Abstract
A dilute solution of metallic tin in palladium has been found to be useful as a source in 119mSn Mössbauer spectroscopy. A 3%-Sn−97%-Pd matrix has been studied in detail and gives rise to single-line resonance spectra with single-line absorbers (e.g., β-Sn, Mg2Sn, etc.). The zero-absorber-thickness extrapolated linewidth obtained with the Pd(Sn) source at 297°K and β-tin absorbers at 77°K was found to be 0.77±0.02 mm sec−1. The recoil-free fraction for the Pd(Sn) source is approximately 0.42 at 297°K. The observed Pd(Sn)–SnO2 isomer shift is 1.46±0.04 mm sec−1 at room temperature and the corresponding Pd(Sn)–Mg2Sn isomer shift is 0.35±0.02 mm sec−1. Palladium—tin matrices with up to ∼10% by weight of tin can be successfully used as narrow-line, large recoil-free fraction sources for Mössbauer spectroscopy at room temperature.
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