Determination of the enthalpies of formation of some platinum antimonides and their phase diagrams under standard conditions

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• 作者：E. G. Osadchii ; T. A. Stolyarova ; M. V. Voronin…
• 关键词：platinum antimonides ; calorimetry ; stumpflite ; geversite ; standard enthalpy ; phase diagram
• 刊名：Geochemistry International
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：55
• 期：2
• 页码：225-229
• 全文大小：
• 刊物主题：Geochemistry;
• 出版者：Pleiades Publishing
• ISSN：1556-1968
• 卷排序：55

文摘

Using the method of direct synthesis calorimetry, we determined the standard enthalpy of formation of PtSb (stumpflite), Δ_fH°_298.15 (PtSb, cr) =–105.16 ± 0.84 kJ/mol and PdSb₂ (geversite), Δ_fH°_298.15 (PtSb₂,cr) =–160.92 ± 0.84 kJ/mol. Isothermal (298.15 K, p = 1 bar) phase diagrams were computed for the Pt–Sb–S and Pt–Sb–O ternary systems in the coordinates composition of the Pt–Sb binary system versus fugacity of a gaseous volatile component (O₂, S₂).