Supplement to a Previous Paper on the Mechanism of the Ferroelectric Phase Transformation of (NH_4)_2Cd_2(SO_4)_3. : A Model in Which P_s Arises Perpendicular to the Wave Normal of the Soft Waves
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The paraelectric-to-ferroelectric phase transformation of (NH_4)_2Cd_2(SO_4)_3 is conjectured to be caused by an instability of three degenerate pairs of conjugate lattice vibration modes with a wave length such that the condensation of each pair of conjugate waves should triple the primitive unit cell. This was explained in a previous paper with a model in which the spontaneous polarization vector arises parallel to the wave normal of the condensed soft waves. Reality of this model, however, seems difficult because of a certain severe requirement for its ferroelectricity. The present paper proposes a model in which P_s arises perpendicular to the wave normal. This model implies no such severe requirement.
- 社団法人日本物理学会の論文
- 1972-04-05
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