Conjectured Mechanism of the Phase Transformation of a Peculiar Ferroelectric-Ferroelastic Crystal: (NH_4)_2Cd_2(SO_4)_3
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It is hypothesized that the transformation of (NH_4)_2Cd_2(SO_4)_3 from the prototypic phase to the ferroelectric and ferroelastic phase is caused by instability of triply degenerate pairs of conjugate lattice vibration modes with the wave normals along the cubic principal axes and with the wave length equal to three times the lattice constant. Then the strange dielectric anomaly of (NH_4)_2Cd_2(SO_4)_3 which has been observed by Ohshima and Nakamura is deduced naturally. Also, peculiar elastic and piezoelectric anomalies to be observed are deduced.
- 一般社団法人日本物理学会の論文
- 1972-01-05
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関連論文
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