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

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Marco E. Ciriotti
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Mössbauer study of bornite and chemical bonding in Fe-bearing sulphides

Messaggio da Marco E. Ciriotti » sab 07 apr, 2018 20:38

Referenza:
▪ 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. (2018): Mössbauer study of bornite and chemical bonding in Fe-bearing sulphides. Physics and Chemistry of Minerals, 45, 227–235.

Abstract:
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+.
Marco E. Ciriotti

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