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(es - e ∞), 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.
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