The preparation of narrow-line 57Fe M$ouml$ssbauer sources and an investigation of some of the causes of their line broadening

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Abstract
A modified method for the preparation of narrow-line 57Fe Mössbauer sources by electrodeposition has been developed and an investigation of the causes of line broadening has been carried out. The effects of the crystallographic structure and the state of perfection of the host have been studied. It has been observed that the linewidths are unaffected by the state of perfection of the host and that the narrowest lines, obtained when the host has face-centred cubic or body-centred cubic structure, have widths at least 30% greater than natural. Microprobe analysis showed that the impurity (source) atoms are homogeneously distributed in the host. The effect of increasing impurity concentration on the linewidth has been investigated. Annealing appears to lead to a rapid initial diffusion of electroplated material which is followed by a much slower penetration which is probably normal bulk diffusion.