1991 年 60 巻 4 号 p. 1247-1256
A systematic correlation is discovered for a number of ferroelectrics between transition entropy ΔS and the Rhodes-Wohlfarth ratio pc⁄ps, where pc is the effective dipole moment determined from the Curie-Weiss constant assuming the existence of permanent dipoles, while ps is the saturation moment. The unified theoretical model of ferroelectrics, which is capable of describing essential features of both displacive-type and order-disorder-type ferroelectrics, is shown to reproduce the above correlation strikingly well.
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