Фазовая диаграмма системы Ce-Cu

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Ce-Cu

Ce-Cu (Cerium-Copper) P.R. Subramanian and D.E. Laughlin The equilibrium phases of the Cu-Ce system are (1) the liquid, L, with no reported miscibility gaps; (2) the fcc terminal solid solution, (Cu), with a maximum solid solubility of Ce in (Cu) close to 0.1 at.% Ce; (3) the Ce-rich dcph terminal solid solution, (bCe), based on the equilibrium phase of pure Ce below 61 C; (4) the Ce-rich fcc terminal solid solution, (gCe), based on the equilibrium phase of pure Ce between 61 and 726 C; (5) the Ce-rich bcc terminal solid solution, (dCe), based on the equilibrium phase of pure Ce between 726 and 798 C; (6) the orthorhombic intermediate phase Cu6Ce, stable up to the congruent melting temperature of 938 C; (7) the hexagonal phase Cu5Ce, stable up to the peritectic temperature of 798 C; (8) the orthorhombic phase Cu4Ce, stable up to the peritectic temperature of 796 C; (9) the orthorhombic phase Cu2Ce, stable up to the congruent melting temperature of 817 C; and (10) the equiatomic phase CuCe, stable up to the peritectic temperature of 516 C. The assessed phase diagram is based primarily on the work of [64Rhi], with adjustments in the melting points to conform to the revised temperature scale [Melt]. The solid solubility of Cu in (bCe) is negligible. The maximum solid solubility of Cu in (gCe) is ~0.37 at.% Cu at 708 C [61Gsc], and in (dCe) is ~0.55 at.% Cu at 708 C. A maximum solid solubility of ~0.1 at.% Ce at 870 C was reported by [64Dui]. [84All] reported the existence of Cu3.6Ce, which apparently is a metastable phase that forms only under rapid cooling. They indicate that this phase crystallizes with a stoichiometry of Cu51Ce14 and the Ag51Gd14-type structure. 61Gsc: K.A. Gschneidner, Jr., Rare Earth Alloys, D. Van Nostrand Co., Inc., Princeton, NJ (1961). 64Dui: U.K. Duisemaliev and A.A. Presnyakov, Zh. Neorg. Khim., 9, 2258-2259 ( 1964) in Russian; TR: Russ. J. Inorg. Chem., 9(9), 1220-1222 (1964). 64Rhi: T.B. Rhinehammer, D.E. Etter, J.E. Selle, and P.A. Tucker, Trans. Met. Soc. AIME, 230, 1193-1198 (1964). 84All: C. Allibert, W. Wong-Ng, and S.C. Nyburg, Acta Crystallogr. C, 40, 211- 214 (1984). Published in Bull. Alloy Phase Diagrams, 9(3a), 1988. Complete evaluation contains 3 figures, 7 tables, and 26 references. Special Points of the Cu-Ce System