Abstract

The adiabatic elastic constants of magnesium silicide have been determined from 80 to 300 °K. The longitudinal and transverse sound velocities were measured in the [llO] and (ill] crystallographic directions by a resonance technique. Values for the three elastic constants at 300 °K are: Ĉ = (12.06 ± 0.17) x 1011 d/cm2, Ĉ = (2.22 ± 0.l8) x 1011 d/cm2, C44 = (4.64 ± 0.05) x 1011 d/cm2. The frequencies of the lattice vibrations have been calculated along the three principal symmetry directions from the elastic constants and the reststrahl frequency, and an approximate frequency distribution was obtained. The lattice specific heat was calculated at several temperatures from this distribution. From the elastic constants, a value of 578 °K was obtained for the Debye temperature at absolute zero. The Debye approximation is not valid above 10 °K.

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