Selenide Znse

Activity series for anions?

If I have an ionic compound like zinc selenide, ZnSe, how can I get the selenium out of the compound as its elemental form?

Melting it and electrolyzing it would be one option - not sure how well it would work. The compound isn't really that ionic - it is a semiconductor with a fairly small band gap (2.82eV, corresponding to bluish light).

Roasting it in air or oxygen would produce zinc oxide and selenium dioxide. An analogous reaction is used to process zinc sulfide (ZnS, sphalerite), the main ore of zinc. The selenium dioxide could be reduced to form elemental selenium. One possible option is reacting it with hydrogen selenide.

Hydrogen selenide is a highly toxic, very foul smelling gas. It can be produced by reacting zinc selenide with an acid like HCl. This is very dangerous, and you should probably not attempt it. It could presumably react with selenium dioxide as follows:

2H2Se + SeO2 ----> 3Se + 2H2O

Lead Selenide $70.1 Lead selenide (PbSe), or lead(II) selenide, a selenide of lead, is a semiconductor material. It forms cubic crystals of the NaCl structure; it has a direct bandgap of 0.27 eV at room temperature. (Note that incorrectly identifies PbSe and other IVVI semiconductors as indirect gap materials.) It is a grey crystalline solid material. It is used for manufacture of infrared detectors for thermal imaging, operating at wavelengths between 1.55.2 ?m. It does not require cooling, but performs better at lower temperatures. The peak sensitivity depends on temperature and varies between 44.7 ?m. Author: Miller, Frederic P./ Vandome, Agnes F./ McBrewster, John Binding Type: Paperback Number of Pages: 80 Publication Date: 2010/07/26 Language: English Dimensions: 5.98 x 9.01 x 0.19 inches

Zinc Selenide $70.1 High Quality Content by WIKIPEDIA articles High Quality Content by WIKIPEDIA articles An intrinsic semiconductor, also called an undoped semiconductor or itype semiconductor, is a pure semiconductor without any significant dopant species present. The number of charge carriers is therefore determined by the properties of the material itself instead of the amount of impurities. In intrinsic semiconductors the number of excited electrons and the number of holes are equal: n = p. The conductivity of intrinsic semiconductors can be due to crystal defects or to thermal excitation. In an intrinsic semiconductor the number of electrons in the conduction band is equal to the number of holes in the valence band. An example is Hg0.8Cd0.2Te at room temperature. An indirect gap intrinsic semiconductor is one where the maximum energy of the valence band occurs at a different k kspace wave vector than the minimum energy of the conduction band. Examples include silicon and germanium. A direct gap intrinsic semiconductor is one where the maximum energy of the valence band occurs at the same k as the minimum energy of the conduction band. Examples include gallium arsenide. Author: Surhone, Lambert M./ Timpledon, Miriam T./ Marseken, Susan F. Binding Type: Paperback Number of Pages: 80 Publication Date: 2010/07/19 Language: English Dimensions: 6.00 x 9.00 x 0.19 inches

Nanoparticles of Cadmium Selenide Glow under Ultraviolet Light $39.99 Mark Thiessen Nanoparticles of Cadmium Selenide Glow under Ultraviolet Light - Photographic Print

Cigs Solar Cells : Nanosolar, Copper Indium Gallium Selenide, Heliovolt, Miasol, Solyndra, Ascent Solar, Q-Cells, Global Solar, Daystar $9.84 No Synopsis Available

Cadmium Compounds : Cadmium Sulfide, Mercury(ii) Cadmium(ii) Telluride, Cadmium Telluride, Cadmium Selenide, Cadmium Oxide, Cadmium Chloride $11.83 No Synopsis Available

Tiemannite $70.1 High Quality Content by WIKIPEDIA articles Tiemannite is a mineral, mercury selenide, formula HgSe. It occurs in hydrothermal veins associated with other selenides, or other mercury minerals such as cinnabar, and often with calcite. Discovered in 1855 in Germany, it is named after C. W. Tiemann (18481899). Mercury selenide (HgSe) is a chemical compound of mercury and selenium. It is a greyblack crystalline solid semimetal 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 IIVI compounds, colloidal nanocrystals of HgSe can be formed. Author: Surhone, Lambert M./ Timpledon, Miriam T./ Marseken, Susan F. Binding Type: Paperback Number of Pages: 80 Publication Date: 2010/07/24 Language: English Dimensions: 6.00 x 9.02 x 0.19 inches

Ferroselite $73.28 High Quality Content by WIKIPEDIA articles Ferroselite is an iron selenide of general formula FeSe2 precipitated under reducing conditions in anoxic environments. It is a source of selenium in the Rocky Mountains where selenium occurrence is associated with Upper Cretaceous shale deposits. Author: Miller, Frederic P./ Vandome, Agnes F./ McBrewster, John Binding Type: Paperback Number of Pages: 80 Publication Date: 2010/09/30 Language: English Dimensions: 5.98 x 9.01 x 0.19 inches

Penroseite $79.66 High Quality Content by WIKIPEDIA articles Penroseite is a rare selenide mineral with formula (Ni, Co, Cu)Se2. It has a graysteel color and black streak with a hardness of 3. It is an isometric mineral, 2/m3. Penroseite was first discovered in 1925 in a Bolivian rhyolite. It was named for Richard Penrose (18631931), an economic geologist. Penroseite is a rare mineral found in the Pacajake mines in Bolivia. It was discovered in 1925. It used to be found in fissure veins in the extrusive igneous rhyolite rock. It is considered as a member of the pyrite group from the perspective of its structure, with a cubic space group (Bayliss, 1989 Author: Surhone, Lambert M./ Timpledon, Miriam T./ Marseken, Susan F. Binding Type: Paperback Number of Pages: 104 Publication Date: 2010/07/24 Language: English Dimensions: 6.00 x 9.02 x 0.25 inches

Synthesis and Photophysics of Dendronized Nanomaterials $106.74 With luminescence quantum efficiencies ranging from 5 to 15, Cadmium selenide (CdSe) quantum dots (QDs) are stronger emitters than many organic fluorescent dyes. Inorganic coated ODs such as (CdSe)ZnS further increase quantum yield by fully coordinating free unbound surface electrons by reducing the occurrence of nonradiative transitions. The electron hole is confined to the QD core, while the electrons are delocalized throughout the core/shell structure. Surface modification of QDs with covalently attached dendrons offers a means to not only modify luminosity of the quantum dot, but to also modify its soluibility. In this dissertation, the synthesis of CdSe QDs with covalently bound thiol dendrons is presented. While covalently bonding the dendrons to the QD did not increase the quantum efficiency or emission lifetime, the dendrons did effect the morphology of the quantum dot by replacing the surface Selenium with Sulfur from the dendron attachment effectively creating an organically coated core/shell QD. Elemental analysis is presented amongst other data as evidence for the composition of the (CdSe)CdSDendron compounds. Author: Hodel, Rolande Binding Type: Paperback Number of Pages: 116 Publication Date: 2009/03/01 Language: English Dimensions: 9.00 x 6.00 x 0.28 inches

Lments Diffractifs Pour LInfrarouge Lointain $114.71 Ce mmoire porte sur la ralisation holographique de rseaux longs pas (LPG) dans les fibres optiques par laser C02. Le formalisme de couplage codirectionnel intermodal est prsent pour un couplage entre les modes symtrie circulaire et le mode fondamental. Lefficacit de diffraction des ordres 0, ]1 et 1 dun rseau carr lamellaire de ZnSe sous irradiation 10,6 um a t simule en variant le facteur de remplissage par priode, la profondeur du crneau et langle dincidence. Il apparait quun facteur de remplissage de 50 combin un crneau de 3,78 um permettent, incidence normale, dattnuer totalement lordre 0 en maximisant lnergie contenue dans les ordres +1 et 1. Ces prdictions sont vrifies exprimentalement. Lablation laser 532 nm ainsi que la gravure physique par faisceau dions ont permis de raliser les rseaux diffractifs.La gravure par faisceaux dions permet une libert dans le choix du facteur de remplissage en plus de gnrer des structures dont le pourcentage de transmission est plus lev. Une irradiation rapide et haute intensit semble tre le meilleur moyen de raliser les LPGs de manire holographique. Author: Guay, Francis Binding Type: Paperback Number of Pages: 180 Publication Date: 2010/05/26 Language: French Dimensions: 5.98 x 9.01 x 0.41 inches

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Zinc selenide (ZnSe) crystallizes in the zinc blende (ZnS) structure and has a density of 5.42 g/cm3.?

1. How many Zn2+ ions are in each unit cell?
2. How many Se2- ions are in each unit cell?
3. What is the mass of a unit cell?
4. What is the volume of a unit cell?
5. What is the edge length of a unit cell?

Look at the structure.

See how many formula units there are in that structure. Call that A

(Look up the structure. Count 1 for ions inside the unit cell; 1/2 for face; 1/4 for edge; 1/8 for corner)

(A x molar mass ZnSe) = mass (amu)

mass (amu)/(Avogadro's number) = mass (g)

Mass(g) = density (g/cm3) x volume (cm3)

volume (cm3) = (length of unit cell)^3

And all that's left is the arithmetic. good luck.