THERMOACOUSTIC PARAMETERS OF TERNARY, ANTIFLOURITE STRUCTURE SEMICONDUCTOR COMPOUNDS AND ELEMENTAL SEMICONDUCTORS

摘要

Thermoacoustical parameters of Ternary Semiconductor with tetrahedral co-ordination, An-tiflourite structure Semiconductor compounds and Elemental Semiconductors are evaluated from volume expansivity, data at 300 K. The various thermoacoustical parameters are evaluated by utilising Moelwyn-Hughes parameter (C_1). A relationship between the isothermal, isochoric and isobaric Grueneisen parameters has also been studied. The results have been used to develop and understanding of the significance of microscopic factors such as molecular order and intermolecular forces upon macroscopic thermoacoustic properties. The parameter Y (compressibility) is found to be close to 0.111 from which one may infer that the normal modes of vibrations contributing to heat capacities are very small. The Sharma's acoustical parameter S_0, which is a characteristic of wide variety of substances and it has been found be approximately a constant value of 1.104. The correlation between these parameters nave been established and examined its validity in estimating various parameters like reduced volume is found to be equal to the ratio Moelwyn-Hughes parameter (C_1) with Beyer's nonlinearly parameter (B/A)_0 in the case of Semiconductors. The present treatment has the distinct advantage of calculating several thermoacoustical parameters through simple interrelationships from the knowledge of volume expansivity data alone.