The phase transition in ammonium Rochelle salt is interpreted from the group-theoretical point of view following the Landau theory of phase transition and shown to be improper since it is induced by a two-dimensional representation at k =(1/2) b 1 which correctly describes the observed phase change from the space group D 2 3 to C 2 2 . The expression of the free energy is given in terms of the doubly-degenerate transition parameter, besides the macroscopic polarization and deformation.
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Sawada et al. (1972) studied this question.
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