Sound velocities and single-crystal elasticity of orthoenstatite to 1073 K at ambient pressure

Details Sound velocities and single-crystal elasticity of orthoenstatite to 1073 K at ambient pressure Sound velocities and single-crystal elasticity of orthoenstatite to 1073 K at ambient pressure

Apr 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007pepi..161....1j&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 161, Issue 1-2, p. 1-12.

Physics

6

Scientific paper

Single-crystal Brillouin spectroscopy measurements have been carried out to 1073 K and ambient pressure to determine the elastic modulus tensor of a natural orthopyroxene, nearly pure Mg end-member (Mg0.994Fe0.002Al0.004)2(Si0.996Al0.004)2O6 orthoenstatite. Three single-crystal specimens with orthogonal crystallographic orientations were prepared for Brillouin measurements to determine all the single-crystal elastic moduli (Cij). The single-crystal elastic moduli were calculated using the measured velocities of sound and our independent measurement of the volume thermal expansion. These are, to our knowledge, the highest temperatures at which the complete single-crystal elastic modulus tensor of orthoenstatite has been measured. The elastic moduli at ambient conditions obtained in this study are in excellent agreement with previous measurements on Mg2Si2O6 orthoenstatite (OEN). The elastic anisotropy of OEN is approximately the same at all measured temperatures. The velocities in different directions change at different rates, with C33 showing the largest temperature dependence (decreasing with temperature almost twice as fast as C11 or C22). The variation of elastic moduli with temperature is linear up to approximately 673 K, above which some of the moduli decrease with a quadratic dependence on temperature. The non-linear behavior is in accord with recent elastic mode softening observations in orthoenstatite at higher temperatures and could add support to account for a thermally induced solid-state mechanism for the low velocity zone in Earth's upper mantle.

Affiliated with

Also associated with

No associations

Rating

Sound velocities and single-crystal elasticity of orthoenstatite to 1073 K at ambient pressure does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Sound velocities and single-crystal elasticity of orthoenstatite to 1073 K at ambient pressure, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Sound velocities and single-crystal elasticity of orthoenstatite to 1073 K at ambient pressure will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1360276