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A comparative DFT study of the mechanical and electronic properties of greigite Fe3S4 and magnetite Fe3O4

Roldan, A., Santos Carballal, David and de Leeuw, Nora H. 2013. A comparative DFT study of the mechanical and electronic properties of greigite Fe3S4 and magnetite Fe3O4. Journal of Chemical Physics 138 (20) , 204712. 10.1063/1.4807614

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Abstract

Greigite (Fe3S4) and its analogue oxide, magnetite (Fe3O4), are natural minerals with an inverse spinel structure whose atomic-level properties may be difficult to investigate experimentally. Here, [D. Rickard and G. W. Luther, Chem. Rev.107, 514 (Year: 2007)10.1021/cr0503658] we have calculated the elastic constants and other macroscopic mechanical properties by applying elastic strains on the unit cells. We also have carried out a systematic study of the electronic properties of Fe3S4 and Fe3O4, where we have used an ab initio method based on spin-polarized density functional theory with the on-site Coulomb repulsion approximation (Ueff is 1.0 and 3.8 eV for Fe3S4 and Fe3O4, respectively). Comparison of the properties of Fe3S4 and Fe3O4 shows that the sulfide is more covalent than the oxide, which explains the low magnetization of saturation of greigite cited in several experimental reports.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Chemistry
Subjects: Q Science > QD Chemistry
Publisher: American Institute of Physics
ISSN: 0021-9606
Last Modified: 22 Dec 2017 19:48
URI: http://orca-mwe.cf.ac.uk/id/eprint/72364

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