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Pressure-induced phase transition in Mg0.8Fe0.2O ferropericlase |
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| Authors: | Innokenty Kantor Leonid Dubrovinsky Catherine McCammon Anastasia Kantor Sakura Pascarelli Giuliana Aquilanti Wilson Crichton Maurizio Mattesini Rajeev Ahuja Jailton Almeida Vadim Urusov |
| Institution: | 1. Bayerisches Geoinstitut, Universit?t Bayreuth, 95440, Bayreuth, Germany 2. European Synchrotron Radiation Facility, 6 Rue J. Horowitz, BP 220, 38043, Grenoble Cedex 9, France 3. Condensed Matter Theory Group, Uppsala University, 256, 751 05, Uppsala, Sweden 4. Departamento de Física de la Materia Condensada, Universidad Autónoma de Madrid, 28049, Madrid, Spain 5. Department of Crystallography, Moscow State University, GSP-2, Lenin Hills, 119992, Moscow, Russia |
| 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). |
| Keywords: | Diamond anvil cell Ferropericlase High pressure |
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