Фазовая диаграмма системы Co-U

К оглавлению: Другие диаграммы (Others phase diargams)


Co-U (Cobalt-Uranium) K. Ishida and T. Nishizawa The assessed Co-U phase diagram is based primarily on [56Wal], with review of the data of [79Dre]. The equilibrium phases are (1) the liquid, L; (2) the Co- rich fcc terminal solid solution, (aCo), with negligible solid solubility of U; (3) the Co-rich cph terminal solid solution, (eCo); (4) the hexagonal intermediate phase, Co11U2, stable up to the congruent melting temperature of ~1130 C; (5) Co4U, with an unknown crystal structure, stable up to ~1120 C; ( 6) the rhombohedral compound, Co3U, stable up to the peritectoid temperature of ~830 C; (7) the fcc phase, Co2U, with a homogeneity range from 27 to 33 at. % U, stable up to the congruent temperature of 1185 C [79Dre]; (8) the bcc compound, CoU, stable up to the peritectic temperature of 805 C; (9) the tetragonal intermediate compound, CoU6, stable up to the peritectic temperature of 826 C; (10) the bcc terminal solid solution, (gU), with a maximum solid solubility of 1.6 at.% Co; (11) the tetragonal solid solution, ( bU); and (12) the orthorhombic terminal solid solution, (aU), with negligible solid solubility of Co. The magnetic properties of Co2U have been studied by [75Ple] and [78Mes]. The Co2U compound is paramagnetic, and the susceptibility is independent of temperature [78Mes]. Co11U2 is ferromagnetic, and the Curie temperature has been reported as 87 C [76Der] and 116 C [77Yer]. CoU6 exhibits superconductivity below the transition temperature of 2.4 K [68Hil] or ~2 K [ 75Eng]. 56Wal: M.B. Waldron and J.D. Brown, Atomic Energy Research Establishment (1956) quoted in [Elliott]. 63Pet: G. Petzow, S. Steeb, and G. Kiessler, Z. Metallkd., 54, 473-477 (1963) in German. 68Dwi: A.E. Dwight, Acta Crystallogr. B, 24, 1395-1396 (1968). 68Hil: H.H. Hill and B.T. Matthias, Phys. Rev., 168, 464-474 (1968). 75Eng: J.J. Engelhardt, J. Phys. Chem. Solids, 36, 123-126 (1975). 75Ple: V.A. Pletyushkin, V.I. Chechernikov, V.V. Muzaleva, V.A. Semenov, R.N. Kuzmin, and V.K. Slovyanskikh, Fiz. Met. Metalloved., 39(1), 217-220 (1975) in Russian; TR: Phys. Met. Metallogr., 39(1), 200-203 (1975). 76Der: A.V. Deryagin and A.V. Andreev, Zh. Eksp. Teor. Fiz., 71, 1166-1171 ( 1976) in Russian; TR: Sov. Phys. JETP, 44, 610-613 (1976). 77Yer: A.S. Yermolenko, A.V. Ivanov, V.Y. Komarov, L.M. Magat, G.M. Makarova, and Y.S. Shur, Fiz. Met. Metalloved., 43(2), 446-448 (1977) in Russian; TR: Phys. Met. Metallogr., 43(2), 195-197 (1977). 78Mes: A.I. Meskhishvili, V.A. Peltyushkin, V.K. Slovyanskikh, V.I. Chechernikov, and T.M. Shaviskvili, Fiz. Met. Metalloved., 45(5), 935-939 ( 1978) in Russian; TR: Phys. Met. Metallogr., 43(2), 30-34 (1978). 79Dre: W. Dreizler, F. Aldinger, and G. Petzow, Z. Metallkd., 70, 769-774 ( 1979) in German. 83Nis: T. Nishizawa and K. Ishida, Bull. Alloy Phase Diagrams, 4, 387-390 ( 1983). Submitted to the APD Program. Complete evaluation contains 1 figure, 2 tables, and 14 references. 1