A term in polarization energy is added to the Slater-Takagi model of ferroelectricity in KH₂PO₄(KDPH). This free-energy function relates the shift in Curie point temperature due to deuteration of the compound with the measured change in saturation spontaneous polarization. The dielectric constant εc obtained by numerical differentiation of the free-energy function has sharp maximum at the Curie temperature. With a change of parameters, the model also reproduces some of the details of antiferroelectric behavior.
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Michael E. Senko (1961) studied this question.
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