The general alloying behaviour of tin with the rare earths was summarized on the base of the available literature data.
A re‐examination of the LaSn alloys has been performed using x‐ray and metallographic analyses. The existence of the following phases has been observed or confirmed:
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The formation heats of the LaSn alloys have been measured using a direct isoperibol calorimeter. The values of ΔHform (solid alloys, room temperature, K cal/g atom) are the following:
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A re‐examination of the YSn alloys has been also carried out confirming the existence and the crystal structures of the following phases: Y5Sn3, Y5Sn4, Y11Sn10, YSn2 and YSn3. A few calorimetric measurements performed on selected Sn‐rich alloys have given the following values of the ΔHform: YSn2 (−15.5 ± 1.0 Kcal/g atom), YSn3 (−12.5 ± 0.5 Kcal/g atom).
The results obtained are discussed briefly and are compared with the data available for other rare earth‐tin alloys.
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