The high-pressure phases of FeSiO3 with implications for Fe2SiO4 and FeO

Details The high-pressure phases of FeSiO3 with implications for Fe2SiO4 and FeO The high-pressure phases of FeSiO3 with implications for Fe2SiO4 and FeO

Nov 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976e%26psl..33..101l&link_type=abstract

Earth and Planetary Science Letters, vol. 33, Nov. 1976, p. 101-106.

Computer Science

8

Geochemistry, Iron Oxides, Metamorphism (Geology), Silicates, Continuous Wave Lasers, Crystal Lattices, Crystal Structure, Magnesium Compounds, Phase Transformations, Pressure Effects, Quenching (Cooling), Spinel, Temperature Effects, X Ray Diffraction, Yag Lasers

Scientific paper

Phase transformations occurring in FeSiO3 under high pressures and temperatures are investigated experimentally using very fine FeSiO3 powder compressed in a diamond-anvil press and irradiated by a CW YAG laser, attaining loading pressures of 80 to 280 kbar and sample temperatures of approximately 1200 to 1600 C. X-ray diffraction analysis of quenched samples shows that the phase transformations of FeSiO3 occur in the following order with increasing pressure: clinoferrosilite to spinel plus stishovite to wuestite plus stishovite. The previously reported hexagonal perovskite phase of FeSiO3 is not confirmed, and no stability fields are observed for the ilmenite and orthorhombic perovskite modifications. The observed crystallization of nonstoichiometric wuestite at pressures greater than 100 kbar is taken as evidence supporting the interpretation that Fe(3+) is present in the crystal lattice of wuestite quenched from high pressures and temperatures. It is concluded that knowledge of high-pressure phases or phase assemblages found in iron silicates should not be used to predict those for the corresponding magnesium silicates.

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