Temperature dependence of the elastic moduli and damping for polycrystalline LiF-22% CaF2 eutectic salt

Abstract

The Young's and shear moduli and damping were measured for as-cast polycrystalline LiF-22 (mol%) CaF2 eutectic specimens as a function of temperature using the piezoelectric ultrasonic composite oscillator technique (PUCOT). The shear modulus decreased with increasing temperature from about 40 GPa at 295 K to about 30 GPa at 1000 K, while the Young's modulus decreased from about 115 GPa at 295 K to about 35 GPa at 900 K. These values are compared with those derived from the rule of mixtures using elastic moduli data for LiF and CaF2 single crystals. It is shown that, while the shear modulus data agree reasonably well with the predicted trend, there is a large discrepancy between the theoretical calculations and the Young's modulus values, where this disagreement increases with increasing temperature. The reason for this discrepancy is unclear but several possibilities are examined and discussed. The effective activation energy for damping was determined to be about 0.21 eV/atom which was found to be in reasonable agreement with the activation energy for migration of anion vacancies in the CaF2 phase.

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Wolfenden, A., Lastrapes, G., Duggan, M.B. et al. Temperature dependence of the elastic moduli and damping for polycrystalline LiF-22% CaF2 eutectic salt. J Mater Sci 26, 1793–1798 (1991). https://doi.org/10.1007/BF00543604

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Keywords

  • Migration
  • Activation Energy
  • Elastic Modulus
  • Shear Modulus
  • Theoretical Calculation