LaCrO_3-NiMn_2O_4复合陶瓷材料结构与性能的研究  

Study on the structure and properties of LaCrO_3-NiMn_2O_4 composite ceramics

作　　者：章天金[1] 刘树英[2] 周东祥[2] 

机构地区：[1]湖北大学物理学与电子技术学院,湖北武汉430062 [2]华中理工大学电子科学与技术系,湖北武汉430074

出　　处：《湖北大学学报（自然科学版）》2000年第2期154-159,共6页Journal of Hubei University：Natural Science

摘　　要：将尖晶石型NiMn2 O4与钙钛矿型LaCrO3这两种电阻率较高的半导体陶瓷热敏材料以适当比例进行复合并经高温烧结后 ,其复合体电阻率大幅度降低 .应用XRD、XPS对复合体的结构及各元素内层电子结合能的位移进行了研究 ,分析了LaCrO3-NiMn2 O4复相陶瓷材料低B高阻的形成机制 .结果表明 :尖晶石型NiMn2 O4与钙钛矿型LaCrO3以适当比例进行复合 ,在高温烧结过程中两种结构的离子间发生了相互迁移 ,离子迁移的结果使钙钛矿相的LaCrO3转变为高电导相的La[Cr1-x-yNixMny]O3(0 <x<1 ,0 <y <1 ,0 <x +y<1 ) ,它使复合体的电阻率大幅度降低 .NiMn 2O 4 spinel and LaCrO 3 perovskite are semiconductor ceramic materials which have high resistivity, but the resistivity of the composite ceramics composed of NiMn 2O 4 spinel and LaCrO 3 and sintered at high temperature reduces significantly. The microstructure and combined energy displacements of inner electrons of various elements are investigated by XRD and XPS. The forming mechanism of low Bvalue and high resistivity of the composite ceramics of NiMn 2O 4 and LaCrO 3 is analyzed. The results show that ion migration exits in the composite ceramics. By ion migration, LaCrO 3 perovskite structure changes into La[Cr 1-x-y Ni x Mn y] O 3 (0<x<1,0<y<1,0<x+y<1),which is high conductive crystal phase, and reduces the resistivity of composite ceramics.

关 键 词：铬酸镧 锰酸镍 复合陶瓷 晶相结构 电导 

分 类 号：TQ174.758[化学工程—陶瓷工业]