Фазовая диаграмма системы Ba-Se

К оглавлению: Другие диаграммы (Others phase diargams)

Ba-Se (Barium-Selenium) H. Okamoto The assessed phase diagram for the Ba-Se system is based primarily on the data of [75Lys]. The equilibrium phases are (1) the liquid, L; (2) the bcc terminal phase, (Ba); (3) cubic NaCl-type BaSe; (4) Ba2Se3 with an unknown crystal structure, (5) monoclinic ThC2-type BaSe2; (6) tetragonal BaSe3; and (7) the hexagonal terminal phase, (gSe). The van't Hoff relation suggests that the initial slope of the (Ba) liquidus is -0.085 at.%/C, assuming no Se solubility in (Ba) and 7120 J/mol for the enthalpy of fusion of Ba. Therefore, the eutectic composition observed by [75Lys] indicates that the eutectic temperature must be 0.9/0.085 or about 10 C below the melting point of Ba, consistent with the observed value. 25Sla: M.K. Slattery, Phys. Rev., 25, 333-337 (1925). 26Gol: V.M. Goldschmidt, Skr. Norske Vindensp. Akad. Oslo, I. Mat. Natur. Kl., 8, 7-156 (1926). 60Mil: E. Miller, K. Komarek, and I. Cadoff, Trans. AIME, 218(12), 978-980 ( 1960). 75Lys: Yu.B. Lyskova and A.V. Vakhobov, Izv. Akad. Nauk SSSR, Neorg. Mater., 11(11), 2079-2080 (1975) in Russian; TR: Inorg. Mater., 11(11), 1784-1785 ( 1975). 77Koh: J. Kohle and T. Petzel, Z. Anorg. Chem., 437, 193-196 (1977) in German. 81Hul: F. Hulliger and T. Siegrist, Z. Naturforsch. B, 36, 14-15 (1981). Submitted to the APD Program. Complete evaluation contains 1 figure, 3 tables, and 6 references. Special Points of the Ba-Se System