Abstract
It was experimentally confirmed by observations of stress-strain hysteresis loop that the room temperature paraelectric phase of NH 4 HSO 4 is ferroelastic. This observation undoubtedly suggests the existence of the prototypic crystal structure from which the paraelectric-ferroelastic phase is derived by the phase transition. By adopting the Pnma phase as a prototype the phase transitions to the room temperature B2 1 /a and then to the ferroelectric Ba phase are group-theoretically analysed. The results are in satisfactory agreement with observations.
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