Reorientation Kinetics of Fluoride- and Oxygen-Compensated Dipoles in Gadolinium-Doped Calcium Fluoride

Abstract

A study of the thermal depolarization spectra for crystals of calcium fluoride containing trivalent gadolinium has been made before and after oxygen contamination. In the oxygen-contaminated crystals, a new ionic thermocurrent peak, with an activation energy of 0.49 eV and a reciprocal frequency factor of 5 × ${10}^{-14\mathrm{}}$ sec, is attributed to the relaxation of ${\mathrm{Gd}}^{3+}$-${\mathrm{F}}^{-}$ dipoles in the $T_1$ complex (${\mathrm{Gd}}^{3+}$ $\mathrm{O}_4^{}{}_{}{}^{2-}$ ${\mathrm{F}}^{-}$).