In Situ Determination of the NiAs Phase of FeO at High Pressure and Temperature
- 9 December 1994
- journal article
- other
- Published by American Association for the Advancement of Science (AAAS) in Science
- Vol. 266 (5191), 1678-1680
- https://doi.org/10.1126/science.266.5191.1678
Abstract
In situ synchrotron x-ray diffraction measurements of FeO at high pressures and high temperatures revealed that the high-pressure phase of FeO has the NiAs structure (B8). The lattice parameters of this NiAs phase at 96 gigapascals and 800 kelvin are a = 2.574(2) angstroms and c = 5.172(4) angstroms (the number in parentheses is the error in the last digit). Metallic behavior of the high-pressure phase is consistent with a covalently and metallically bonded NiAs structure of FeO. Transition to the NiAs structure of FeO would enhance oxygen solubility in molten iron. This transition thus provides a physiochemical basis for the incorporation of oxygen into the Earth's core.Keywords
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