Mercury(II) selenide

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Mercury(II) selenide
Mercury(II) selenide unit cell
Identifiers
CAS number [20601-83-6]
Properties
Molecular formula HgSe
Molar mass 279.55 g/mol
Density 8300 kg.m-3
Melting point

1270 K
Thermochemistry
Std enthalpy of
formation ΔfHo298		 247 kJ.mol-1
Specific heat capacity, C 178 J.kg-1.K-1
Except where noted otherwise, data are given for
materials in their standard state
(at 25 °C, 100 kPa)
Infobox references

Mercury selenide (HgSe) is a chemical compound of mercury and selenium. It is a grey-black crystalline solid semi-metal with a sphalerite structure. The lattice constant is 0.608 nm.

Mercury selenide can also refer to the following chemical compounds: HgSe2 and HgSe8. HgSe is strictly mercury(II) selenide.

HgSe occurs naturally as the mineral Tiemannite.

Along with other II-VI compounds, colloidal nanocrystals of HgSe can be formed.

Contents

Applications

  • Selenium is used in filters in some steel plants to remove mercury from exhaust gases. The solid product formed is HgSe.
  • HgSe can be used as an ohmic contact to wide-gap II-VI semconductors such as zinc selenide or zinc oxide.

Toxicity

HgSe is toxic due to the mercury content (see mercury poisoning). Toxic hydrogen selenide fumes can be evolved on exposure to acids. HgSe is a relatively stable compound which might mean that it is less toxic than elemental mercury or many organometallic mercury compounds.

See also

References

 The references used in this article may be clearer with a different or consistent style of citation, footnoting, or external linking. (September 2007)
  • Resonant Phonon Scattering in Mercury Selenide, Donald A. Nelson, J. G. Broerman, E. C. Paxhia, and Charles R. Whitsett, Phys. Rev. Lett. vol. 22, pp. 884–887 (1969) doi:10.1103/PhysRevLett.22.884
  • Melting and Polymorphic Transitions for Some Group II-VI Compounds at High Pressures, A. Jayaraman, W. Klement, Jr., and G. C. Kennedy, Phys. Rev. vol. 130, pp. 2277–2283 (1963) doi:10.1103/PhysRev.130.2277
  • HgSe: Metal or Semiconductor?, K.-U. Gawlik, L. Kipp, and M. Skibowski, N. Orłowski and R. Manzke, Phys. Rev. Lett. vol. 78, pp. 3165–3168 (1997) doi:10.1103/PhysRevLett.78.3165.
  • Dielectric properties of narrow-gap semiconductors, K. Kumazaki, Journal of Crystal Growth Volume 101, Issues 1-4 pages 687-690 (1990) doi:10.1016/0022-0248(90)91059-Y
  • SNV (1991) Guidelines on measures and methods for heavy metal emissions control. Solna, The Swedish Environmental Protection Agency – Naturvårdsverket.

External links

Wikipedia content modification information:

  • This page was last modified on 27 June 2008, at 22:17.

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