Abstract
Mossbauer spectroscopy has been used successfully to study the site distribution of the Fe2+ ions in the mixed system CsMg1-xFexCl3, with 0.01<or=x<1.00. Five distinct Fe2+ sites can be identified from the spectrum. Their relative intensities, as a function of Fe2+ concentration x, have enabled the authors to assign them to the five possible sites with different arrangements of nearest and second-nearest Fe2+ and Mg2+ neighbours; even second-nearest neighbours in the chains of cations are found to have a large effect on the trigonal crystal field at an Fe2+ ion. They find that the effective trigonal crystal-field parameter Delta for Fe2+ in this system is positive. A temperature-dependent line broadening associated with isolated Fe2+ ions is also reported.
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