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Cation distribution in some natural spinels from X-ray diffraction and Mössbauer spectroscopy

Published online by Cambridge University Press:  05 July 2018

Susanna Carbonin ,
Umberto Russo  and
Antonio Della Giusta
Susanna Carbonin
Affiliation:
Dipartimento di Mineralogia e Petrologia, Università di Padova, Corso Garibaldi 37, 35122 Padua, Italy
Umberto Russo
Affiliation:
Dipartimeuto di Chimica Inorganica, Metallorganica e Analitica, Università di Padova, Via Loredan 4, 35131 Padua, Italy
Antonio Della Giusta
Affiliation:
Dipartimento di Mineralogia e Petrologia, Università di Padova, Corso Garibaldi 37, 35122 Padua, Italy
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Abstract

Three natural spinels of different places of occurrence and compositions were investigated by means of microprobe chemical analysis, single crystal X-ray diffraction and Mössbauer spectroscopy. All cation distributions between T and M sites were calculated from microprobe and XRD experimental data, by means of a mathematical model with appropriate assumptions. Fe2+ and Fe3+ assignments calculated in this way were compared with those observed in Mössbauer spectra. The satisfactory agreement found proves, at least in the samples studied, the reliability of the model and the assumptions used. In the spinels examined, such results show Fe2+ and Fe3+ virtually ordered in T and M sites respectively. Mössbauer data also revealed Fe2+ in different tetrahedral sites due to the next-nearest neighbour effect, probably as a consequence of spinel genetic conditions.

Keywords

spinelcation distributionMössbauer spectroscopyX-ray diffraction
Type
Mineralogy
Information
Mineralogical Magazine , Volume 60 , Issue 399 , April 1996 , pp. 355 - 368
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1996

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