Structural properties of magnetite under high pressure studied by Moessbauer spectroscopy
- Department of Physics, Tohoku University, Sendai 980-8578, Japan and Graduate School of Material Science, University of Hyogo, 3-2-1 Koto Hyogo 678-1297 (Japan)
We have measured the Moessbauer spectra of magnetite (Fe{sub 3}O{sub 4}) under a pressure of up to 18 GPa at room temperature using nonenriched high-quality samples. An analysis of the observed Moessbauer spectra confirms that Fe{sub 3}O{sub 4} does not undergo a magnetic or crystalline structural transition up to 18 GPa at room temperature. In the pressure dependences of the refined hyperfine interaction parameters, however, small but distinct anomalies are found at 7.0 GPa in the center shifts of two crystallographically nonequivalent Fe sites, which are caused by the discontinuous decrease of an oxygen internal coordinate in the cubic inverse spinel structure. We believe that the pressure-induced discontinuous change of the Fe-O bond length is related to the absence of a metal-insulator transition above 7.5 GPa.
- OSTI ID:
- 20787987
- Journal Information:
- Physical Review. B, Condensed Matter and Materials Physics, Vol. 73, Issue 10; Other Information: DOI: 10.1103/PhysRevB.73.104110; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1098-0121
- Country of Publication:
- United States
- Language:
- English
Similar Records
Moessbauer and resistivity studies of the magnetic and electronic properties of the high-pressure phase of Fe{sub 3}O{sub 4}
Moessbauer Characterization of Magnetite/Polyaniline Magnetic Nanocomposite