Abstract
Combined X-ray powder diffraction, Mössbauer, and XANES spectroscopy in situ experiments revealed the transformation of cubic (Mg0.8Fe0.2)O ferropericlase to a rhombohedrally distorted phase at 35(1) GPa and room temperature. The Mössbauer spectroscopy results show that the rhombohedral distortion does not involve magnetic ordering. Combined with data from the literature, our results imply that the cubic to rhombodedral transition occurs in (Mg,Fe)O under conditions of non-hydrostatic stress over a wide range of composition (0.2≤x Fe≤1).
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Acknowledgement
This study was partly supported by DFG, RFBR, Russian Federation Government support of the leading scientific schools, Swedish Research council (VR), and CNPq (Brazil). The authors would also like to acknowledge G. Hermannsdorfer and H. Fischer for their technical support.
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Kantor, I., Dubrovinsky, L., McCammon, C. et al. Pressure-induced phase transition in Mg0.8Fe0.2O ferropericlase. Phys Chem Minerals 33, 35–44 (2006). https://doi.org/10.1007/s00269-005-0052-z
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DOI: https://doi.org/10.1007/s00269-005-0052-z