Фазовая диаграмма системы Ga-Zn

К оглавлению: Другие диаграммы (Others phase diargams)

Ga-Zn (Gallium-Zinc) J. Dutkiewicz, Z. Moser, L. Zabdyr, D.D. Gohil, T.G. Chart, I. Ansara, and C. Girard The equilibrium phases of the Ga-Zn system are (1) the liquid, L; (2) the hexagonal (Zn) terminal solid solution, with a maximum solubility of 2.36 at.% Ga at 260 C; and (3) the orthorhombic (Ga) solid solution, with a maximum solubility of 0.8 at.% Zn at 20 C. No data on the solid solubility curve are available. The assessed phase diagram was obtained by thermodynamic modeling and is based primarily on the work of [32Pus], [55Val], [58Heu], [62Cha], [63Del], [65Dav], and [74Shu]. The calculated eutectic composition and temperature agree very well with the experimental results. The solid solubility curve of Ga in (Zn) on the Zn-rich side is shown in the assessed diagram. [63Del] determined that at 10 с 0.2 C, a peritectic transformation occurs in which an unidentified compound is formed; the composition of the liquid is 0. 06 at.% Zn. At lower temperatures, a eutectic transformation exists virtually at the melting temperature of Ga(II). The position of the liquidus curve of the Ga-Zn system is very sensitive with respect to the cooling rate [74Shu]. A cooling rate of 0.3 to 1 C/min shifts the liquidus curve to lower temperatures by about 12 C for alloy compositions between 0 to 5 at.% Zn. 32Pus: N.A. Pushin, S. Stepanovic, and V. Stojio, Z. Anorg. Chem., 209, 329- 339 (1932) in German. 55Val: V. Valenti and M. Fiorani, Gazz. Chim. Ital., 85, 620-635 (1955) in Italian. 58Heu: T. Heumann and B. Predel, Z. Metallkd., 49, 90-95 (1958) in German. 62Cha: T.G. Chart, N.P.L. Rep. M-2984, National Physical Laboratory, Teddington, UK (1962). 63Del: S. Delcroix, A. Defrain, and I. Epelboin, J. Phys. Rad., 24, 17-20 ( 1963) in French. 65Bar: C.S. Barrett and F.J. Spooner, Nature, 207, 1382 (1965). 65Dav: D.A. Davis, J. Inst. Met., 93, 515-516 (1965). 74Shu: P.E. Shurai, W.N. Danilin, I.T. Sryvalin, and A.G. Dolesov, Izv. Akad. Nauk. SSSR, Met., 5, 245 (1974) in Russian. Published in Bull. Alloy Phase Diagrams, 11(1), Feb 1990. Complete evaluation contains 4 figures, 5 tables, and 23 references. 1