The ferroelectric phase transition in Bi4Ti3O12 is interpreted phenomenologically on the basis of a Landau-type free energy. The requirements on the concrete parameter values, necessary to induce the first order tetragonal-monoclinic phase transition in Bi4Ti3O12, are discussed. It turns out that a simple free energy function consisting of six terms in the polarization components p a and p c reproduces well the phase transition itself and the temperature dependence of spontaneous polarizations, while a seventh term is required to reproduce the temperature dependence of the dielectric susceptibilities.
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Yoshihiro Ishibashi (1995) studied this question.
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