Фазовая диаграмма системы Ge-Sm

К оглавлению: Другие диаграммы (Others phase diargams)

Ge-Sm (Germanium-Samarium) A.B. Gokhale and G.J. Abbaschian The assessed Sm-Ge phase diagram is based solely on [77Ere]. The system is characterized by hexagonal Sm5Ge3, the richest in Sm in the system, which melts congruently at 1700 C; orthorhombic Sm5Ge4, which forms peritectically at 1500 C; orthorhombic SmGe, which forms peritectically at 1400 C; Sm2Ge3, which forms peritectically at 1355 C and undergoes allotropic transformations at 1085 and 745 C; tetragonal SmGe1.63, which forms peritectically at 760 C; and two eutectic reactions-between (Sm) and Sm5Ge3 at 890 C and 11 at.% Ge, and between (Ge) and SmGe1.63 at 820 C and 85 at.% Ge. [77Ere] indicated all the intermediate phases to be nearly stoichiometric, which is supported by the crystallographic data from other investigations. [ 77Ere] indicated the presence of Sm1.04Ge1.56, which corresponds exactly with the stoichiometry of Sm2Ge3, the designation preferred in this evaluation. The terminal solid solubilities of Sm in (Ge) and Ge in (Sm) have not been determined, but may be estimated as being less than 1 at.%, based on the assumed similarity with other RE-Ge systems. The liquidus was determined with reasonable accuracy by [77Ere]. The process of mixing in the liquid state is exothermic. 77Ere: V.N. Eremenko, V.G. Batalin, and Yu.I. Buyanov, Dop. Akad. Nauk Ukr. RSR B., (5), 413-416 (1977) in Ukrainian. Published in Bull. Alloy Phase Diagrams, 9(5), Oct 1988. Complete evaluation contains 1 figure, 3 tables, and 19 references. Special Points of the Sm-Ge System