PMID: 9632384Jun 25, 1998Paper

Elasticity of single-crystal MgO to 8 gigapascals and 1600 kelvin

Science
G ChenD J Weidner

Abstract

The cross pressure (P) and temperature (T) dependence of the elastic moduli (Cij) of single-crystal samples of periclase (MgO) from acoustic wave travel times was measured with ultrasonic interferometry: partial differential2C11/ partial differentialP partial differentialT = (-1.3 +/- 0.4) x 10(-3) per kelvin; partial differential2C110/ partial differentialP partial differentialT = (1. 7 +/- 0.7) x 10(-3) per kelvin; and partial differential2C44/ partial differentialP partial differentialT = (-0.2 +/- 0.3) x 10(-3) per kelvin. The elastic anisotropy of MgO decreases with increasing pressure at ambient temperature, but then increases as temperature is increased at high pressure. An assumption of zero cross pressure and temperature derivatives for the elastic moduli underestimates the elastic anisotropy and overestimates the acoustic velocities of MgO at the extrapolated high-pressure and high-temperature conditions of Earth's mantle.

References


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Citations

Nov 16, 2005·Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences·C Isabella Bovolo
Nov 30, 2000·Proceedings of the National Academy of Sciences of the United States of America·C S ZhaR J Hemley
May 9, 2007·Proceedings of the National Academy of Sciences of the United States of America·Baosheng Li, Robert C Liebermann
Apr 14, 2004·Proceedings of the National Academy of Sciences of the United States of America·Steven D JacobsenJoseph R Smyth

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