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The phase diagram of the system InBi-Sn has been determined by thermal analysis, metallographic, and x-ray procedures. A eutectic is formed at 81°± 0.2°C ., containing 16.3 ± 0.1% Sn and 83.7% InBi. The solid solubility of Sn in InBi is less than 0.1%. Sn dissolves 42% InBi at 81°C. and 20% at 71°C. An X-RAY and microscopic study of portions of the ternary system In-Bi-Sn showed that the InBi phase and Sn solid solutions coexisted over most of the compositional range of the InBi-Sn pair and that the two formed a quasi-binary section. The nature of this phase diagram was established by thermal analysis, x-ray, and microscopic examination. EXPERIMENTALMaterials. The indium (on loan from the Indium Corpora-

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