复合氧化物 LaM_(1-x)Ni_xO_3(M=Fe,Ni)的晶体结构及电性的研究

Investigation of the structural and electrical properties of complex oxides LaM 1-x Ni xO 3(M=Fe,Ni)

采用柠檬酸络合法、固相反应法分别制备ＬａＦｅ１ｘＮｉｘ０３和ＬａＭｎ１ｘＮｉｘＯ３。用差热分析法、Ｘ射线法、四探针电阻测量法对化合物的晶体结构、电性进行研究。结果表明：ｘ＜０．５时化合物为单相的钙钛矿结构，ＬａＦｅ１ｘＮｉｘ０３的导电性比ＬａＭｎ１ｘＮｉｘＯ３差，导电通道为—（Ｍ、Ｎｉ）—０—；ｘ≥０．５时化合物为畸变的钙钛矿结构，两者的电性相近，通道为—（—０—Ｎｉ—）—。

LaM 1-x Ni xO 3(M=Fe,Ni)(o<x≤0.1) were prepared by decomposition of citric com plexes and solid state reaction method respectively;their crystal structure and electricity properties were investigated by means of powder X-ray diffraction TDA, electrical resistivity measurem ents. The resuits showed that: when x<0.5 the sam ples possessed single phase perovskite structure, the electrical conductivity of LaFe 1 xNi x0 3 were less than those of LaMn 1 xNi xO 3, and their electron transport path were —(M,Ni)—O—;when x≥0.5, the sam ples possessed distorted perovskite structure, the electrical conductivity of both series were almost equal,and their electron transport path were (0 Ni ).