High-pressure structural behavior of α-Fe2O3 studied by single-crystal X-ray diffraction and synchrotron radiation up to 25 GPa
In situ X‑ray diffraction experiments were carried out at pressures up to 25 GPa on a synthetic hematite (α-Fe 2 O 3 ) crystal using synchrotron radiation in an angle-dispersive setup. Experiments were performed in diamond-anvil cells using neon as a pressure-transmitting medium. Single-crystal diff...
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| Hauptverfasser: | , , , , , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
[2011]
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| In: |
American mineralogist
Year: 2011, Jahrgang: 96, Heft: 11/12, Pages: 1781-1786 |
| ISSN: | 1945-3027 |
| DOI: | 10.2138/am.2011.3775 |
| Online-Zugang: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.2138/am.2011.3775 Verlag, lizenzpflichtig, Volltext: https://www.degruyterbrill.com/document/doi/10.2138/am.2011.3775/html 
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| Verfasserangaben: | Pascal Schouwink, Leonid Dubrovinsky, Konstantin Glazyrin, Marco Merlini, Michael Hanfland, Thomas Pippinger, Ronald Miletich |
MARC
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| 520 | |a In situ X‑ray diffraction experiments were carried out at pressures up to 25 GPa on a synthetic hematite (α-Fe 2 O 3 ) crystal using synchrotron radiation in an angle-dispersive setup. Experiments were performed in diamond-anvil cells using neon as a pressure-transmitting medium. Single-crystal diffraction data were collected from omega scans and structural refinements were carried out for 10 pressure points. Bulk and linear incompressibilities were obtained from least-squares fits of refined data to the Eulerian strain based Birch-Murnaghan equation of state. Finite strain analysis suggests a truncation at second order, yielding results of K 0 = 207(3), Ka 0 = 751(17), and K c0 = 492(8) for bulk and axial moduli, respectively. The a-axis is about 1.5 times stiffer than the c-axis. Compression of the main structural feature, the FeO 6 octahedra, is quite uniform, with just slight changes of distortion parameters at higher pressures. | ||
| 650 | 4 | |a axial anisotropy | |
| 650 | 4 | |a Compressibility | |
| 650 | 4 | |a diamond-anvil cell | |
| 650 | 4 | |a hematite | |
| 650 | 4 | |a neon pressure medium | |
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