Abstract
The elastic moduli (c) of single crystal KMgF3 have been determined by the ultrasonic pulse superposition technique as a function of temperature from T=298−550 K, and as a function of pressure from P=1 bar−2.5 kbar. Room temperature values of the elastic moduli and their temperature derivatives are consistent with Reshchikova's (1969) values. Comparison with the data for SrTiO3 indicates that, for most of the moduli, 1/c(∂c/∂T) P and (∂c/∂P) T are very similar for the fluoride-oxide analogue pair, KMgF3-SrTiO3. Values of (∂c/∂P) T for KMgF3 are calculated from a simple central force model using parameters determined for KF and are in good agreement with the measured values. The bulk sound velocity-mean atomic weight relationship, v ф M 1/2=constant, is well obeyed by the fluoroperovskites; comparison with the perovskite oxide data on a log-log plot of v ф versus M leads to a value of 70% for the relative effective charge of the oxides with respect to the fluorides.
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Jones, L.E.A. Pressure and temperature dependence of the single crystal elastic moduli of the cubic perovskite KMgF3 . Phys Chem Minerals 4, 23–42 (1979). https://doi.org/10.1007/BF00308357
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DOI: https://doi.org/10.1007/BF00308357