197Au isomer shifts in alloy systems. Chapter 8c

Experiments with 197Au alloys have been performed since the early days of Moessbauer spectroscopy, (MS), and a substantial body of literature exists describing experimental investigations of isomer shifts (IS), and theoretical interpretations of those results. The reported MS studies are divided into the following categories as a preliminary indication of the sorts of experiments that have been performed: the earliest extensive isomer shift measurements studied the electron density at gold as a dilute impurity in a wide range of other metals (Barrett et al., 1963). Subsequently , isomer shifts for a 197Au impurity in d-band host metals have been reported (Wagner et al., 1973; vide ch. 8d). Experiments on alloys of gold with other metals were carried out across the entire range of solid solubility, and these experiments were extended to the study of clustering phenomena and order-disorder transitions. Recently, the effects of doping pure gold with small amounts of other metals have been studied. There has been some research on the IS of intermetallic compounds containing gold. (Auth.)