Acoustical investigation of magnesium oxide

Abstract

The higher order elastic constants of MgO starting from basic parameters viz. the nearest neighbour distance, hardness parameter using Coulomb and Börn-Mayer potentials have been obtained. These values are utilized to obtain Grüneisen parameters and non-linearity constants. Non-linearity constants ratio, ultrasonic attenuation due to phonon-phonon interaction (<img src='/image/spc_char/alpha.gif' border=0> /f²)_p-pand thermo elastic loss (<img src='/image/spc_char/alpha.gif' border=0> /f²)_thare calculated in a wide temperature range along <100>, <110> and <111> crystallographic directions of propagation for longitudinal and shear waves and compared with available theoretical and experimental results.