Thermo‐acoustical Parameters of Some Semiconductors

The thermo‐acoustical parameters of some compound semiconductors are evaluated in terms of the coefficient of thermal expansion, on the assumption that the Moelwyn‐Hughes parameter is the dominant factor. The Moelwyn‐Hughes parameter has been utilised to establish some simple relations between the lattice Grüneisen parameter, Beyer's, non‐linearity parameter, Rao's acoustical parameter, Sharma's thermo‐acoustical parameter, the fractional available volume, the repulsive exponent of intermolecular potential, the Anderson‐Grüneisen parameter and the molecular constant. A relationship between the isothermal, isochoric, and isobaric Grüneisen parameters has also been studied. An estimated parameter Y is found to have values close to 0.11 form which one may infer that the normal modes of vibrations contributing to heat capacities are very small. Sharma's parameter has been found to be approximately constant in the case of semiconductors studied.