Abstract
AbstractOptical activity, electrooptical effect, and ultrasound wave velocities are investigated in the vicinity of phase transitions in the incommensurate ferroelectric crystals (NH4)2ZnCl4. The influence of hydrostatic pressure on the acoustic properties and phase transitions are studied as well. The optical activity and electrooptical effects are found only in the ferroelectric phase. It is shown that the normal‐incommensurate phase transition shifts to high temperatures under the action of hydrostatic pressure. At the same time, the temperature region of modulated phase coexisting becomes narrower and disappears finally at the triple point (Pk = 196 MPa, Tk = 249.5 K). The obtained results are considered within the framework of the phenomenological theory.
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