Abstract
An extended three-body force shell model (ETSM) incorporated by the effect of TR coupling and anharmonicity has been applied to investigate the static shear modulii ( c 44) of (KCN) x (RbCN) 1− x mixed crystals. The shear modulii computed between the composition range 0⩽ x⩽1 for the temperature range from 140 to 380 K . The static elastic constants c 44 computed by us show an anomalous behavior with variation in temperature and are in good agreement with ultrasonic measurement data. It also shows a softening in elastic modes at lower temperature.
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