NDLI: Isothermal compression behavior of (Mg,Fe)O using neon as a pressure medium

Content Provider	Springer Nature Link
Author	Zhuravlev, Kirill K. Jackson, J. M. Wolf, A. S. Wicks, J. K. Yan, J. Clark, S. M.
Copyright Year	2009
Abstract	We present isothermal volume compression behavior of two polycrystalline (Mg,Fe)O samples with FeO = 39 and 78 mol% up to ~90 GPa at 300 K using synchrotron X-ray diffraction and neon as a pressure-transmitting medium. For the iron-rich (Mg0.22Fe0.78)O sample, a structural transition from the B1 structure to a rhombohedral structure was observed at 41.6 GPa, with no further indication of changes in structural or compression behavior changes up to 93 GPa. In contrast, a change in the compression behavior of (Mg0.61Fe0.39)O was observed during compression at P ≥ 71 GPa and is indicative of a spin crossover occurring in the Fe2+ component of (Mg0.61Fe0.39)O. The low-spin state exhibited a volume collapse of ~3.5%, which is a larger value than what was observed for a similar composition in a laser-heated NaCl medium. Upon decompression, the volume of the high-spin state was recovered at approximately 65 GPa. We therefore bracket the spin crossover at 65 ≤ P (GPa) ≤ 77 at 300 K (Mg0.61Fe0.39)O. We observed no deviation from the B1 structure in (Mg0.61Fe0.39)O throughout the pressure range investigated.
Starting Page	465
Ending Page	474
Page Count	10
File Format	PDF
ISSN	03421791
Journal	Physics and Chemistry of Minerals
Volume Number	37
Issue Number	7
e-ISSN	14322021
Language	English
Publisher	Springer-Verlag
Publisher Date	2009-12-23
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	(Mg,Fe)O Lower mantle Spin crossover Phase transition Mineral Resources Geochemistry Mineralogy Crystallography
Content Type	Text
Resource Type	Article
Subject	Geochemistry and Petrology Materials Science

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