La0.67Sr0.33MnO3中Ag-Ti的掺杂效应

功能材料与器件学报 , 2007, 13(2): 181-184. doi: 10.3969/j.issn.1007-4252.2007.02.017

La0.67Sr0.33MnO3中Ag-Ti的掺杂效应

王军华 ^1, , 黄宝歆 ^2, , 原晓波 ^3, , 王成建 ^4, , 刘宜华 ^5, , 梅良模 ^6,

1.潍坊学院物理系,潍坊,261061

2.潍坊学院物理系,潍坊,261061

3.山东大学物理与微电子学院和晶体材料国家重点实验室,济南,250100

4.山东大学物理与微电子学院和晶体材料国家重点实验室,济南,250100

5.山东大学物理与微电子学院和晶体材料国家重点实验室,济南,250100

6.山东大学物理与微电子学院和晶体材料国家重点实验室,济南,250100

基金项目: 潍坊学院校科研和教改项目(2005Z02) 国家重点基础研究发展计划(973计划)(G1998061310)

关键词：钙钛矿锰氧化物 , Ag掺杂的锰氧化物 , 两相复合体系 , 室温磁电阻

Doping effect of Ag-Ti in La0.67 Sr0.33 MnO3

将La0.67Sr0.33MnO3(LSMO)、Ag2O及TiO2粉混合经高温烧结后制备了钙钛矿相/xAg两相复合体系(x是Ag与钙钛矿材料的物质的量比),系统地研究了Ag-Ti的共掺杂对LSMO电性和磁电阻效应的影响.0.07摩尔比Ti4+离子的B位掺杂使LSMO的居里温度降至室温.Ag的掺入对Tc影响不大,Tp逐渐升高.由于钙钛矿颗粒属性的改善和金属导电通道的出现,材料的电阻率明显下降.Ag掺杂使室温磁电阻得到显著增强,室温下从x=0.30样品中得到最大的磁电阻,约为32%,是La0.67Sr0.33MnO3样品的8倍,La0.67Sr0.33Mn0.93Ti0.07O3样品的1.6倍.

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