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• W2181361181 abstract "Other| February 01, 1995 Equation of state, bonding character, and phase transition of cubanite, CuFe2S3, studied from 0 to 5 GPa Catherine A. McCammon Catherine A. McCammon Universitaet Bayreuth, Bayerisches Geoinstitut, Bayreuth, Federal Republic of Germany Search for other works by this author on: GSW Google Scholar American Mineralogist (1995) 80 (1-2): 1–8. https://doi.org/10.2138/am-1995-1-201 Article history first online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Twitter LinkedIn Tools Icon Tools Get Permissions Search Site Citation Catherine A. McCammon; Equation of state, bonding character, and phase transition of cubanite, CuFe2S3, studied from 0 to 5 GPa. American Mineralogist 1995;; 80 (1-2): 1–8. doi: https://doi.org/10.2138/am-1995-1-201 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyAmerican Mineralogist Search Advanced Search Abstract An in-situ study of cubanite, CuFe2S3, was performed in a diamond-anvil cell using Mössbauer spectroscopy and energy-dispersive X-ray diffraction at room temperature and pressures up to 5 GPa. Mössbauer spectra of orthorhombic cubanite show a single Fe site with rapid electron transfer between Fe2+ and Fe3+, a hyperfine magnetic field that is relatively insensitive to pressure, and a center shift that decreases with pressure because of increasing covalency. A phase transition occurs above 3.3 GPa that involves a change from the orthorhombic cubanite structure to a derivative of the hexagonal NiAs (B8) structure, with a zero-pressure volume decrease of 29%. The large difference in volume is caused by a change from tetrahedral to octahedral coordination and a significant shortening of metal-metal bonds. Volume-compression data were fitted to a second-order Birch-Mumaghan equation of state (K0′=4) with the results K0 = 64 ± 3 GPa (orthorhombic phase) and K0 = 157 ± 16 GPa (high-pressure phase). Mössbauer data of the high-pressure phase indicate a single Fe site with no magnetic ordering and a valence intermediate between Fe2+ and Fe3+. Consideration of likely ordering patterns in the high-pressure phase indicates that localized electron transfer could occur along face-shared pairs of Fe octahedra, and extended electron delocalization could occur along paths formed by face- and edge-shared octahedra. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access." @default.
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• W2181361181 title "Equation of state, bonding character, and phase transition of cubanite, CuFe2S3, studied from 0 to 5 GPa" @default.
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