New accurate compression data for γ-Fe2SiO4

Details New accurate compression data for γ-Fe2SiO4 New accurate compression data for γ-Fe2SiO4

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010pepi..183..421n&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 183, Issue 3-4, p. 421-425.

Physics

1

Scientific paper

The equation of state for γ-Fe2SiO4 was determined by single-crystal X-ray diffraction up to 10.2 GPa at room temperature. The pressure-volume data, measured at 10 different pressures, do not show any evidence of a phase transformation and were fit by a third-order Birch-Murnaghan equation of state. The following coefficients were refined simultaneously: V0 = 559.44(6) Å3, KT0 = 187.3(1.7) GPa, and K′ = 5.5(4). This result implies that the Mg/Fe substitution along the γ-Fo-Fa join does not significantly affect the bulk modulus. The sample shows higher K′ than other compositions along the Fo-Fa join, which generally have K′ ˜ 4. Based on our results we can calculate the sound bulk velocity of γ-Fe2SiO4 up to the pressures of the Transition Zone. Due to the larger K′ of γ-Fe2SiO4, the difference in bulk sound velocity between the two end-members decreases with increasing pressure.

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