Фазовая диаграмма системы Hg-V

К оглавлению: Другие диаграммы (Others phase diargams)


Hg-V (Mercury-Vanadium) J.F. Smith [32Irv] found a solubility at room temperature of 5 x 10-5 wt.% V in Hg (2 at. ppm). [64Par] is inconsistent with this initial result, in that the combination of the two sets of data shows a normal decreasing solubility with decreasing temperature at elevated temperatures changing to reversed solubility behavior with continuing decrease in temperature. Results from [ 64Par], as quoted in [Shunk], are 1.5 x 10-5 wt.% V in Hg (0.59 at.ppm) at 638 C and 0.4 x 10-5 wt.% (0.16 at.ppm) at 538 C. The latter two temperatures are above the normal boiling point of Hg (357 C), so these data from elevated temperatures are for measurements on a constrained system under pressure. A speculation as to the nature of the phase relationships in the Hg-V system has been made [69Sav] on the basis of a survey of the binary alloying behavior of V. This speculative diagram anticipated negligible solubility of Hg in both liquid and solid V and negligible solubility of V in liquid Hg, with mutual miscibility occurring only in the gas phase. These anticipations are in reasonable accord with the results of the calculated phase equilibria. The calculations indicate a room-temperature solubility of about 8 at.ppm for V in Hg, in better agreement with [32Irv] than with [64Par]. 32Irv: N.M. Irvin and A.S. Russell, J. Chem. Soc., 1932, 891-898 (1932). 64Par: M.F. Parkman, Extended Abstracts of Electrothermics and Metallurgy Division, Electrochemical Society, Fall Meeting, Washington, Abstract No. 177, 16-21, (1964); quoted in [Shunk]. 69Sav: E.M. Savitskii and Yu.V. Efimov, Planseeber. Pulvermetall., 17, 103-110 (1969) in German. Published in Phase Diagrams of Binary Vanadium Alloys, 1989. Complete evaluation contains 2 figures, 2 tables, and 7 references. Special Points of the Hg-V System