Abstract
Phonon dispersion curves for indium and f.c.t. and f.c.c. indium-thallium alloys have been calculated using the optimised model potential theory. The presence of a soft acoustic mode along [110], polarised [1 1 0] has been established. The closer the alloy composition is to the phase boundary, the softer this mode becomes: 1 2 (C 11–C 12) tends towards zero, in agreement with experimental ultrasonic velocity data.
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