Two Different Mechanisms of the Curie-Weiss Dielectric Susceptibility in Ferroelectrics

概要

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The Curie-Weiss law of the dielectric susceptibility z in ferroelectrics is shown to bederived from two different mechanisms in the self-consistent phonon approximation:One is the increase in the correlation between dipoles which is related to themagnitude of the electrostatic interaction D. The other is the decrease in the meansquare amplitude of the soft mode, which leads to the Curie-Weiss law through therate of increase 1 /t. of an individual susceptibility with the decreasing effective"dipole moment". The dependence of 7. on temperature has been numerically corn-puted to investigate the dependence of the Curie constant on t. and D. The ratios ofthe paraelectric moment to the saturation moment have been evaluated fromavailable experimental data in ferroelectrics. Deviations of these ratios from unity indisplacive type ferroelectrics are explained in terms of t,.
社団法人日本物理学会の論文
1988-12-15