Abstract
Mossbauer (57Fe) absorption spectra of different
orientations of single crystals of cordierite (Mg,Fe)2AI3
[Si5AIO18] have been determined. The variation of the
ratio of the peak areas of the quadrupole split lines with orientation has
enabled the determination of the electric field gradient directions, and the
site positions and occupancies of the Fe2+ and Fe3+ ions.
Of a total iron content of 1.85% w/w, 79% is present as Fe2+
replacing Mg2+ in the octahedral sites; 19% as Fe2+
occupying the larger of two channel sites; and 1% as Fe3+ replacing
Al3+ in the larger of the two tetrahedral sites. A possible
interpretation of the observed pleochroism in terms
of Fe2+-Fe2+ and Fe2+-Fe3+ electranic interactions along the directions of the
electric field gradients of these ions is suggested.
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