Journal
AMERICAN MINERALOGIST
Volume 97, Issue 1, Pages 128-133Publisher
MINERALOGICAL SOC AMER
DOI: 10.2138/am.2011.3862
Keywords
Magnetite; high pressure; Mossbauer spectroscopy; single-crystal X-ray diffraction
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Funding
- German Science Foundation (DFG) [SPP1236]
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We report results from high-pressure single-crystal X-ray diffraction and Mossbauer absorption experiments on magnetite. Based on high-quality diffraction data, we have obtained accurate information on the crystal structure of magnetite below 25 GPa, which enables an unambiguous interpretation of the Mossbauer data using constrained area ratios and a full transmission integral fit that avoids area distortion due to thickness effects. Based on our analysis, all aspects of the electronic and magnetic properties of magnetite reported previously below 25 GPa at ambient temperature can be explained solely by the enhanced delocalization of 3d electrons of iron atoms. For instance, we present evidence that the compression-induced metallization changes the sign of the charge carrier spin polarization at 15 GPa.
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