Фазовая диаграмма системы Bi-Tl

К оглавлению: Другие диаграммы (Others phase diargams)


Bi-Tl (Bismuth-Thallium) H. Okamoto The Bi-Tl phase diagram is adopted primarily from [70Pre], which was partly based on and in good agreement with [06Chi], [12Kur], and [34Ola]. The equilibrium phases in the assessed phase diagram are (1) the liquid, L; (2) ( aBi); (3) AlB2-type d, with a maximum homogeneity range of 31 to 46 at.% Tl; ( 4) disordered fcc-type a, with a maximum homogeneity range of 60 to 95 at.% Tl; (5) hexagonal BiTl3 in the composition range 70 to 77 at.% Tl; and (6) bcc and cph terminal solid solutions, (bTl) and (aTl), with ~5 and ~1 at.% Bi solid solubility ranges, respectively. Electrical properties indicate ~0.01 at.% Tl solubility in (aBi) [55Iva]. Disordered fcc a can be retained when quenched to liquid nitrogen temperature [ 79Mat]. When heated above about 200 K (-73 C), it transforms to an ordered fcc phase. This ordered phase is probably metastable, because it transforms irreversibly to a stable cph phase on further heating to about room temperature. [74Goe], on the other hand, found an order-disorder transition of fcc a to AuCu3-type structure at 94 C for 70.43 at.% Tl and at 73 C for 75 at.% Tl. Therefore, it is not clear whether the ordered cubic phase is stable at low temperatures. [70Ton] found a high-pressure phase (Bi2Tl) at 1 and 1.6 GPa. Electrical resistance measurements indicated that BiTl7 exists under high hydrostatic pressures [55Bri]. 06Chi: M. Chikashige, Z. Anorg. Chem., 51, 328-335 (1906) in German. 12Kur: N.S. Kurnakov, S.F. Zemczuzny, and V. Tararin, J. Russ. Phys. Chem. Soc. , 45, 300-329 (1912) in Russian; Z. Anorg. Chem., 83, 200-227 (1913) in German. 34Ola: A. Olander, Z. Phys. Chem., A169, 260-268 (1934). 55Bri: P.W. Bridgman, Proc. Am. Acad. Arts Sci., 84, 1-42 (1955). 55Iva: G.A. Ivanov and A.R. Regel, Zh. Tekh. Fiz., 25, 39-48 (1955). 70Pre: B. Predel and W. Schwermann, Z. Metallkd., 61(8), 585-591 (1970) in German. 70Ton: Ye.Yu. Tonkov and I.L. Aptekar, Fiz. Met. Metalloved., 29(1), 202-204 ( 1970) in Russian; TR: Phys. Met. Metallogr. (USSR), 29(1), 212-214 (1970). 74Goe: J.K. Goel, Trans. Indian Inst. Met., 27(1), 8-13 (1974). 79Mat: T. Matsuda, Trans. Jpn. Inst. Met., 20(12), 742-750 (1979). Submitted to the APD Program. Complete evaluation contains 4 figures, 3 tables, and 50 references. 1