Abstract
Acoustic and dielectric properties of deuterated betaine arsenate (DBA), betaine phosphite (BPI) and glycine phosphite (GPI) have been studied in the vicinity of ferroelectric, antiferroelectric and improper ferroelastic phase transitions. The temperature dependences of the velocity and attenuation of acoustic waves and dielectric response, including the electric field effect on dielectric constant, have been studied. It is shown that the dielectric and acoustic properties of the crystals and some features of phase diagrams can be described in the framework of the Landau phenomenological theory with account of bilinear or biquadratic coupling between polar (polarization) and nonpolar (centrosymmetrical or non-centrosymmetrical structural) order parameters.
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