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Strain anomaly and orientational disorder in the tetragonal phase of KHF2: Phenomenological theory and microscopic model.

The anomalous temperature dependence of the volume, of the spontaneous tetragonal strain, and of the orientational order parameter, observed experimentally at about 408 K within the tetragonal phase of KHF 2 is described with the use of a phenomenological theory based on the symmetry of the crystal. The relations among the coefficients of the free energy needed to account for the observed anomaly are specified and the corresponding behavior of other physical properties is predicted. The compressible three-state Potts model is then constructed in an attempt to relate the anomaly with microscopic interactions of the orientationally disordered (F-H-F) - anions