摘要
测定了La1 -xAx(MnB)O3(A为二价元素 )型巨磁电阻钙钛矿化合物在不同组成时的Curie温度。钙钛矿锰氧化物La1 -xAxMnByO3的A位离子掺杂引起的晶格畸变可以用晶格能来表示 ,晶格能的大小能很好解释A位离子掺杂引起的Curie温度变化 ;B位离子掺杂引起的晶格畸变可用极化力来表示 ,极化力的大小很好解释了B位离子掺杂引起的Curie温度变化。钙钛矿锰氧化物的A ,B位离子同时掺杂引起晶格畸变 ,可以用晶格能和极化力的综合判断系数 (晶格能 /极化力 )来表示 ,它能很好解释A和B位离子同时改变引起的Curie温度变化 ,理论与实验结果一致。
The Curie_temperature of some La 1- x A x (MnB)O 3 perovskite manganates with colossal magnetoresistance was tested. The crystal lattice aberration caused by A_site dopant can be shown by the energy of crystal lattice in La 1- x A x (MnB)O 3 perovskite manganates. The magnitude of the energy can well explain the shift of the Curie_temperature caused by A_site dopant. The crystal lattice aberration caused by B_site dopant can be expressed by the power of electric polarization,which interprets the shift of the Curie_temperature caused by B_site dopant. The crystal lattice aberration caused by A_site and B_site dopants together can be described by an integrative coefficient (ratio of energy of crystal lattice/power of electric polarization), which well interprets the shift of the Curie_temperature. The results from theory and the experiments are found in good agreement.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2002年第4期470-473,共4页
Journal of The Chinese Ceramic Society
基金
国家 973项目 (G19990 64 5 0 8)
国家自然科学基金资助项目 (19890 3 10 )~~
