中国物理B ›› 2008, Vol. 17 ›› Issue (1): 317-322.doi: 10.1088/1674-1056/17/1/056
包建春1, 张宁2, 曹鸿霞2, 耿滔3
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)
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.
中图分类号: (Powder processing: powder metallurgy, compaction, sintering, mechanical alloying, and granulation)