摘要
用固相反应法制备了La0.7-xSmxSr0.3MnO3,La0.7-xGdxSr0.3MnO3和La0.7-xDyxSr0.3MnO3(x=0.00,0.10,0.20,0.30)系列样品。通过M-T曲线,ρ-T曲线,研究了用稀土离子代换La对La0.7Sr0.3MnO3磁电性质和磁电阻的影响。结果表明:稀土离子代换La引起的晶格畸变和稀土离子的额外磁性对钙钛矿锰氧化物的磁电性质影响很大;稀土离子代换La是改变钙钛矿锰氧化物居里温度和增强MR的有效途径;适量稀土离子代换La可以在室温附近产生大的磁电阻。
A series of samples La0.7-xSmxSr0.3MnO3, La0.7-x Gd, Sr0.3 MnO3 and La0.7-x DyxSr0.3 MnO3 （ x = 0.00, 0.10, 0.20, 0.30） were prepared by solidstate reaction. The influence of rare-earth ions substitution for La on magnetic and electric properties and on magnetoresistance （MR） was studied through the measurements of M-T curves and ρ-T curves. The results showed that the lattice distortion induced by therare-earth ions substitution for La and extra magnetism of the rare-earth ions had great influence on magnetic and electric properties of perovskite manganite. And the rare-earth ions substitution for La was an effective way to change Curie temperature and to strengthen MR in perovskite manganite; and an appropriate doping proportion would generate a large MR near room temperature.
出处
《中国稀土学报》
CAS
CSCD
北大核心
2008年第5期640-646,共7页
Journal of the Chinese Society of Rare Earths
基金
国家自然科学基金重点项目(19934003)
安徽省教育厅自然科学研究重大项目(ZD2007003-1)
安徽省高等学校自然科学研究项目(KJ2008A19ZC)
宿州学院教授(博士)科研启动基金项目(2006jb02)
关键词
磁电性质
庞磁电阻
居里温度
稀土离子代换镧
钙钛矿锰氧化物
稀土
magnetic and electric properties
colossal magnetoresistance
curie temperature
rare earths substitution for La
perovskite manganite
rare earths
