Mercury(II) selenide

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Name = Mercury(II) selenide
ImageFile = Mercury(II)-selenide-unit-cell-3D-ionic.png ImageName = Mercury(II) selenide unit cell
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CASNo = 20601-83-6
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Formula = HgSe
MolarMass = 279.55 g/mol
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Density = 8300 kg.m^-3
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MeltingPt = 1270 K
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DeltaHf = 247 kJ.mol^-1
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HeatCapacity = 178 J.kg^-1.K^-1

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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.

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.

ee also

* Mercury sulfide
* Mercury telluride
* Cadmium selenide
* Zinc selenide

References

* 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

* http://ctdp.ensmp.fr/species/Tiemannite.html
* [http://lb.chemie.uni-hamburg.de/static/data2/87_cyv2t5sk.html List of related Hg chalcogenides]