Фазовая диаграмма системы As-Pt

К оглавлению: Другие диаграммы (Others phase diargams)


As-Pt (Arsenic-Platinum) H. Okamoto The assessed As-Pt phase diagram is based on the work of [08Fri] for the composition range ~50 to 100 at.% Pt. The As-rich side of the diagram was not studied because of high As vapor pressure. Originally, [08Fri] speculated the existence of As3Pt2 with a congruent melting point. The assessed diagram shows As2Pt as a congruently melting phase (at >1 atm), because it is the only intermetallic phase confirmed in the As-Pt system. [67Mur] obtained the As vapor pressures over As2Pt between 912 and 1016 C: log P = -20 450/T + 11.70, where P is in atm and T is in K. Because of this high vapor pressure, As2Pt sublimes under 1 atm pressure. The melting point of Pt is 1769.0 C [Melt]. The L = As2Pt + (Pt) eutectic point is at 72 at.% Pt and 597 C [08Fri]. Amorphous As-Pt with ~72 at.% Pt can be formed by splat cooling from the melt [ 83Elb]. The composition corresponds to the L = As2Pt + (Pt) eutectic. 08Fri: K. Friedrich and A. Leroux, Metallurgie, 5(5), 148-149 (1908) in German. 25Dej: W.F. de Jong, Physica, 5, 292-301 (1925) in Dutch. 25Ram: L.S. Ramsdell, Am. Mineralog., 10, 281-304 (1925). 27Ram: L.S. Ramsdell, Am. Mineralog., 12, 79 (1927). 28Ami: G. Aminoff and A.L. Parsons, Am. Mineralog., 13, 110 (1928). 29Tho: L. Thomassen, Z. Phys. Chem. B, 4(4), 279-281 (1929) in German. 60Kje: A. Kjekshus, Acta Chem. Scand., 14(6), 1450-1451 (1960). 61Hey: R.D. Heyding and L.D. Calvert, Can. J. Chem., 39, 955-957 (1961). 65Fur: S. Furuseth, K. Selte, and A. Kjekshus, Acta Chem. Scand., 19(3), 735- 741 (1965). 66Ben: S.L. Bennett and R.D. Heyding, Can. J. Chem., 44(12), 3017-3030 (1966). 67Mur: J.J. Murray and R.D. Heyding, Can. J. Chem., 45(22), 2675-2687 (1967). 68Sta: W.N. Stassen and R.D. Heyding, Can. J. Chem., 46(12), 2159-2163 (1968). 79Szy: J.T. Szymanski, Can. Mineralog., 17, 117 (1979). 83Elb: M. El-Boragy, M. Ellner, and B. Predel, Z. Metallkd., 74(8), 545-548 ( 1983) in German. Submitted to the APD Program. Complete evaluation contains 1 figure, 3 tables, and 20 references. 1