Abstract
Ultrasonic measurements of ${c}_{44}$ shear elastic constants are reported in ${\mathrm{K}}_{\mathrm{x}}$${\mathrm{Na}}_{1\mathrm{\ensuremath{-}}\mathrm{x}}$CN mixed crystals. The data were analyzed quantitatively with a quenched--random-field model. Over the range 0.65x\ensuremath{\le}1 the ${c}_{44}$ data are well represented by the model, and the fitting parameters are consistent with the general pattern of behavior in several other mixed cyanide crystals. For 0.13\ensuremath{\le}x0.65, the ${c}_{44}$(T) data can be represented empirically by the model, but the fitting parameters deviated appreciably from those expected.
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