Фазовая диаграмма системы Hg-Sb

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Hg-Sb (Mercury-Antimony) C. Guminski The assessed Hg-Sb phase diagram is derived essentially from [62Jan]. Although the prediction of [83Nie] would suggest a slight affinity of the elements for one another, no intermetallic compound was discovered in the Hg- Sb system by a direct synthesis. On the other hand, [62Uga] prepared an Hg3Sb2 compound by the chemical reaction between HgCl2 and SbH3. This compound had an unexpectedly low density of 6.0 g/cm3, but its structure was not investigated. A predominantly covalent bonding between Hg and Sb atoms was postulated. Thermal decomposition of Hg3Sb2 proceeded at approximately 400 C, even at 450 C in vacuum. These temperatures are inconsistent with the break on the liquidus at 200 C observed earlier by [62Jan]. The diffusion coefficient and the activity coefficient of Sb in liquid Hg suggest that Sb exists in the amalgam in an atomic form unbonded to Hg; this is the basis on which [89Gum1] proposed classifying Sb in the group of metals that do not form intermetallics with Hg [89Gum2]. The Hg3Sb2 compound may be considered as a metastable phase whose characterization requires further investigation. 62Uga: Ya.A. Ugai and V.L. Gordin, Zh. Neorg. Khim., 7, 703-705 (1962) in Russian. 62Jan: G. Jangg, F. Lihl, and E. Legler, Z. Metallkd., 53, 313-316 (1962) in German. 83Nie: A.K. Niessen, F.R. deBoer, R. Boom, P.F. deChѓtel, W.C.M. Mattens, and A.R. Miedema, Calphad, 7, 51-70 (1983). 89Gum1: C. Guminski, J. Mater. Sci. 24, 2661-2667 (1989). 89Gum2: C. Guminski, J. Mater. Sci., 24, 3285-3288 (1989). Published in Bull. Alloy Phase Diagrams, 11(4), Aug 1990. Complete evaluation contains 2 figures, 2 tables, and 21 references. 1