THERMO-ACOUSTICAL PARAMETERS OF SOME SEMICONDUCTORS

The thermo-acoustical parameters of some compound semiconductors are e valuated in terms of the coefficient of thermal expansion, on the assu mption that the Moelwyn-Hughes parameter is the dominant factor. The M oelwyn-Hughes parameter has been utilised to establish some simple rel ations between the lattice Gruneisen parameter, Beyer's, non-linearity parameter, Rao's acoustical parameter, Sharma's thermo-acoustical par ameter, the fractional available volume, the repulsive exponent of int ermolecular potential, the Anderson-Gruneisen parameter and the molecu lar constant. A relationship between the isothermal, isochoric, and is obaric Gruneisen parameters has also been studied. An estimated parame ter Y is found to have values close to 0.11 from which one may infer t hat the normal modes of vibrations contributing to heat capacities are very small. Sharma's parameter has been found to be approximately con stant in the case of semiconductors studied.