Фазовая диаграмма системы Be-Re

К оглавлению: Другие диаграммы (Others phase diargams)

Be-Re (Beryllium-Rhenium) H. Okamoto and L.E. Tanner In the assessed Be-Re phase diagram, the existence of two intermediate compounds, Be22Re and Be2Re, has been established [36Mis, 62Mat, 62San]. Additionally, Be16Re0.92 [84Mah] and Be6Re [59Pai] have been reported, but the boundaries are not well defined. Further studies are clearly needed. The liquidus trend reported by [58Bul] shows an unusual curvature and does not agree with the eutectic at ~0.45 at.% Re reported by [62Nag]. Furthermore, [ 58Bul] did not observe Be22Re (4.3 at.% Re), even at 5 at.% Re. Therefore, the evaluators suspect that the nominal compositions of [58Bul] are not reliable. The estimated solubility of Re in Be is 1 at.% [58Bul]. Much smaller values were reported by [62Nag]: <0.05 at.% at the eutectic temperature (unknown) and <0.03 at.% at 600 C. About 10 at.% Be is soluble in (Re), according to [58Bul] . The superconducting transition temperature of Be22Re is 9.67 K [65Buc] or 9.33 K [67Buc]. [67Ols] reported a similar temperature (9.5 K). [59Pai] found a phase of approximately Be6Re composition. There are no reports for a Be6X-type phase in any other systems with transition metals. Because the atomic ratio of Be6Re is close to that of Be17Os3 or Be17Re3, it is possible that this compound may be Be17Re3 (15 at.% Re). [80Tan] predicted the possible existence of a stable or metastable compound, BeRe, with either the CsCl- or CrB-type structure, from the study of a series of Be-transition metal systems. 36Mis: L. Misch, Metallwirtschaft, 15(6), 163-166 (1936) in German. 58Bul: V.N. Bulanov and I.N. Frantsevich, Vopr. Poroshkovoi Met. Prochnosti Mater., Akad. Nauk Ukr. SSR, 6, 32-35 (1958) in Russian. 58Hut: G.C. Huth and J.P. Smith, U.S. Atomic Energy Comm. DC-59-9-53, 8 p ( 1959). 59Pai: R.M. Paine, A.J. Stonehouse, and W.W. Beaver, WADC Tech. Rept., Part I, 266 p (1959). 60Pai: R.M. Paine and J.A. Carrabine, Acta Crystallogr., 13(8), 680-681 (1960). 62Mat: N.N. Matyushenko, L.F. Verkhorobin, N.S. Pugachev, and N.V. Sivokon, Kristallografiya, 7(6), 862-864 (1962) in Russian; TR: Sov. Phys. Crystallogr., 7(6), 701-703 (1963). 62Nag: N.D. Nagorskaya, V.V. Nikolaeva, A.V. Novoselova, I.N. Fridlyander, K.P. Yatsenko, and A.P. Savostin, in Renii, Akad. Nauk SSSR, Inst. Met., Proceedings, 2nd All-Union Conference (1962), Izd. Nauka, Moscow, 172-175 ( 1964) in Russian. 62San: D.E. Sands, Q.C. Johnson, A. Zalkin, O.H. Krikorian, and K.L. Kromholtz, Acta Crystallogr., 15(9), 832-834 (1962). 65Buc: E. Bucher, F. Heiniger, J. Muller, and P. Spitzli, Phys. Lett., 19, 263- 264 (1965). 67Buc: E. Bucher and C. Palmy, Phys. Lett. A, 24(7), 340-341 (1967). 67Ols: C.E. Olsen, B.T. Matthias, and H.H. Hill, Z. Phys., 200, 7-12 (1967). 80Tan: L.E. Tanner, Acta. Metall., 28(12), 1805-1816 (1980). 84Mah: M.C. Mahar and D.M. Collins, Acta Crystallogr. C, 40, 912-913 (1984). Published in Phase Diagrams of Binary Beryllium Alloys, 1987. Complete evaluation contains 1 figure, 3 tables, and 14 references. 1