Фазовая диаграмма системы Be-Ge

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Be-Ge (Beryllium-Germanium) H. Okamoto and L.E. Tanner The assessed phase diagram for the Be-Ge system is adopted from [81Mol]. A wide range of liquid immiscibility exists. The melting point of bBe and the bBe = aBe allotropic transformation temperature are 1289 с 5 and 1270 с 6 C, respectively [Melt]. The melting point of Ge is 938.3 C [Melt]. [46Ray] predicted the existence of an intermetallic compound by considering the electrochemical properties of Be and Ge. [50Kau] reported that a compound phase was present in a 1.4 at.% Ge alloy slowly cooled from the melt. However, examinations by [60Yan] on a 10 at.% Ge cast alloy indicated the presence of only the terminal phases. [60Yan] concluded that intermetallic compounds, if formed, were stable only at high temperatures. [59Las] estimated the maximum solubility of Be in (Ge) to be 1019 atoms/cm3 (i. e., 0.023 at.% Be by assuming that the density of Ge is 5.3267 g/cm3). [67She] reported that the solubility was at least 109 atoms/cm3, because they could prepare this alloy composition by using zone-refining techniques. The equilibrium solubility of Be in (Ge) as a function of temperature is still unknown. 46Ray: G.V. Raynor, J. Roy. Aeronaut. Soc., 50, 410 (1946). 50Kau: A.R. Kaufmann, P. Gordon, and D.W. Lillie, Trans. ASM, 42, 785-844 ( 1950). 59Las: V.E. Lashkarev, R.N. Bondarenko, V.M. Dorovol'skii, G.P. Zubrin, V.G. Litovchenko, and V.I. Strikha, Ukr. Fiz. Zh., 4, 372-375 (1959) in Russian. 60Yan: F.M. Yans, U.S. At. Energy Comm. NMI-1240, 41 p (1960). 67She: H. Shenker, E.M. Swiggard, and W.J. Moore, Trans. AIME, 239, 347-349 ( 1967). 81Mol: L.V. Molchanova, E.T. Kabeshova, and G. Abdulaev, Vestn. Moskov Univ. Ser. 2, Khim., 22, 308-311 (1981) in Russian. Published in Phase Diagrams of Binary Beryllium Alloys, 1987. Complete evaluation contains 1 figure, 1 table, and 7 references. 1