空穴掺杂Sr_2FeMoO_6的输运性质研究  

Hole doping effects on the transport properties of Sr_2FeMoO_6

作　　者：胡艳春[1] 杨聚宝[1] 胡华杰[2] 陈晨[1] 张克磊[1] 杨海刚[1] 马恒[1] 

机构地区：[1]河南师范大学物理与电子工程学院,河南新乡453007 [2]信阳师范学院物理与电子工程学院,河南信阳464000

出　　处：《功能材料》2013年第3期353-356,共4页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(11074066);河南师范大学博士科研启动资金资助项目(01026500109);河南省科技厅科技攻关资助项目(102102210186;102102210184)

摘　　要：采用扫描电子显微镜和四探针技术研究了空穴掺杂系列样品Sr2-xKxFeMoO6(0≤x≤0.04)的输运性质。结果表明,空穴掺杂提高了该系列样品的结晶度,使颗粒均匀,空洞变少,晶粒尺寸由未掺杂时的约为2μm变化至掺杂量x=0.04时的约为1μm。四探针输运结果表明该系列样品的金属-绝缘体转变温度(TS-M)由未掺杂时的170K变化至掺杂量x=0.04时的72K。晶粒尺寸、阳离子有序、载流子浓度是影响Sr2-xKxFeMoO6输运性质的重要因素。Polycrystalline samples of Sr2-xKxFeMoO6（x=0.00,0.01,0.02,0.03,0.04） were prepared by standard solid-state reaction.By measuring the electrical resistivity,we were able to identify the semiconductor-metal transition temperature（TS-M）,which was found to decrease from 170 to 72K with increasing x.The scanning electron microscope（SEM） result showed that the hole doping remarkably decreased the grain size,enhancing the degree of crystallinity.All these observations can be understood based on the interplay among size change in grain boundary,the anti-site defect concentration and the hole doping.

关 键 词：磁性材料 双钙钛矿 空穴掺杂 输运性质 

分 类 号：TM27[一般工业技术—材料科学与工程]