Landau expansion parameters for BaTiO3

Xiaoyan Lu, Hui Li, Wenwu Cao

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Abstract

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 BaTiO 3 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.

Original languageEnglish (US)
Article number224106
JournalJournal of Applied Physics
Volume114
Issue number22
DOIs
StatePublished - Dec 14 2013

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All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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