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High-pressure structural behavior of α-Fe2O3 studied by single-crystal X-ray diffraction and synchrotron radiation up to 25 GPa
-
Pascal Schouwink
,
Leonid Dubrovinsky
Published/Copyright:
April 2, 2015
Abstract
In situ X‑ray diffraction experiments were carried out at pressures up to 25 GPa on a synthetic hematite (α-Fe2O3) 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 K0 = 207(3), Ka0 = 751(17), and Kc0 = 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 FeO6 octahedra, is quite uniform, with just slight changes of distortion parameters at higher pressures.
Received: 2010-12-29
Accepted: 2011-6-27
Published Online: 2015-4-2
Published in Print: 2011-11-1
© 2015 by Walter de Gruyter Berlin/Boston
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Keywords for this article
Compressibility;
diamond-anvil cell;
hematite;
axial anisotropy;
neon pressure medium
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- Element diffusion rates in lunar granulitic breccias: Evidence for contact metamorphism on the Moon
- The crystal structure of franckeite, Pb21.7Sn9.3Fe4.0Sb8.1S56.9
- Ammonium vermiculite in schists from the Betic Cordillera (Spain)
- Natrolite is not a “soda-stone” anymore: Structural study of alkali (Li+), alkaline-earth (Ca2+, Sr2+, Ba2+) and heavy metal (Cd2+, Pb2+, Ag+) cation-exchanged natrolites
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