Mössbauer study of bornite and chemical bonding in Fe-bearing sulphides

The Mössbauer spectra of a nearly stoichiometric natural bornite, Cu 5 FeS 4 , 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 param...

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Published inPhysics and chemistry of minerals Vol. 45; no. 3; pp. 227 - 235
Main Authors Borgheresi, M., Di Benedetto, F., Romanelli, M., Reissner, M., Lottermoser, W., Gainov, R. R., Khassanov, R. R., Tippelt, G., Giaccherini, A., Sorace, L., Montegrossi, G., Wagner, R., Amthauer, G.
Format Journal Article
LanguageEnglish
Published Berlin/Heidelberg Springer Berlin Heidelberg 01.03.2018
Springer Nature B.V
Subjects
Bornite
Chemical bonds
Crystallography and Scattering Methods
Earth and Environmental Science
Earth Sciences
Electron density
Electron transfer
Ferric ions
Geochemistry
Iron
Low temperature
Mineral Resources
Mineralogy
Mossbauer spectroscopy
Organic chemistry
Original Paper
Shielding
Valence
Chemical bond in sulphides
Bornite
Mössbauer spectroscopy
Magnetic properties
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Summary:The Mössbauer spectra of a nearly stoichiometric natural bornite, Cu 5 FeS 4 , 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 Fe 3+ 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 Fe 2+ and tetrahedral high-spin Fe 3+ .
ISSN:0342-1791
1432-2021
DOI:10.1007/s00269-017-0911-4