Thermal expansion of periclase and olivine, and their anharmonic properties

Abstract

Thermal expansions of single-crystal periclase and olivine were measured by a dilatometyic method in a temperature range from room-level to 1000ºC. The calculated thermal expansion coefficients of periclase and olivine are given in a range of temperature from -250 to 1500ºC based on the Gruneisen's theory of thermal expansion. This theory involves several harmonic and anharmonic parameters. The parameters determined in this study are well related to acoustic wave velocities, pressure and temperature derivatives of bulk modulus, Gruneisen's parameter, which have been determined by other means. It is shown that the accurate thermal expansion data provide a good estimation of elastic wave velocities and other physical constants, which are important in the study of the equation of state of the deep interior of the earth. © 1975, The Seismological Society of Japan, The Volcanological Society of Japan, The Geodetic Society of Japan. All rights reserved.