Abstract
The phase relations of the system Pt-Te have been investigated using the conventional sealed-capsule technique. The identification of phases present in the reaction products was made by reflected light microscopy, X-ray diffraction, and electron probe microanalysis. Four binary phases were confirmed to exist in the system: PtTe., Pt3Te4, Pt2Te3 and PtTe2. The composition of all these appears to be constant without showing any appreciable compositional range. The Pt2Te phase was not found in this study. The Te content in platinum and the Pt in tellurium in solid solution are negligible, less than 0.5 at.% up to 1000°C. The eutectic point between Pt and PtTe is near at 40 at.% Te and at 870°C. The Pt2Te3 phase is stable up to about 675°C, whereas the melting point of the Pt3Te4 phase is apparently above 1000°C. The most part of liquidus curve between PtTe2 and Te exists above 1000°C. Physico-chemical properties of Pt-Te phases obtained in this study are given. The revised phase diagram of the Pt-Te system is proposed from this study.
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