Mercury(II) selenide
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| Mercury(II) selenide | |
|---|---|
| Image:Mercury(II) selenide.jpg | |
| General | |
| Systematic name | ? |
| Other names | ? |
| Molecular formula | ? |
| SMILES | ? |
| Molar mass | ?.?? g/mol |
| Appearance | ? |
| CAS number | [?-?-?] |
| Properties | |
| Density and phase | ? g/cm3, ? |
| Solubility in water | ? g/100 ml (?°C) |
| Melting point | ?°C (? K) |
| Boiling point | ?°C (? K) |
| Acidity (pKa) | ? |
| Basicity (pKb) | ? |
| Chiral rotation [α]D | ?° |
| Viscosity | ? cP at ?°C |
| Structure | |
| Molecular shape | ? |
| Coordination geometry |
? |
| Crystal structure | ? |
| Dipole moment | ? D |
| Hazards | |
| MSDS | External MSDS |
| Main hazards | ? |
| NFPA 704 | |
| Flash point | ?°C |
| R/S statement | R: ? S: ? |
| RTECS number | ? |
| Supplementary data page | |
| Structure and properties |
n, εr, etc. |
| Thermodynamic data |
Phase behaviour Solid, liquid, gas |
| Spectral data | UV, IR, NMR, MS |
| Related compounds | |
| Other anions | ? |
| Other cations | ? |
| Related ? | ? |
| Related compounds | ? |
| Except where noted otherwise, data are given for materials in their standard state (at 25°C, 100 kPa) Infobox disclaimer and references |
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Mercury selenide (HgSe) is a chemical compound of mercury and selenium. It is a a grey-black crystalline solid semi-metal with a sphalerite structure. The lattice constant is 0.608 nm. The CAS number is [].
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 |
[edit] Properties
- Density 8300 kg.m-3
- Molecular Weight 279.55 g.mol-1
- Crystal class -43m
- Hardness 2.5 Mohs
- Electron mobility, 2.0 m².V-1.s-1
- Coefficient of linear expansion 5.46 x10-6 K-1
- Specific heat capacity 178 J.kg-1.K-1
- Thermal conductivity 1 W.m-1.K-1
- Melting point 1270 K
- Enthalpy of Formation 247 kJ.mol-1
- Debye temperature 151 K
[edit] 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.
[edit] 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.
[edit] See also
[edit] 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.
