Mössbauer study of bornite and chemical bonding in Fe-bearing sulphides
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The Mössbauer spectra of a nearly stoichiometric natural bornite, Cu5FeS4, specimen were reinvestigated between 295 and 4.2 K. There is no difference between the Neél temperature T N as determined by the Mössbauer effect or by the susceptibility measurements (T N = 67.5 K). No additional paramagnetic doublet can be observed in the low-temperature MS spectra. The valence state of Fe is Fe(3−x)+ caused by a partial electron transfer from the Cu+ ions to the Fe3+ ions which increases the shielding of the s-electrons by the d-electron density and by this increases the isomer shift to a value intermediate between tetrahedral high-spin Fe2+ and tetrahedral high-spin Fe3+.
KeywordsMagnetic properties Bornite Mössbauer spectroscopy Chemical bond in sulphides
Authors acknowledge the Departments of Chemistry and of Earth Sciences of the University of Florence, for funding this research under the ex-60% programme, and the Italian CNR, for support.
- Aharoni A (1996) Introduction to the theory of ferromagnetism. Clarendon Press, OxfordGoogle Scholar
- Cotton FA, Wilkinson G, Murillo CA, Bochmann M (1999) Advanced inorganic chemistry, 6th edn. Wiley Interscience, HobokenGoogle Scholar
- Forcher K, Lottermoser W, Amthauer G (1989) Mössbauer study of raguinite, TlFeS2, and thalcusite, Cu3Tl2FeS4. In: Moh GH (ed) Ore minerals: an experimental approach and new observations. N Jb Miner Abh 160:25–28Google Scholar
- Hawthorne F (1988) Mössbauer spectroscopy. In: Hawthorne FC (ed) Spectroscopic methods in mineralogy and geology, Rev Mineral 18:255–340Google Scholar
- McCammon C, Zhang J, Robert M, Hazen L, Finger W (1992) High pressure crystal chemistry of cubanite, CuFe2S3. Am Min 77:937–944Google Scholar
- Morrish AH (1980) The physical principles of magnetism. RE Krieger Publishing Company Inc, MalabarGoogle Scholar
- Przewoznik J, Zukrowski J, Gondek L, Gąska C, Lemański A, Kapusta C, Piestrzyński A (2013) Structural, magnetic, and Mössbauer effect studies of bornite. Nukleonika 58:43–46Google Scholar
- Van der Laan G, Patrick RAD, Charnock JM (2002) Cu L-2, L-3 X-ray absorption and the electronic structure of nonstoichiometric Cu5FeS4. Phys Rev B 6604:135–139Google Scholar
- Vaughan DJ, Burns RG (1972) Mössbauer spectroscopy and bonding in sulphide minerals containing four-coordinated iron. In: Proc 24th IGC, 21–30 September 1972, Montreal, 158–167Google Scholar
- Vaughan DJ, Craig JR (1978) Mineral chemistry of metal sulfides. Cambridge University Press, London, p 494Google Scholar