Фазовая диаграмма системы Hg-Ho

К оглавлению: Другие диаграммы (Others phase diargams)


Hg-Ho (Mercury-Holmium) C. Guminski The hypothetical Ho-Hg phase diagram at constrained vapor pressure is based on [Moffatt], who presumed its similarity to the La-Hg and Pr-Hg partial phase diagrams. Discordant opinions have been expressed on the existence of HoHg4. [79Ian] claimed HoHg4 formation, but no experimental basis was given. [66Kir] and [ 79Mer] did not observe its formation on the XRD patterns of an amalgam of the proper composition. HoHg4 is probably stable below 150 C; using the preparation method of [79Mer] at higher temperatures, such a compound could not be formed. During preparation of Ho amalgam by cementation of a Ho(III) solution with Na amalgam at room temperature, [77Bul] observed precipitation of easily wetted HoHg microcrystals that floated on the liquid surface, instead of HoHg4 or even HoHg3. 64Kir: H.R. Kirchmayr, Monatsh. Chem., 95, 1667-1670 (1964) in German. 65Ian: A. Iandelli and A. Palenzona, J. Less-Common Met., 9, 1-6 (1965). 66Pal: A. Palenzona, J. Less-Common Met., 10, 290-292 (1966). 66Kir: H.R. Kirchmayr and W. Lugscheider, Z. Metallkd., 57, 725-729 (1966) in German. 68Ian: A. Iandelli and A. Palenzona, J. Less-Common Met., 15, 273-284 (1968). 77Bul: V.A. Bulina, A.T. Zebreva, and R.Sh. Enikeev, Izv. V.U.Z. Khim. Khim. Tekhnol., 20, 522-524 (1977) in Russian. 79Ian: A. Iandelli and A. Palenzona, Handbook on 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 11 references. Special Points of the Ho-Hg System