中国物理B ›› 2008, Vol. 17 ›› Issue (1): 317-322.doi: 10.1088/1674-1056/17/1/056

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Chemical composition and magnetism of Ag doped LaMnO3

包建春1, 张宁2, 曹鸿霞2, 耿滔3   

  1. (1)Chemical Department, Nanjing Normal University, Nanjing 210097, China; (2)Magnetoeletronic Laboratory, Nanjing Normal University, Nanjing 210097, China\;Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China; (3)University of Shanghai for Science and Technology, Shanghai 200000, China
  • 出版日期:2008-01-20 发布日期:2008-01-20
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos 10674071 and 20473038), the Foundation of High-Tech Project in Jiangsu Province, China (Grant No BG-2005041).

Chemical composition and magnetism of Ag doped LaMnO3

Zhang Ning(张宁)a)b)†, Geng Tao(耿滔)c), Cao Hong-Xia(曹鸿霞)a)b), and Bao Jian-Chun(包建春)d)   

  1. a Magnetoeletronic Laboratory, Nanjing Normal University, Nanjing 210097, China; b Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China; c University of Shanghai for Science and Technology, Shanghai 200000, China; d Chemical Department, Nanjing Normal University, Nanjing 210097, China
  • Online:2008-01-20 Published:2008-01-20
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos 10674071 and 20473038), the Foundation of High-Tech Project in Jiangsu Province, China (Grant No BG-2005041).

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摘要： By using a sol-gel clue, a set of polycrystalline perovskite samples La$_{1 - x}$Ag$_{x}$MnO$_{3}$ with a nominal doping level $x$ ranging from 0.05 to 0.45 has been synthesized. The chemical composition and the magnetism of the samples were investigated. A little Ag was found seeping from the samples in the sintering process when the doping level exceeded 0.05 and the sintering temperature was higher than 700\du\, resulting in the samples being in multiphase. The magnetic transition points of the samples have been found to decrease with increasing sintering temperature. A concentration-dependent $T_{\rm c}$ similar to that of bivalent metal ion doped perovskite, has been obtained. We believe that the Ag seeping in the sintering process is responsible for those magnetic characteristics.

关键词: granular system, composite, magnetism

Abstract: By using a sol-gel clue, a set of polycrystalline perovskite samples La$_{1 - x}$Ag$_{x}$MnO$_{3}$ with a nominal doping level $x$ ranging from 0.05 to 0.45 has been synthesized. The chemical composition and the magnetism of the samples were investigated. A little Ag was found seeping from the samples in the sintering process when the doping level exceeded 0.05 and the sintering temperature was higher than 700℃ resulting in the samples being in multiphase. The magnetic transition points of the samples have been found to decrease with increasing sintering temperature. A concentration-dependent $T_{\rm c}$ similar to that of bivalent metal ion doped perovskite, has been obtained. We believe that the Ag seeping in the sintering process is responsible for those magnetic characteristics.

Key words: granular system, composite, magnetism

中图分类号:  (Powder processing: powder metallurgy, compaction, sintering, mechanical alloying, and granulation)

  • 81.20.Ev
75.30.Kz (Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)) 81.20.Fw (Sol-gel processing, precipitation) 61.72.up (Other materials) 75.47.De (Giant magnetoresistance)