Фазовая диаграмма системы Gd-Sn

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Gd-Sn (Gadolinium-Tin) A. Palenzona and S. Cirafici The assessed Gd-Sn phase diagram is based primarily on the work of [84Liu] with some changes. The melting points of Gd and Sn and their transformation temperatures were modified to agree with the currently accepted values. The equilibrium phases include (1) the liquid, L; (2) ten intermediate phases- Gd3Sn, Gd5Sn3, Gd5Sn4, Gd8Sn7, Gd11Sn10, Gd3Sn4, GdSn2, Gd3Sn7, GdSn2.75, and GdSn3; and (3) four terminal solid solutions-(aSn), (bSn), (aGd), and (bGd), with negligible solubilities. No information is available regarding the solid solubility of Gd in (Sn) or Sn in (Gd). Concerning the Sn-rich side of the diagram, the experimental results of [85Kul] are not supported by satisfactory data regarding the purity of starting metals and experimental procedures. It was not specified by [85Kul] if the melting point of GdSn3 is congruent or incongruent, as also observed by [73Pal]; moreover, the value is 200 C higher than that found by [73Per] and [ 84Liu]. For this reason, the results of [84Liu] seem to be more reliable, and the value of the assessed melting point of GdSn3 is 910 C. The special points for Gd3Sn7 and GdSn2.75 are tentatively identified; the eutectic (?) reaction found by [84Liu] on the Sn-rich side is tentatively fixed at 231.9 C and >99 at.% Sn. 65Har: I.R. Harris and G.V. Raynor, J. Less-Common Met., 9, 7-19 (1965). 66Ian: A. Iandelli and A. Palenzona, Atti Accad. Naz. Lincei, Rend. Cl. Sci. Fis., Mat. Nat., 40, 623-628 (1966) in Italian. 66Pal: A. Palenzona and F. Merlo, Atti Accad. Naz. Lincei Rend. Cl. Sci. Fis., Mat. Nat., 40, 617-622 (1966) in Italian. 67Jei: W. Jeitschko and E. Parth‚, Acta Crystallogr., 22, 551-555 (1967). 71For: M.L. Fornasini and F. Merlo, Atti Accad. Naz. Lincei Rend. Cl. Sci. Fis. , Mat. Nat., 50, 30-40 (1971) in Italian. 72Bac: A. Bacha, C. Chatillon-Colinet, A. Percheron, and J-C. Mathieu, C.R. Acad. Sci. (Paris) C, 274, 680-683 (1972) in French. 73Pal: A. Palenzona, Thermochim. Acta, 5, 473-480 (1973). 73Per: A. Percheron-Guegan, J-C. Achard, A. Bacha, C. Chatillon and J-C. Mathieu, Proc. 10th Rare Earth Res. Conf., C.J. Kevane and T. Moeller, Ed., USAEC Technical Information Center, Oak Ridge, TN, 1046-1051 (1973) in French. 84Liu: J-Q. Liu and J-X. Zheng, Acta Phys. Sin. (China), 33, 1155-1159 (1984) in Chinese. 85Kul: I.G. Kulagina, A.P. Bayanov, and N.M. Kulagin, Izv. Akad. Nauk SSSR Met. , (3), 211-216 (1985) in Russian; TR: Russ. Metall., (3), 213-218 (1985). 86Sko: R.V. Skolozdra, L.G. Akselrud, V.K. Pecharskii, and O.E. Koretskaya, Dokl. Akad. Nauk. Ukr. RSR, Sez. B: Geol. Khim. Biol. Nauki, 12, 51-54 (1986) in Russian. Submitted to the APD Program. Complete evaluation contains 2 figures, 6 tables, and 16 references. Special Points of the Gd-Sn System