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Investigation of pressure effects on elastic parameters of isotropic and anisotropic MgO

A. DOGHMANE1,* , S. DOUAFER1, Z. HADJOUB1

Affiliation

  1. Laboratoire des Semi-Conducteurs, Département de Physique, Faculté des Sciences, Université Badji-Mokhtar, BP 12, Annaba, DZ-23000, Algérie.

Abstract

In this paper, we investigate the effects of increasing pressure, P from 0 to 150 GPa on elastic properties as reflection coefficients, acoustic signatures, acoustic wave velocities, V, and elastic moduli, M in isotropic and anisotropic MgO. It is found that, at a given pressure, all the investigated acoustic parameters depend on crystallographic orientations. Moreover, the analysis and quantification of pressure effects lead to the determination of semi-empirical formulas applicable to all acoustic parameters with different characterising constants. These relations for propagating Rayleigh, longitudinal and transverse waves velocities Vi and for Young’s (shear) modulus M are of the form: Vi=Vio+Aiexp(P/ti) and Mp=Mpo+Bpexp(- P/tp), respectively; where Ai, ti, Bp, tp are characteristic constants for velocities and elastic moduli; the subscript (o) represents the corresponding parameters at zero pressure; the subscripts (i = R, L, T) represent the propagating Rayleigh, longitudinal and transverse waves. These formulas are important for the prediction of elastic parameters at any given pressure and vice versa..

Keywords

MgO, pressure, velocities, elastic constants, anisotropy.

Submitted at: Sept. 19, 2013
Accepted at: Nov. 13, 2014

Citation

A. DOGHMANE, S. DOUAFER, Z. HADJOUB, Investigation of pressure effects on elastic parameters of isotropic and anisotropic MgO, Journal of Optoelectronics and Advanced Materials Vol. 16, Iss. 11-12, pp. 1339-1343 (2014)