Фазовая диаграмма системы Bi-S

К оглавлению: Другие диаграммы (Others phase diargams)


Bi-S (Bismuth-Sulfur) J.-C. Lin, R.C. Sharma, and Y.A. Chang The Bi-S system is characterized by the presence of an intermediate compound, Bi2S3, which forms at 60 at.% S and melts congruently at 775 C. In the Bi- Bi2S3 region of the phase diagram, a eutectic occurs close to pure Bi; the Bi2S3-S region has a miscibility gap in the liquid, resulting in a monotectic reaction, and an eutectic close to pure S. The assessed Bi-S phase diagram is based on thermodynamic modeling of select experimental data [05Ate, 09Pel, 50Vog, 60Ura, 62Cub, 71Hap, 71Oka, 80Fuk] and calculations. Sulfur exists in two allotropic forms-(aS), stable up to 95.5 C and (bS) from 95.5 C to its melting point (115.2 C). The mutual solid solubilities of S and Bi in the solid state are negligible and have not been determined. [64Sil] reported the formation of a metastable BiS2 phase when a 4:11 atomic mixture of Bi and S was subjected to a pressure of 50 kbar at 1250 C for 5 to 10 min. Upon heating in a vacuum, BiS2 decomposed to Bi2S3 at around 300 C. 05Ate: A.H.W. Aten, Z. Anorg. Chem., 47, 386-398 (1905) in German. 09Pel: H. Pelabon, Ann. Chim. Phys., 17(8), 526-566 (1909) in French. 50Vog: R. Vogel and W. Massenhausen, Z. Metallkd., 41, 75-80 (1950) in German. 60Ura: G.G. Urazov, K.K. Bol'shakov, P.I. Fedorov, and I.I. Vasilevskaya, Zh. Neorg. Khim., 5, 630-636 (1960) in Russian; TR: Russ. J. Inorg. Chem., 5(3), 303-307 (1960). 62Cub: D. Cubicciotti, J. Phys. Chem., 66, 1205-1206 (1962). 64Sil: M.S. Silverman, Inorg. Chem., 3(7), 1041 (1964). 71Hap: J.V. Happ and T.R.A. Davey, Trans. Inst. Min. Met. C, 80, 190-191 (1971) . 71Oka: K. Okajima and H. Sakao, Trans. Jpn. Inst. Met., 12(6), 401-404 (1971). 80Fuk: N. Fukatsu, H. Mukai, and Z. Kozuka, Nippon Kinzoku Gakkaishi, 44(4), 412-419 (1980) in Japanese. Submitted to the APD Program. Complete evaluation contains 8 figures, 6 tables, and 23 references. Special Points of the Bi-S System