The pressure dependence of the infrared-active optical phonon mode (νTO1) in alkaline-earth fluorides has been determined up to 45 kbar. The dependence is found to be less than the Raman-active optical phonon mode. The pressure dependence of the νTO1 mode is observed to decrease in the order CaF2>SrF2>BaF2, while the Raman mode remains rather constant with pressure. Grüneisen parameters have been determined and are compared with those obtained for AB-type crystals.
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Ferraro et al. (1971) studied this question.