chalcogen


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Related to chalcogen: Chalcogenide, Rare earth metals

chalcogen

[′kal·kə·jən]
(inorganic chemistry)
Any of the elements that form group 16 of the periodic table; included are oxygen, sulfur, selenium, tellurium, and polonium.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

chalcogenide glass

A type of glass that uses chalcogen (pronounced "kal-kuh-gen") elements such as sulfur, selenium and tellurium. It has the unique property of being able to interact with both photons and electrons. Used in lenses, optical fibers, the recording layer in optical discs, it is also used in the bit cell of phase change memory. See GST, phase change disc, phase change memory and programmable metallization cell.
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References in periodicals archive ?
This structure contains dimers of Cr[X.sub.6] (X = S, Se, or Te) octahedra and ninefold coordination between the A site and the chalcogen atoms.
Frontera, "Halogen bonding versus chalcogen and pnicogen bonding: a combined Cambridge structural database and theoretical study," CrystEng-Comm, vol.
Categories The Categories were six intraverbals in which the antecedent stimuli was the expression, "What is the..." followed by one of the following terms: "boron [-group] ", "indium", "49", "chalcogen", "polonium", or "84".
One of the most salient properties of layered Sn[S.sub.2] is their ability to act as a host for atomic and molecular guest species, which are accommodated at the empty sites bounded by van der Waals forces between the adjacent close packed chalcogen layers [23].
Aratono, "Conductometric and spectroscopic studies of sodium dodecyl sulfate in aqueous media in the presence of organic chalcogen," Colloids and Surfaces A: Physicochemical and Engineering Aspects, vol.
(27.) Rathore, KS, Patidar, D, Janu, Y, Saxena, NS, Sharma, K, "Structural and Optical Characterization of Chemically Synthesized ZnS Nanoparticles." Chalcogen. Lett., 5 (6) 105-110 (2008)
Being similar to these compounds, [A.sub.2][B.sub.3]-type thermoelectric chalcogenides, such as [Bi.sub.2][Te.sub.3], [Bi.sub.2][Se.sub.3], and [Sb.sub.2][Te.sub.3], also carry trigonal and quasi-layered lattice features with van-der-Waals bonding between neighbouring chalcogen atomic layers.
This volume from the April 2006 symposium focuses on alloys containing chalcogen atoms that undergo very rapid phase transitions under the influence of either electrical or optical excitation.
They were synthesized in a one-pot reaction using the appropriate phosphine chloride, lithium n-propylamide and chalcogen. The new compounds were characterized by elemental analysis, NMR spectroscopy and X-ray diffraction.
The chalcogens, elements of Groups 5B and 6B of the Periodic Table that form or have a close association with metallic ore minerals yield not only chalcogen-bearing secondary minerals, amorphous compounds and soluble anion complexes when their primary host minerals break down, but also chalcogen gases.
Since there are different anions (chalcogen and halogen) in the compound, firstly the average REN for the [[SBr.sub.4]] anion group and later [[DELTA].sub.REN] for [Tl.sub.6][SBr.sub.4] compound were calculated: