Ferroelectric dispersion of some hydrogen-bonded crystals

Abstract
The ferroelectric dispersion of the dielectric constant of TGS, TGSe and Colemanite, investigated up to 10 GHz and from 18 to 40 GHz, are of the monodispersive Debye-type. The characteristic relaxation frequencies, defined by fo = fe(εs - ε ∞), show a pronounced temperature dependence only in the ferroelectric phase. The experimental curves are compared with a recent phenomenological theory for the dispersion of “electrostrictive” ferroelectrics with a second order transition; qualitative, and in the case of Colemanite nearly quantitative, agreement is found.