A Mössbauer study of natural gahnite spinels showing strongly temperature-dependent quadrupole splitting distributions
Waerenborgh, João C.; Annersten, Hans; Ericsson, Tore; Figueiredo, Maria O.; Cabral, Juan M.P.
European Journal of Mineralogy Volume 2 Number 3 (1990), p. 267 - 272
published: Jun 21, 1990
manuscript accepted: Mar 5, 1990
manuscript received: Nov 7, 1988
ArtNo. ESP147050203012, Price: 29.00 €
Abstract Natural iron-containing gahnite spinels (ZnAl2O4) are investigated using MÖssbauer spectroscopy. Ferrous and ferric iron are completely ordered into tetrahedral and octahedral sites, respectively. Spectra recorded at 295, 77 and U K show a dramatic change in the absorption envelope ; this effect is ascribed to an inhomogeneous electric field gradient caused by near-neighbour effects acting on the ferrous iron in tetrahedral sites. The magnitude of this effect is shown to increase with increasing Fe2+ substitution.