Фазовая диаграмма системы In-Tb

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In-Tb (Indium-Terbium) H. Okamoto The assessed Tb-In phase diagram is based primarily on the analyses of [81Sha], with review of the experimental data of [74Die]. The accuracy of the temperature scale may be no better than с5 C, because all quoted temperatures in [81Sha] are rounded to the nearest 10 C. The diagram of [81Sha] has been slightly modified at several points in the assessed diagram to avoid unusual features in the originally proposed diagram. Regarding TbIn, the liquidus trend around the melting point appears to indicate that the composition of the congruent melting is displaced by a few atomic percent to the rare earth element side, as in the nearly equiatomic compounds of the Sm-In or Nd-In systems. Further studies may be needed for more details. The L = TbIn + Tb3In5 eutectic temperature is 1130 C. The eutectic composition was shown closer to TbIn in [81Sha], although the melting point of TbIn is very much higher than that of Tb3In5 (130 and 10 C above the eutectic temperature, respectively). Because no homogeneity range is known in Tb3In5, the eutectic composition is shown close to the composition of Tb3In5 in the assessed diagram for consistency. The phase relationships near the eutectic point need further clarification. The solubility of Tb in liquid In was measured by [74Die] between 400 and 500 C: log C = 0.329 - 807/T, where C is in at.% Nd and T is in K. According to this expression, the eutectic composition is 99.972 at.% In. Therefore, the eutectic composition must be very close to 100 at.% In. The assessed diagram shows that the solubility of Tb in (In) is negligible, and the eutectic temperature is only slightly lower than the melting point of In. The N‚el temperature of TbIn is 190 K [64Cab]. The N‚el temperature of TbIn3 is 36 K [69Bus] or 37 с 1 K [70Ner]. 64Cab: J.W. Cable, W.C. Koehler, and E.O. Wollan, Phys. Rev., 136(1), A240- A242 (1964). 64Kuz: Yu.B. Kuz'ma and V.Ya. Markiv, Kristallografiya, 9(2), 279-280 (1964) in Russian; TR: Sov. Phys. Crystallogr., 9(2), 218-220 (1964). 65Har: I.R. Harris and G.V. Raynor, J. Less-Common Met., 9, 7-19 (1965). 66Mor: J.L. Moriarty, J.E. Humphreys, R.O. Gordon, and N.C. Baenziger, Acta Crystallogr., 21, 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). 70Ner: N. Nereson and G. Arnold, J. Chem. Phys., 53(7), 2818-2823 (1970). 74Die: E.N. Dieva, Physicochemical Studies of Liquid Metals and Alloys, V.G. Bamburov, Ed., Izd. Ural'sk. Nauch. Tsentra Akad. Nauk SSSR, Sverdlovsk, 98- 104 (1974). 74Fra: E. Franceschi, J. Less-Common Met., 37(1), 157-160 (1974). 76Let: P. Lethuillier and A. Percherron-Guegan, J. Less-Common Met., 46(1), 85- 89 (1976). 81Del: S. Delfino, A. Saccone, D. Mazzone, and R. Ferro, J. Less-Common Met., 81(1), 45-53 (1981). 81Sha: Kh.O. Shakarov, A.A. Semyannikov, S.P. Yatsenko, and O.K. Kuvandykov, Izv. Akad. Nauk SSSR, Met., (2), 243-247 (1981) in Russian; TR: Russ. Metall., (2), 206-210 (1981). Submitted to the APD Program. Complete evaluation contains 1 figure, 3 tables, and 15 references. Special Points of the Tb-In System