New accurate compression data for γ-Fe2SiO4
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The equation of state for ¿-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 ¿-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 ¿-Fe2SiO4 up to the pressures of the Transition Zone. Due to the larger K' of ¿-Fe2SiO4, the difference in bulk sound velocity between the two end-members decreases with increasing pressure.
Originalsprog | Engelsk |
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Tidsskrift | Physics of the Earth and Planetary Interiors |
Vol/bind | 183 |
Udgave nummer | 3-4 |
Sider (fra-til) | 421-425 |
Antal sider | 5 |
ISSN | 0031-9201 |
DOI | |
Status | Udgivet - 2010 |
ID: 34371655