Elasticity of ScAlO3 at high pressure

Details Elasticity of ScAlO3 at high pressure Elasticity of ScAlO3 at high pressure

Feb 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000pepi..118...65k&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 118, Issue 1-2, p. 65-75.

Physics

8

Scientific paper

ScAlO3 is a close structural analogue for MgSiO3-perovskite in terms of its molar volume, structural distortion and compressional behavior. Polycrystalline specimens of ScAlO3 were synthesized in a 1000-ton multi anvil press at 10 GPa, 1470 K from two different starting materials; amorphous ScAlO3 and mixed oxides. Two well-sintered and fully-transformed specimens were recovered with low porosities of 0.5 and 1.7%. Elastic wave-speeds of these two specimens have been determined up to 3 GPa at room temperature. The results indicate that for these specimens, ∂K/∂P=3.8 and ∂G/∂P=1.9. The pressure derivatives of elastic moduli for the polycrystalline ScAlO3 specimens are expected to be reliable within 10% using this well-established ultrasonic technique. This is demonstrated by comparing determinations of the elasticity of polycrystalline Al2O3 with the available single crystal data. The values of ∂M/∂P of ScAlO3 are consistent with those determined for MgSiO3 perovskite from X-ray P-V study and ultrasonic measurement.

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