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

Kirill K. Zhuravlev, J. M. Jackson, A. S. Wolf, J. K. Wicks, J. Yan, S. M. Clark

Research output: Contribution to journalArticle

24 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)465-474
Number of pages10
JournalPhysics and Chemistry of Minerals
Volume37
Issue number7
DOIs
Publication statusPublished - 2010
Externally publishedYes

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