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)
a Magnetoeletronic Laboratory, Nanjing Normal University, Nanjing 210097, China; b Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China; cUniversity of Shanghai for Science and Technology, Shanghai 200000, China; d Chemical Department, Nanjing Normal University, Nanjing 210097, China
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.
Accepted manuscript online:
PACS:
81.20.Ev
(Powder processing: powder metallurgy, compaction, sintering, mechanical alloying, and granulation)
Fund: 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).
Cite this article:
Zhang Ning(张宁), Geng Tao(耿滔), Cao Hong-Xia(曹鸿霞), and Bao Jian-Chun(包建春) Chemical composition and magnetism of Ag doped LaMnO3 2008 Chin. Phys. B 17 317
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