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A synchrotron Mössbauer spectroscopy study of (Mg,Fe)SiO_3 perovskite up to 120 GPa

Jackson, Jennifer M. and Sturhahn, Wolfgang and Shen, Guoyin and Zhao, Jiyong and Hu, Michael Y. and Errandonea, Daniel and Bass, Jay D. and Fei, Yingwei (2005) A synchrotron Mössbauer spectroscopy study of (Mg,Fe)SiO_3 perovskite up to 120 GPa. American Mineralogist, 90 (1). pp. 199-205. ISSN 0003-004X. doi:10.2138/am.2005.1633.

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The electronic environment of the Fe nuclei in two silicate perovskite samples, Fe_(0.05)Mg_(0.95)SiO_3 (Pv05) and Fe_(0.1)Mg_(0.9)SiO_3 (Pv10), have been measured to 120 GPa and 75 GPa, respectively, at room temperature using diamond anvil cells and synchrotron Mössbauer spectroscopy (SMS). Such investigations of extremely small and dilute ^(57)Fe-bearing samples have become possible through the development of SMS. Our results are explained in the framework of the “three-doublet” model, which assumes two Fe2+-like sites and one Fe^(3+)-like site that are well distinguishable by the hyperfine fields at the location of the Fe nuclei. At low pressures, Fe^(3+)/∑Fe is about 0.40 for both samples. Our results show that at pressures extending into the lowermost mantle the fraction of Fe^(3+) remains essentially unchanged, indicating that pressure alone does not alter the valence states of iron in (Mg,Fe)SiO_3 perovskite. The quadrupole splittings of all Fe sites first increase with increasing pressure, which suggests an increasingly distorted (noncubic) local iron environment. Above pressures of 40 GPa for Pv10 and 80 GPa for Pv05, the quadrupole splittings are relatively constant, suggesting an increasing resistance of the lattice against further distortion. Around 70 GPa, a change in the volume dependence of the isomer shift could be indicative of the endpoint of a continuous transition of Fe3+ from a high-spin to a low-spin state.

Item Type:Article
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URLURL TypeDescription DOIArticle
Jackson, Jennifer M.0000-0002-8256-6336
Sturhahn, Wolfgang0000-0002-9606-4740
Zhao, Jiyong0000-0002-0777-3626
Hu, Michael Y.0000-0002-3718-7169
Additional Information:© 2005 American Mineralogist. Manuscript received February 23, 2004; Manuscript accepted June 28, 2004; Manuscript handled BY Alison Pawley. We thank J. Li for helpful discussions and for making the XES data available prior to publication. This manuscript beneÞ ted from comments made by D. Andrault and C. Prewitt. Support for this work was provided by the NSF and DOE under contract no. W-31-109-Eng-38 and COMPRES.
Group:Seismological Laboratory
Funding AgencyGrant Number
Department of Energy (DOE)W-31-109-ENG-38
Consortium for Materials Properties Research in Earth Sciences (COMPRES)UNSPECIFIED
Issue or Number:1
Record Number:CaltechAUTHORS:20130311-145836176
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:37449
Deposited On:12 Mar 2013 14:32
Last Modified:09 Nov 2021 23:29

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