Elasticity of MgSiO3 in the Perovskite structure

Details Elasticity of MgSiO3 in the Perovskite structure Elasticity of MgSiO3 in the Perovskite structure

Feb 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989sci...243..787y&link_type=abstract

Science (ISSN 0036-8075), vol. 243, Feb. 10, 1989, p. 787-789.

Computer Science

47

Earth Mantle, Magnesium Compounds, Modulus Of Elasticity, Perovskites, Petrology, Pyroxenes, Earth Planetary Structure, Planetary Composition, Planetary Evolution, Refractory Materials, Silicates

Scientific paper

The single-crystal elastic moduli of MgSiO3 in the perovskite structure, the high-pressure polymorph of MgSiO3 pyroxene, have been determined. The data indicate that a mantle with either pyrolite or pyroxene stoichiometry is compatible with the seismic models appropriate to the earth's lower mantle, provided that the shear modulus of MgSiO3 perovskite exhibits a strong negative temperature derivative. Such a temperature derivative falls outside of the range expected for a well-behaved refractory ceramic and could result if the pressure-temperature regime of the earth's lower mantle is near that required for a ferroelastic phase transformation of the perovskite phase.

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