Abstract
The 119Sn isomer shifts ∗ at room temperature in some Pt-Sn and Au-Sn alloys have been measured. Larger negative shifts were obtained in the case of Pt-Sn alloys and these were attributed to the lower number of valence s-electrons per atom for platinum compared to that for gold. Both the Pt-Sn and Au-Sn alloys exhibit an approximately linear variation of isomer shift with composition which extrapolates to about zero at 100% Sn. The behaviour of the orthorhombic AuSn 4 phase, however, was anomalous with respect to the other phases, as the isomer shift for this phase exhibits an appreciable positive deviation with regard to the general linear behaviour and is positive with regard to β-Sn.
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