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.
出处
《湖北大学学报（自然科学版）》
CAS
2000年第2期154-159,共6页
Journal of Hubei University：Natural Science
关键词
铬酸镧
锰酸镍
复合陶瓷
晶相结构
电导
lanthanum chromate
nickel manganese
composite ceramics
crystal-phase structure
conductivity
