Soft modes in betaine calcichloride: a new incommensurate ferroelectric
Volkov A. A., Goncharov Yu. G., Kozlov G. V., Albers J., Petzelt J.
Soft modes of two high-temperature phase transitions have been observed in the submillimeter dielectric spectra of betaine calcichloride, which is a new ferroelectric with an incommensurate phase. Anomalies in the temperature dependence of these modes and a multiple production of additional faint lines in the ferroelectric phase have also been observed.