By means of conductivity investigations the solubility of CaO in CaF2 crystals was estimated to be CL(CaO) ≈︁ 3.7 exp (‐0.68 eV/kT) = 3.7 exp (‐7900 K/T) and the diffusion constant of O− ions in CaF2 D(O−) ≈︁ 3 exp (‐2.2 eV/kT) cm2/s = 3 exp (‐25 500 K/T) cm2/s.
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W. Bollmann (1977) studied this question.
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