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 sec, is attributed to the relaxation of Gd³⁺-F^- dipoles in the T₁ complex (Gd³⁺O₄^{2{-}}F^-).
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Kitts et al. (1973) studied this question.
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