电介质
居里温度
凝聚态物理
铁电性
相变
朗道理论
订单(交换)
介电响应
材料科学
热膨胀
物理
铁磁性
热力学
量子力学
财务
经济
作者
Xiaoyan Lu,Hui Li,Wenwu Cao
摘要
The 6th order Taylor expansion of the free energy in terms of the order parameter has been generally accepted to describe first order structural phase transitions. In recently years, some researchers added the 8th order terms in order to explain the two branches in dielectric loops observed in the BaTiO3 single crystal. We show that the Landau free energy terminated at the 6th orders is sufficient to fit the experimental observations if the rich information in the field-induced phase transitions is explored. By using the typical characteristics of ferroelectric and dielectric double loops above the Curie temperature Tc, the temperature-dependent expansion coefficients can be determined with high accuracy.
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