Abstract

The shortage of the order parameter of the antiferroelectric phase in the previous reference is pointed out. An axial vector R = ∑ iqi ri × Δ ri/V was proposed as the order parameter of the displacive antiferroelectric phase. This vector is of the symmetry groupC ∞ i . Using R as the order parameter, we reinvestigated the antiferroelectric model of Kittle type. We find that the vector can adequately reflect the symmetry change of the paraelectric-antiferroelectric phase transition by using Curie principle.

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