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铁电磁体Pb(Fe1/2Nb1/2)O3相变特征

Gao Xingsen,Chen Xiao-Yuan, Yin Jiang, Liu Jun-Ming, Liu Zhi-Guo

Acta Physica Sinica（1999）

Cited 23|Views3
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Abstract
借助与示差扫描量热法、磁化率测量、电子自旋共振、铁电与介电性质测量及电子衍射系统地研究了Pb(Fe1/2Nb1/2)O3(PFN)的电、磁性质和相变特征．结果表明发生在380K附近的顺电－铁电转变和发生在145K附近的顺磁反铁磁转变分别为一级相变和二级相变或弱一级相变．在室温下，PFN的剩余极化与矫顽场分别为11.5μC/cm2和3.04kV/cm.介电测量表明PFN的顺电-铁电相变为弥散型相变．其弥散指数为1.62.电子衍射表明Fe3+与Nb5+离子在B位置上是无序分布的，正是这种与无序分布相关联的成分涨落导致铁电相变的弥散性.
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ferroeletromagnet,pbfe1/2nb1/2o3,phase
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