Zinc selenide

Zinc selenide

Chembox new
Name = Zinc selenide
ImageFile = Zinc-selenide-unit-cell-3D-balls.png ImageName = Zinc selenide
OtherNames = zinc(II) selenide
Section1 = Chembox Identifiers
CASNo = 1315-09-9

Section2 = Chembox Properties
Formula = ZnSe
MolarMass = 144.35 g/mol
Appearance = light yellow solid
Density = 5.27 g/cm3, solid
Solubility = Insoluble
MeltingPt = 1525 °C
BoilingPt = °C

Section4 = Chembox Thermochemistry
DeltaHf = −177.6 kJ/mol
Entropy = ???? J.K−1.mol−1

Section7 = Chembox Hazards
ExternalMSDS = [http://physchem.ox.ac.uk/MSDS/ZI/zinc_selenide.html Oxford University Safety Data]
EUClass = Dangerous for
the environment (N)
RPhrases = R20 R22 R36 R38 R23/R25 R33
SPhrases =

Section8 = Chembox Related
OtherAnions = Zinc sulfide
Zinc oxide
Zinc telluride
OtherCations = Cadmium selenide
Mercury selenide

Zinc selenide (ZnSe), is a light yellow binary solid compound. It is an intrinsic semiconductor with a band gap of about 2.7 eV at 25 °C. It has a standard enthalpy of formation of 177.6 kJ/mol at 25 °C. It adopts a zincblende lattice structure with lattice constant a=566.8 picometers.

ZnSe rarely occurs in nature. It is found in the mineral stilleite named after Hans Stille.

Applications

* ZnSe is used to form II-VI light-emitting diodes and diode lasers. It emits blue light. It is susceptible to n-type doping with, for instance, halogen elements. P-type doping is more difficult, but can be achieved by introducing nitrogen.
* ZnSe doped with chromium (ZnSe:Cr) has been used as an infrared laser gain medium emitting at about 2.5 µm. [Cr2+ excitation levels in ZnSe and ZnS, G. Grebe, G. Roussos and H.-J. Schulz, J. Phys. C: Solid State Phys. vol. 9 pp. 4511-4516 (1976) doi|10.1088/0022-3719/9/24/020]
* It is used as an infrared optical material with a remarkably wide transmission wavelength range (0.6 µm to 20 µm). The refractive index is about 2.67 at 550 nm (green), and about 2.40 at 10.6 µm (LWIR). ZnSe is produced as microcrystalline sheets by synthesis from H2Se gas and zinc vapour. Lasertran (trademark of Rohm & Haas) grade is especially free of absorption and inclusions and is used particularly for CO2 laser optics at 10.6 micrometres wavelength. It is thus a very important IR material. In daily life, it can be found as the entrance optic in the new range of "in-ear" clinical thermometers and can be just seen as a small yellow window. Zinc selenide can slowly react with atmospheric moisture if poorly polished, but this is not generally a serious problem. Except where optics are use in spectroscopy or at the brewster angle, antireflection or beamsplitting coatings are generally employed.
*Fragile, breaks easily.

* ZnSe doped with tellurium (ZnSe(Te)) is a scintillator with emission peak at 640 nm, suitable for matching with photodiodes. It is used in x-ray and gamma ray detectors. ZnSe scintillators are significantly different from the ZnS ones.

Chemistry

ZnSe reacts with acids to form toxic hydrogen selenide gas.

It is formed by chemical vapour deposition techniques including MOVPE.

ee also

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

References

External links

* [http://www.iiviinfrared.com/products/materials_znse.html II-VI - INFRARED] optical data & more

* [http://www.irfilters.reading.ac.uk/library/technical_data/infrared_materials/znse.htm Reading University] optical data


Wikimedia Foundation. 2010.

Игры ⚽ Нужно сделать НИР?

Look at other dictionaries:

  • Zinc oxide — Other names Zinc white Calamine Identifiers …   Wikipedia

  • Zinc telluride — Chembox new Name = Zinc telluride ImageFile = Zinc selenide unit cell 3D balls.png OtherNames = Section1 = Chembox Identifiers CASNo = 1315 11 3 Section2 = Chembox Properties Formula = ZnTe MolarMass = 192.99 g/mol Appearance = red crystals… …   Wikipedia

  • Zinc sulfide — Chembox new Name = Zinc sulfide ImageFile = Sphalerite unit cell 3D balls.png ImageSize = 150px ImageName = Sphalerite, the more common polymorph of zinc sulfide ImageFile1 = Wurtzite unit cell 3D balls.png ImageSize1 = 150px ImageName1 =… …   Wikipedia

  • Mercury selenide — Mercury(II) selenide IUPAC name Mercury selenide …   Wikipedia

  • Mercury(II) selenide — Chembox new Name = Mercury(II) selenide ImageFile = Mercury(II) selenide unit cell 3D ionic.png ImageName = Mercury(II) selenide unit cell IUPACName = OtherNames = Section1 = Chembox Identifiers SMILES = CASNo = 20601 83 6 RTECS = Section2 =… …   Wikipedia

  • Cadmium selenide — Chembox new Name = Cadmium selenide IUPACName = Cadmium selenide OtherNames = Cadmium(II) selenide Cadmoselite Section1 = Chembox Identifiers CASNo = 1306 24 7 SMILES = Cd=Se Section2 = Chembox Properties Formula = CdSe MolarMass = 191.37 g/mol… …   Wikipedia

  • Compounds of zinc — are chemical compounds containing the element zinc which is a member of the group 12 of the periodic table. The oxidation state of most compounds is the group oxidation state of +2. Zinc may be classified as a post transition main group element… …   Wikipedia

  • Dictionary of chemical formulas — This is a list of chemical compounds with chemical formulas and CAS numbers, indexed by formula. This complements alternative listings to be found at list of inorganic compounds, list of organic compounds and inorganic compounds by element. Table …   Wikipedia

  • List of inorganic compounds — Tentative listing related to this page, inorganic compounds by element (presently under construction), as well as . This list is not necessarily complete or up to date ndash; if you see an article that should be here but isn t (or one that… …   Wikipedia

  • List of semiconductor materials — Semiconductor materials are insulators at absolute zero temperature that conduct electricity in a limited way at room temperature (see also Semiconductor). The defining property of a semiconductor material is that it can be doped with impurities… …   Wikipedia

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”