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Pressure-induced spin transition in FeCO3-siderite studied by X-ray diffraction measurements

Year: 2010
Type: conference-paper
Abstract: We have collected synchrotron X-ray diffraction patterns of FeCO 3 -siderite after or in-situ laser heating at high pressures to 66 GPa. Diffraction peaks of FeCO 3 in all diffraction patterns obtained can be indexed as a trigonal cell. However, calculated cell volumes show an abrupt decrease (about 6.5%) between 47 and 50 GPa at room temperature. This abrupt change of the cell volume on FeCO 3 is possibly due to a pressure-induced spin transition of ferrous Fe (HS: high-spin → LS: low-spin). Because cell parameters obtained at high temperature and at pressures above 50 GPa suggest HS state rather than LS state, the Clapeyron slope of the HS-to-LS transition of FeCO 3 should be positive.
DOI: 10.1088/1742-6596/215/1/012002
Authors: T Nagai, T Ishido, Y Seto, D Nishio-Hamane, N Sata, K Fujino
Institutions: Hokkaido University, Kobe University, The Institute for Solid State Physics, The University of Tokyo, The University of Tokyo, Japan Agency for Marine-Earth Science and Technology, Ehime University, Geodynamics Research Center, Ehime University
Language: English
Subfield: Geophysics
Open Access status: diamond
Award: G716016493
OpenAlex ID: W2133481982
FWCI: 7.156
Cites: 14
Cited by: 34
Related to: 10