Physics
Scientific paper
Mar 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993georl..20..387f&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 20, no. 5, p. 387-390.
Physics
54
Crystal Structure, Earth Mantle, Perovskites, Physical Properties, Thermal Expansion, Phase Transformations, Synchrotron Radiation, X Ray Diffraction
Scientific paper
High pressure and high temperature in situ X-ray observations of MgSiO3 perovskite were carried out using a newly developed Drickamer-type apparatus combined with synchrotron radiation. Variations of the unit cell parameters of the perovskite were observed as a function of temperature up to about 1900 K at 36 GPa. The orthorhombic distortion changed very little and no indication of transformations to higher symmetry phases was observed up to 1900 K. This result indicates that the orthorhombic perovskite is the stable phase of MgSiO3 in the most part of the lower mantle. The thermal expansivity of the perovskite is determined to be larger than 1.7(2) x 10 exp -5/K at 36 GPa and room temperature. This value will give an important constraint to the chemical composition of the lower mantle.
Funamori Nobumasa
Yagi Takehiko
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