Abstract
The system PtSn was completely revised over narrow intervals of composition (1–2 at.% Sn), using more than 60 carefully annealed alloys (more than 3000 h at T>600°C), measured with differential thermal analysis, X-ray diffraction and electron microprobe analysis. The five stoichiometric intermediate phases have generally higher melting points than previously indicated in the literature for Pt 3Sn (1402°C) and PtSn (1276 °C) and higher peritectic decomposition temperatures for Pt 2Sn 3 (898 °C), PtSn 2 (748 °C) and PtSn 4 (540 °C). The intermediate phase PtSn has a structure similar to PtSn 3 ( P6 3/ mmc), with a strictly stoichiometric composition as shown by electron microprobe and X-ray diffraction methods. The lattice parameters of all intermediate phases in the binary system PtSn have been calculated, showing no detectable variations due to composition. The solubility of platinum in tin is negligible.
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