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Abstract
The free energy of ALHS can be described by a Landau expansion including the term of sixth order of the order parameter. Experimental data concerning the stress dependence of the elastic behaviour allowed an estimation of the parameters of the series expansion. Following from these results it was possible to calculate the angular dependence of the elastic compliance in the ferroelastic phase. In addition, the approximate ferroelastic lattice parameters of ALHS, for which no experimental data have been published yet, could be estimated.