Abstract
The platinum-selenium phase diagram was investigated by differential thermal analysis, metallography, and X-ray powder diffraction methods. The two previously known intermediate phases, Pt5Se4 and PtSe2, both melt congruently: Pt5Se4 at ∼1070 °C and PtSe2 (under its own vapor pressure) at 1245 ± 10 °C. Pt5Se4 forms a eutectic with Pt at 1065 ± 2 °C and ∼42 at % Se and another one with PtSe2 at 1067 ± 2 °C and somewhat below 45 at.% Se. On cooling, Pt and PtSe2 form a metastable eutectic at 1037 ± 2 °C and ∼43 at % Se. Between PtSe2 and Se, a degenerate eutectic was found at 221 °C, which also indicates negligible solubility of platinum in solid selenium.
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