类钙钛矿化合物中SFN系列的结构及常温电导  

The Structure of SFN Series and its Conduction at Room Temperature on Perovskite-Related Compounds

作　　者：郑程[1] 袁战恒[1] 张良莹[1] 姚熹[1] 

机构地区：[1]西安交通大学电信学院电子工程系,陕西西安710049

出　　处：《电子元器件应用》2002年第4期47-51,共5页Electronic Component & Device Applications

摘　　要：介绍用Fe、Nb对SrTiO_3中八面体B晶位上的Ti离子进行百分之百的取代,调节Fe、Nb的摩尔百分比,使其符合类钙钛矿的A_nB_nO_(3n-1)及A_mB_mO_(3m+2)系列n、m取整数的组分。从制得9种组分的试样X衍射分析看到常温下,仍保持钙钛矿的基本结构。受主一边由蝎针镍结构向钙钛矿结构过渡中,在-50℃～200℃,呈现6个数量级的PTCR区段。在施主一边,20℃～200℃范围出现中、高阻PTCR区段,20℃以下呈现良好介电特性。在14℃～140℃,电阻率随电压变化不大。The Ti-ion was replaced 100% by Fe、Nb on the octahedra B sites in the SrTiO_3, and the mole percentage of Fe、Nb were changed to be in accordance with the components of A_nB_nO_(3n-1) and A_mB_mO_(3m+2) series of the perovskite that n、m are integer. The XRD patterns of nine samples made showed that these samples are brownmillerite structure in the room temperature and i～V patterns exhibited the PTCR characteristic value covers six decades form brownmillerite to perovskite in the range from -50℃ to 200℃ in the acceptor doped and the high resistivity from 10~6Ω·cm to 10^(12)Ω·cm in the range from 20℃ to 200℃ and it is higher 10^(12)Ω·cm in the range from 20℃ to -100℃ in the donor doped. There is no large change in the resistivity in the range from 14℃ to 140℃.

关 键 词：SFN 类钙钛矿 电导 PTCR 温度传感器 

分 类 号：TN604[电子电信—电路与系统]