of Sciences, Changchun, 130022;
    3. International Center for Materials Physics, Academia Sinica, Shenyang, 110015
  • Received:1998-08-31 Online:1999-04-24 Published:1999-04-24

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摘要： 利用固相反应法合成了掺杂锂的La1-xLixMnO3(x=0,0.10,0.15,0.20,0.25,0.30)钙钛矿氧化物.XRD测试表明,所有样品均为菱方结构.除x=0,0.3外,其它样品均随温度的降低在液氮温区可观察到从绝缘态到金属态的转变,其中x=0.15样品的转变温度最高为167K.在H=1T的磁场下,出现了负磁阻现象.EPR谱上的g=2.00信号与Mn3+和Mn4+组成的复合团簇有关.

关键词: La1－xLixMnO3, EPR, Mn3+－Mn4+复合团簇, 磁阻

Abstract: The perovskite oxides La1-xLixMnO3were prepared by solid state reactions. The XRD results indicate that all samples crystallize in rhombohedral structure. Except x=0, 0.3 ones, all samples show a transition from insulator to metal with decreasing temperature within the liquid nitrogen temperature region, where x=0.15 sample exhibits the highest transition temperature. The negative magnetoresistance phenomena is observed at applying the magnetic field with H=1.0 T. The EPRsignal with g=2.00 is closely related with the complex of Mn3+-Mn4+clusters.

Key words: La1-xLixMnO3, EPR, Mn3+-Mn4+clusters, Magnetoresistance

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