Crystal structure and thermal expansion of (Mg,Fe)SiO3 perovskite

Details Crystal structure and thermal expansion of (Mg,Fe)SiO3 perovskite Crystal structure and thermal expansion of (Mg,Fe)SiO3 perovskite

Nov 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990georl..17.2089p&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 17, Nov. 1990, p. 2089-2092.

Physics

41

Crystal Structure, Mixed Oxides, Perovskites, Thermal Expansion, X Ray Diffraction, Crystal Lattices, Iron Compounds, Magnesium Compounds, Phase Transformations, Silicates

Scientific paper

High-resolution X-ray diffraction data were collected from 10 to 433 K on a homogeneous polycrystalline specimen of Mg(0.9)Fe(0.1)SiO3-perovskite. Rietveld structural refinement and X-ray absorption fluorescence measurements demonstrate that Fe substitutes for Mg and not Si. The thermal expansion behavior is anisotropic, with the orthorhombic distortion becoming less with increasing temperature. The volumetric thermal expansion, which is dominated by the decrease in octahedral tilts, is 0.000019/K between 150 and 373 K. No evidence of conversion to enstatite could be found up to 873 K.

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