Abstract
The systems PdCb and PtSb, which have not been accurately determined in the palladium-rich and platinum-rich regions, were completely reviewed over narrow intervals of composition (0.2 at.%) using more than a hundred carefully annealed alloys. The binary system PdSb has four very narrow and structurally similar phases around Pd 3Sb which are all formed at very high temperatures (between 1206 and 948°C); there are two non-stoichiometric phases Pd 2Sb and PdSb. Only PdSb 2 was found to be strictly stoichiometric. The thermal stability of all these compounds decreases with increasing antimony content. Quite the reverse was found for the PtSb binary system. The highest melting phase is PtSb 2 (1225°C), then PtSb (1046°C), whereas the four phases poorest in antimony are unstable and show peritectic decomposition at 739°C (Pt 3Sb 2) 675 °C (Pt 3Sb), 748°C (Pt 5Sb) and (625°C) Pt 7Sb. Only Pt 5Sb shows a noticeable range of existence (15.5–18.9 at.% Sb). Both Pt 5Sb and Pt 7Sb are new cubic f.c.c. superlattices.
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