The third- and fifth-order couplings between elastic strains and the order parameter of a first-order transition have been considered in the Landau free-energy expansion. The thermal hysteresis becomes pressure-dependent owing to the fifth-order coupling. The behaviour of the thermal hysteresis and the pressure hysteresis observed in some transitions of (NH 4 ) 3 H(SO 4 ) 2 and (NH 4 )HSO 4 crystals has been explained.
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Das et al. (1983) studied this question.
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