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Encyclopedia > Mercury selenide

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 [20601-83-6][1]. General Name, Symbol, Number mercury, Hg, 80 Chemical series transition metals Group, Period, Block 12, 6, d Appearance silvery white Atomic mass 200. ... SE redirects here. ... It has been suggested that crystallization processes be merged into this article or section. ... Together with the metals and nonmetals, the metalloids (in Greek metallon = metal and eidos = sort - also called semimetals) form one of the three categories of chemical elements as classified by ionization and bonding properties. ... Lattice constant, or a, defines the distance between atoms in crystal lattice. ...


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. Tiemannite is a mineral, mercury selenide, formula HgSe. ...


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

Contents


Properties

Density (symbol: ρ - Greek: rho) is a measure of mass per unit of volume. ... The molecular mass of a substance (less accurately called molecular weight and abbreviated as MW) is the mass of one molecule of that substance, relative to the unified atomic mass unit u (equal to 1/12 the mass of one atom of carbon-12). ... In crystallography, a crystallographic point group or crystal class is a set of symmetry operations that leave a point fixed, like rotations or reflections, which leave the crystal unchanged. ... In materials science, hardness is the characteristic of a solid material expressing its resistance to permanent deformation. ... In physics, electron mobility (or simply, mobility), is used to describe the relation between drift velocity of electrons or holes in a solid material or electrons/ions in a gas, and an applied electric field. ... The specific heat capacity (the symbol c or s, also called specific heat or SHC) of a substance is defined as heat capacity per unit mass. ... In physics, thermal conductivity, k, is the intensive property of a material that indicates its ability to conduct heat. ... The melting point of a solid is the temperature at which it changes state from solid to liquid. ... The standard enthalpy of formation of a compound is the change of enthalpy that accompanies the formation of 1 mole of that substance from its component elements, at their standard states (the most stable form of the element at 25 degrees Celsius and 100 kilopascals). ...

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.

Zinc oxide is a chemical compound with formula ZnO. It is nearly insoluble in water but soluble in acids or alkalis. ...

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. However, a reaction between mercury compounds and selenium compounds in the body can lead to selenium deficiency. Mercury poisoning, also known as mercuralism, is the phenomenon of toxication by contact with mercury. ... Flash point  ?°C R/S statement R: , , S: ? RTECS number X1050000 Supplementary data page Structure and properties n, εr, etc. ...


See also

Mercury Sulfide is a chemical compound composed of the elements Mercury and Sulfur. ... Mercury telluride (HgTe) is a binary chemical compound of mercury and tellurium. ... Cadmium selenide (CdSe) is a solid compound of cadmium and selenium. ... Zinc selenide (ZnSe), is a light yellow binary solid compound. ...

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.

A digital object identifier (or DOI) is a permanent identifier (permalink) given to a World Wide Web file or other Internet document so that if its Internet address changes, users will be redirected to its new address. ... A digital object identifier (or DOI) is a permanent identifier (permalink) given to a World Wide Web file or other Internet document so that if its Internet address changes, users will be redirected to its new address. ... A digital object identifier (or DOI) is a permanent identifier (permalink) given to a World Wide Web file or other Internet document so that if its Internet address changes, users will be redirected to its new address. ... A digital object identifier (or DOI) is a permanent identifier (permalink) given to a World Wide Web file or other Internet document so that if its Internet address changes, users will be redirected to its new address. ...

External links

  • http://ctdp.ensmp.fr/species/Tiemannite.html
  • List of related Hg chalcogenides
  • Fiz Chemie Berlin thermophysical database entry

 
 

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