Ca位置换Fe的氧化物Ca1-xFexMnO3(x=0-0.12)的制备及电输运性能  

Preparation and electrical transport properties of Fe doped Ca_(1-x)Fe_xMnO_3(x=0—0.12) oxide

作　　者：张飞鹏[1] 张忻[1] 路清梅[1] 刘燕琴[1] 张久兴[1] 

机构地区：[1]北京工业大学材料科学与工程学院,新型功能材料教育部重点实验室,北京100124

出　　处：《物理学报》2011年第8期614-618,共5页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:50702003,50801002)资助的课题~~

摘　　要：采用柠檬酸溶胶凝胶结合陶瓷烧结工艺制备了Ca位置换Fe的Ca1-xFexMnO3(x=0—0.12)氧化物粉末及块体试样,通过X射线衍射及电参数测试分析了所得试样.实验结果表明:在实验范围内,所有试样呈单一物相,Ca位置换Fe之后随置换量的增加,CaMnO3的晶胞逐渐变小,晶粒长大受到抑制.测试温度范围内所有试样均呈半导体输运特性,电输运机制未发生变化;当x在0—0.12范围内Fe置换使极化子跃迁能提高,试样各温度点的电阻率随着Fe置换量x的增加而提高.The Fe doped Ca1-xFexMnO3（x=0—0.12） powder and bulk samples are fabricated by citric acid sol-gel and ceramic preparation process,the samples are analzed by X-ray diffraction pattern and electrical constant measurement.The results show that all samples are of single phase,the lattice constants are gradually lowered by Fe doping for Ca site,and the crystalline grain growth is restrained.All the bulk samples have semiconductor transporting characteristics in the whole temperature range of measurement.The transportation mechanism is not changed.The energy for polarons to hop is increased for doped samples and thus the electrical resistivity is increased by increasing Fe doping concentration.

关 键 词：CaMnO3 Fe置换 电输运 

分 类 号：O482.4[理学—固体物理]