Фазовая диаграмма системы Hg-Te

К оглавлению: Другие диаграммы (Others phase diargams)


Hg-Te (Mercury-Tellurium) R.C. Sharma and Y.A. Chang The assessed Hg-Te phase diagram is based on thermodynamic modeling and calculations, with review of the data of [09Pel], [65Bre], [67Str], [71Dzi], [ 71Paj], and [80Har]. An essentially stoichiometric intermediate phase (aHgTe) is formed at 50 at.% Te; it melts congruently. There are two eutectic reactions-one each in the (Hg)-HgTe and HgTe-(Te) regions of the phase diagram. [63Abd] determined the solubility of Hg in (Te) from 217 to 440 C as follows: 0.003 at.% Hg at 270 C, 0.017 at.% Hg at 320 C, 0.54 at.% Hg at 340 C, 1.36 at.% Hg at 370 C, 1.25 at.% Hg at 390 C, 0.68 at.% Hg at 420 C, and 0.34 at.% Hg at 440 C. These data show a maximum solubility of ~1.36 at.% Hg at 370 C, ~40 C below the eutectic temperature (411 C), where the solubility should normally be maximum. This casts some doubts on the reliability of the data. In the assessed phase diagram, the maximum solubility of Hg in (Te) is therefore tentatively shown to be ~1 at.% Hg at the eutectic temperature, based on the above data, decreasing continuously below it. More accurate measurements on the solubility of Hg in (Te) are needed. The solubility of Te in solid (Hg) has not been determined experimentally, but is most likely to be negligible. aHgTe (B3 structure) transforms to bHgTe (B9 structure) at high pressures [ 61Bla, 63Jay, 63Mar]. The aHgTe-to-bHgTe transition pressure at room temperature is ~14 kbar [61Bla, 63Jay]. [63Jay] also determined the aHgTe-to- bHgTe transition pressure as a function of temperature up to ~200 C and the melting temperatures of aHgTe and bHgTe as a function of pressure. The L + aHgTe + bHgTe triple point is at about 12 kbar and 615 C [63Jay]. 09Pel: G. Pellini, R. Sacerdoti, and C. Aureggi, Atti Accad. Lincei, 18, 211- 217 (1909). 61Bla: J. Blair and A.C. Smith, Phys. Rev. Lett., 7(4), 124-125 (1961). 63Abd: G.B. Abdullaev, Sh. Movlanov, M.G. Shakhtahktinskii, and A.A. Kuliev, Izv. Akad. Nauk Tadzh. SSR, Otd. Geol.-Khim. Tekh. Nauk, 2, 13-22 (1963) in Russian. 63Jay: A. Jayaraman, W. Klement, and G.C. Kennedy, Phys. Rev., 130(6), 2277- 2283 (1963). 63Mar: A.N. Mariano and E.P. Warekois, Science, 142, 672-673 (1963). 65Bre: R.F. Brebrick and A.J. Strauss, J. Phys. Chem. Solids, 26, 989-1002 ( 1965). 67Str: A.J. Strauss, quoted as private communication in [82Tun]. 71Dzi: E.Z. Dziuba, J. Cryst. Growth, 8, 221-222 (1971). 71Paj: A. Pajaczkowska and E.Z. Dziuba, J. Cryst. Growth, 11, 21-24 (1971). 80Har: T.C. Harman, J. Electron. Mater., 9, 945-961 (1980). 82Tun: T. Tung, C. Su, P. Liao, and R.F. Brebrick, J. Vac. Sci. Technol., 21(1) , 117-124 (1982). Submitted to the APD Program. Complete evaluation contains 5 figures, 7 tables, and 31 references. Special Points of the Hg-Te System