The complete set of the room-temperature third-order elastic moduli of CaF₂ were determined from the change in the sound velocity under uniaxial compression. The measured values in units of 10¹¹ dyn/cm² are C₁₁₁=-124.6, C₁₁₂=-40.0, C₁₂₃=-25.4, C₁₄₄=-12.4, C₁₆₆=-21.4, and C₄₅₆=-7.5. The experimentally measured third-order elastic moduli are compared with the theoretically calculated ones, and a good agreement is found. Conclusions pertaining to the lattice-force interactions are presented.
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Alterovitz et al. (1969) studied this question.
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