Фазовая диаграмма системы Bi-Pt

К оглавлению: Другие диаграммы (Others phase diargams)


Bi-Pt (Bismuth-Platinum) H. Okamoto The assessed phase diagram for the Bi-Pt system is based primarily on the work of [62Zhu2] (which superseded [57Zhu]) and [69Bis]. The equilibrium phases are (1) the liquid, L; (2) the rhombohedral terminal solid solution, (Bi); (3) Bi2Pt with four polymorphic forms; (4) a high-temperature phase Bi3Pt2, stable between 685 and 570 C; (5) NiAs-type BiPt; and (6) the fcc terminal solid solution, (Pt). The solubility of Pt in (Bi) is unknown. The calculated initial slope of the ( Bi) liquidus is consistent; the liquidus composition is 1 at.% Pt at 269 C, where the heat of fusion of Bi is 11 300 J/mol [83Cha] and no solubility of Pt in (Bi) is assumed. [65Wee] measured the L/[L + Bi2Pt] liquidus in the temperature range between 560 and 276 C; log (ppm Pt) = 6.987 - (1654/T). This expression appears to fit the observed data below ~440 C. The bBi2Pt liquidus in the assessed diagram is drawn according to this expression. Because the (Pt) liquidus near 100 at.% Pt appears to lie below the ideal liquidus, the homogeneity range of (Pt) is probably very narrow. The ideal liquidus was calculated using the heat of fusion of 19 650 J/mol for Pt given by [83Cha] and assuming no solid solubility of Bi in (Pt). [Hansen] assumed negligible solubility of Bi in (Pt) based on the earlier work of [1888Bar] and [13Gue]. 1888Bar: C. Barus, Am. J. Sci., 136, 427-442 (1888). 13Gue: W. Guertler, Handbuch der Metallographie, Verlagsbuch-Handlung Gerbruder Borntraeger, Berlin, Vol. 1, Part 1, 622 (1913) in German; quoted in [Hansen]. 43Wal: H.J. Wallbaum, Z. Metallkd., 35(10), 200-210 (1943) in German. 53Gla: V.P. Glagoleva and G.S. Zhdanov, Zh. Eksp. Teor. Fiz., 25, 248-254 ( 1953) in Russian. 57Zhu: N.N. Zhuravlev and L. Kertes, Zh. Eksp. Teor. Fiz., 32(6), 1313-1318 ( 1957) in Russian; TR: Sov. Phys. JETP, 5(6), 1073-1078 (1957). 59Zhu1: N.N. Zhuravlev, A.A. Stepanova, and N.I. Zyuzin, Zh. Eksp. Teor. Fiz., 37(3), 880-881 (1959) in Russian; TR: Sov. Phys. JETP, 10(3), 627-628 (1959). 59Zhu2: N.N Zhuravlev, G.S. Zhdanov, and N.E. Aleksevskii, Vestn. Mosk. Univ., Ser. Mat. Astron. Fiz. Khim., 14(3), 117-127 (1959); quoted in [Elliott]. 60Kje: A. Kjekshus, Acta Chem. Scand., 14(6), 1450-1451 (1960). 62Zhu1: N.N. Zhuravlev and A.A. Stepanova, Kristallografiya, 7(2), 310-311 ( 1962) in Russian; TR: Sov. Phys. Crystallogr., 7(2), 241-242 (1962). 62Zhu2: N.N. Zhuravlev, G.S. Zhdanov, and Ye.M. Smirnova, Fiz. Met. Metalloved. , 13(4), 536-545 (1962) in Russian; TR: Phys. Met. Metallogr., 13(4), 51-60 ( 1962). 65Fur: S. Furuseth, K. Selte, and A. Kjekshus, Acta Chem. Scand., 19(3), 735- 741 (1965). 65Wee: J.R. Weeks, Trans. ASM, 58(3), 302-322 (1965). 68Sch: K. Schubert, S. Bhan, T.K. Biswas, K. Frank, and P.K. Panday, Naturwissenschaften, 55, 542-543 (1968) in German. 69Bis: T. Biswas and K. Schubert, J. Less-Common Met., 19, 223-243 (1969) in German. 80Bha1: Y.C. Bhatt and K. Schubert, Z. Metallkd., 71(8), 550-553 (1980) in German. 80Bha2: Y.C. Bhatt and K. Schubert, Z. Metallkd., 71(9), 581-583 (1980) in German. 83Cha: M.W. Chase, Bull. Alloy Phase Diagrams, 4(1), 123-124 (1983). Submitted to the APD Program. Complete evaluation contains 1 figure, 3 tables, and 22 references. Special Points of the Bi-Pt System