Фазовая диаграмма системы Dy-Hg

К оглавлению: Другие диаграммы (Others phase diargams)


Dy-Hg (Dysprosium-Mercury) C. Guminski The assessed Dy-Hg phase diagram at constrained vapor pressure, which is speculative, is based on [Moffatt], who presumed similarity to the Hg-La and Hg-Pr partial phase diagrams. Stability ranges of the Dy-Hg compounds at normal pressure are drawn with continuous lines and were taken from [66Kir]. The equilibrium phases are (1) the liquid, L, (2) the solid solutions of Hg in (aDy), (bDy), and (a›Dy), (3) four intermetallic compounds: DyHg4, DyHg3, DyHg2, and DyHg, with homogeneity ranges lower than 5 at.% Hg; and (4) (Hg), with low solid solubility of Dy. The solubility of Hg in (aDy) seems to be several atomic percent at ~700 C, whereas the solubility of Hg in (a›Dy) is likely to be very small. [79Ian] reported the formation of DyHg4, but no experimental basis was reported. [66Kir] and [79Mer] did not observe its formation on XRD patterns of the amalgam at the DyHg4 composition. If formed, DyHg4 would be stable below 150 C, so its preparation at higher temperatures [79Mer] was not possible. 59Ato: M. Atoji, J.E. Schirber, and C.A. Swenson, J. Chem. Phys., 31, 1628- 1629 (1959). 64Kir: H.R. Kirchmayr, Monatsh. Chem., 95, 1667-1670 (1964). 64Lau: E. Laube and J.B. Kusma, Monatsh. Chem., 95, 1504-1513 (1964) in German. 65Ian: A. Iandelli and A. Palenzona, J. Less-Common Met., 9, 1-6 (1965). 66Kir: H.R. Kirchmayr and W. Lugscheider, Z. Metallkd., 57, 725-728 (1966) in German. 66Pal: A. Palenzona, J. Less-Common Met., 10, 290-292 (1966). 68Ian: A. Iandelli and A. Palenzona, J. Less-Common Met., 15, 273-284 (1968). 79Ian: A. Iandelli and A. Palenzona, Handbook of the Physics and Chemistry of Rare Earths, K.A. Gschneidner and L. Eyring, Ed., North-Holland, Amsterdam, 1- 54 (1979). 79Mer: F. Merlo and M.L. Fornasini, J. Less-Common Met., 64, 221-231 (1979). Submitted to the APD Program. Complete evaluation contains 1 figure, 3 tables, and 14 references. Special Points of the Dy-Hg System