Фазовая диаграмма системы Ce-In

К оглавлению: Другие диаграммы (Others phase diargams)


Ce-In (Cerium-Indium) H. Okamoto The assessed Ce-In phase diagram is based on the experimental data of [80Del], with review of the work of [54Vog]. The equilibrium phases are (1) the liquid, L; (2) four Ce terminal solid solutions, (dCe), (gCe), (bCe), and (aCe); (3) Ce3In, which is AuCu3 type at low temperatures and disordered fcc at high temperatures; (4) Ni2In-type Ce2In; (5) Ce1+xIn, melting congruently at 1140 C and ~47 to 48 at.% In; (6) CeIn1+yIn, stable in a limited temperature range between 890 and 1070 C; (7) Ce3In5, melting congruently at 1170 C; (8) CeCu2- type CeIn2; (9) AuCu3-type CeIn3, melting congruently at 1180 C; and (10) the (In) terminal solid solution. The Ce-In diagram was investigated earlier by [54Vog] (see [Hansen]). Although the outlines of the diagrams of [54Vog] and [80Del] were in agreement, observed phases and reaction temperatures were different in details. Considering the purity of Ce (99.5% [54Vog] and 99.9% [80Del]) and the number of data points, the results of [80Del] generally are preferred in this evaluation when [54Vog] and [80Del] disagree. [80Del] estimated that the maximum solubility of In in (dCe) and (gCe) is 10 and 4 at.%, respectively. The L/[L + CeIn3] liquidus trend indicates that the L = CeIn3 + (In) eutectic composition is very close to 100 at.% In, suggesting very small solubility of Ce in (In). Accordingly, the eutectic temperature is only slightly lower than the melting point of In. Ce3In forms by a peritectic reaction (L + Ce2In = Ce3In) at 910 с 10 C [80Del] . X-ray data suggested the possible existence of a certain range of solid solutions, especially at high temperatures [80Del]. Further studies are needed, because this solubility range could also be due to a possible stabilization effect of impurities [80Del]. Ce3In has the AuCu3-type structure [66Dar]. However, when quenched from 750 C, a partially disordered state was observed in Ce3In [80Del]. Therefore, it is possible that this phase shows an order-disorder transition below 750 C. A few thermal effects observed in the range between Ce1+xIn and Ce3In5 indicated existence of solid-state transformations at 1070 and 890 C [80Del]. Similar phases, stable only in similar temperature ranges, exist in the La-In and Pr-In systems. Although the structure was not identified, the possibility of a CsCl-type phase in this temperature range cannot be ruled out [80Del]. The antiferromagnetic behavior of CeIn3 was measured in the temperature range 2 to 250 K by [65Tsu]. The N‚el temperature is 10 K [65Tsu] or 11 K [69Bus]. 54Vog: R. Vogel and H. Klose, Z. Metallkd., 45(11), 633-638 (1954) in German. 60Ian: A. Iandelli, Atti Acad. Naz. Lincei, Rend. Cl., Sci. Fiz. Mat. Nat., 29, 62-69 (1960) in Italian. 63Col: L. Colombo and G.L. Olcese, Atti Acad. Naz. Lincei, Rend. Cl., Sci. Fiz. Mat. Nat., 35, 53-57 (1963) in Italian. 64Jei: W. Jeitschko, H. Nowotny, and F. Benesovsky, Monatsh. Chem., 94(4/5), 1040-1043 (1964) in German. 65Har: I.R. Harris and G.V. Raynor, J. Less-Common Met., 9, 7-19 (1965). 65Tsu: T. Tsuchida and W.E. Wallace, J. Chem. Phys., 43, 3811-3814 (1965). 66Dar: M. Dariel, Acta Crystallogr., 20(4), 586 (1966). 66Mor: J.L. Moriarty, J.E. Humphreys, R.O. Gordon, and N.C. Baenziger, Acta Crystallogr., 21(5), 840-841 (1966). 68Pal: A. Palenzona, J. Less-Common Met., 16, 379-384 (1968). 69Bus: K.H.J. Buschow, H.W. De Wijn, and A.M. Van Diepen, J. Chem. Phys., 50(1) , 137-141 (1969). 80Del: S. Delfino, A. Saccone, and R. Ferro, Z. Metallkd., 71(3), 165-171 ( 1980). Submitted to the APD Program. Complete evaluation contains 1 figure, 3 tables, and 17 references. Special Points of the Ce-In System