Abstract
To examine the effect of alloying In with Cd on the lattice stability, the elastic constants of single crystals of the tetragonal In 3.42 at.% Cd alloy have been determined. The shear modulus 1 2 (C 11 − C 12) is even less in the alloy than in In and decreases rapidly as temperature rises. It is concluded that the [110], q‖[ 1 10 ] acoustic phonon mode is soft near the zone centre and softens even further as the phase boundary demarking the incipient diffusionless phase transition is approached.
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