TY - JOUR
T1 - Effect of Fe on the equation of state of mantle silicate perovskite over 1 Mbar
AU - Lundin, S.
AU - Catalli, K.
AU - Santillán, J.
AU - Shim, S. H.
AU - Prakapenka, V. B.
AU - Kunz, M.
AU - Meng, Y.
N1 - Funding Information:
The discussions with three anonymous reviewers have improved this paper. T.L. Grove provides the starting materials. N. Chatterjee assisted electron microprobe analysis of the starting materials. This work is partly supported by the National Science Foundation (NSF) to Shim (EAR0337005). Portions of this work were performed at the GSECARS and HPCAT sectors of APS, and beamline 12.2.2 of ALS. GSECARS is supported by the NSF and Department of Energy (DOE). HPCAT is supported by DOE-BES, DOE-NNSA, NSF, and the W.M. Keck Foundation. The 12.2.2 beamline is supported by the COMPRES under NSF. Use of APS and ALS is supported by the DOE.
PY - 2008/5
Y1 - 2008/5
N2 - In order to investigate the effect of Fe on the equation of state (EOS), the volume of the perovskite (Pv) phases, (Mg1-xFex)SiO3, with different Fe contents (x = 0, 0.09, 0.15), has been measured at high pressures up to 1 Mbar in an Ar or NaCl medium. A bulk modulus (K0) ranging between 255 and 261 GPa is obtained when the Au scales consistent with the Pt scale are used and the data are fit to the second order Birch-Murnaghan (BM) equation. When the third order BM equation is used, we obtain K0 = 250-264 GPa and K0′ = 3.7-4.5, which is consistent with previous low-pressure X-ray diffraction and Brillouin measurements. Within experimental uncertainties (0.5% in volume and 6% in bulk modulus), we do not resolve differences in the EOS between Fe-bearing (up to 15%) and Fe-free Pv to 1 Mbar (2600-km depth in the mantle). This is in contrast with the much larger effect of the Fe spin transition for the EOS of ferropericlase (Fp) reported recently. This is perhaps due to much more diverse states of Fe (e.g., oxidation, coordination, and spin states) in Pv than in Fp.
AB - In order to investigate the effect of Fe on the equation of state (EOS), the volume of the perovskite (Pv) phases, (Mg1-xFex)SiO3, with different Fe contents (x = 0, 0.09, 0.15), has been measured at high pressures up to 1 Mbar in an Ar or NaCl medium. A bulk modulus (K0) ranging between 255 and 261 GPa is obtained when the Au scales consistent with the Pt scale are used and the data are fit to the second order Birch-Murnaghan (BM) equation. When the third order BM equation is used, we obtain K0 = 250-264 GPa and K0′ = 3.7-4.5, which is consistent with previous low-pressure X-ray diffraction and Brillouin measurements. Within experimental uncertainties (0.5% in volume and 6% in bulk modulus), we do not resolve differences in the EOS between Fe-bearing (up to 15%) and Fe-free Pv to 1 Mbar (2600-km depth in the mantle). This is in contrast with the much larger effect of the Fe spin transition for the EOS of ferropericlase (Fp) reported recently. This is perhaps due to much more diverse states of Fe (e.g., oxidation, coordination, and spin states) in Pv than in Fp.
KW - Equation of state
KW - Mantle
KW - Perovskite
KW - Spin transition
KW - X-ray diffraction
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U2 - 10.1016/j.pepi.2008.05.002
DO - 10.1016/j.pepi.2008.05.002
M3 - Article
AN - SCOPUS:47049117549
SN - 0031-9201
VL - 168
SP - 97
EP - 102
JO - Physics of the Earth and Planetary Interiors
JF - Physics of the Earth and Planetary Interiors
IS - 1-2
ER -