A chalcogenide is a chemical compound consisting of at least one chalcogen ion and at least one more electropositive element. Although all group 16 element s of the periodic table are defined as chalcogens, the term is more commonly reserved for sulfide s, selenide s, and Telluride chemistry telluride s, rather than oxide s. photoconductivity Photoconductive chalcogenide glass es are used in xerography and television . Citation needed date December 2007 An optical processing chip using a chalcogenide as a photodetector has been developed by The University of Sydney with potential to speed up links between optical fibre networks and computers. ref http www.smh.com.au articles 2008 07 09 1215282927991.html Chip may speed up internet 100 times Deborah Smith for Sydney Morning Herald July 10, 2008 ref Examples Cadmium telluride Indium sulfide Zinc telluride Sodium selenide See also Phase change memory Chalcogen negative resistance External links http scienceblog.com 45604 phase change memory based monetasystem points to the future of computer storage Phase change memory based moneta system points to the future of computer storage ScienceBlog Jun 03, 2011 http www.spacemart.com reports Tiny Chip Demonstrates Big Memory in Cosmos 999.html Tiny Chip Demonstrates Big Memory in Cosmos Michael P. Kleiman for Air Force Research Laboratory, Space Vehicles Directorate SpaceDaily Jul 27, 2006 http www.opticsinfobase.org abstract.cfm?URI oe 17 4 2182 Breakthrough switching speed with an all optical chalcogenide glass chip 640 Gbit s demultiplexing Michael Galili, Jing Xu, Hans C. Mulvad, Leif K. Oxenl we, Anders T. Clausen, Palle Jeppesen, Barry Luther Davis, Steve Madden, Andrei Rode, Duk Yong Choi, Mark Pelusi, Feng Luan, and Benjamin J. Eggleton Optics Express, Vol. 17, Issue 4, pp. 2182 2187 February 2, 2009 Maksym V. Kovalenko, Marcus Scheele, and Dmitri V. Talapin. Colloidal Nanocrystals with Molecular Metal Chalcogenide Surface Ligands . Science 324 12June2009 1417 1420 ... more details
Unreferenced stub auto yes date December 2009 Image Hawleyite 3D balls.png thumb right Cadmium sulfide In chemistry , metal chalcogenides are chemical compound compounds consisting of a metal and an element which is a member of the chalcogen column of the periodic table . While oxygen is a member of the chalcogens, so all metal oxide s are technically metal chalcogenides, the term is commonly used only to refer to compounds of a metal with sulfur , selenium or tellurium , and polonium . Important metal chalcogenides include the semiconductor cadmium sulfide , which is used in the production of photoresistor s, and cadmium selenide , which is used to produce quantum dots . DEFAULTSORT Metal Chalcogenide Category Inorganic compounds Inorganic compound stub hi ... more details
A chalcogenide glass hard ch as in chemistry is a glass containing one or more chalcogen ide Chemical element elements . These are Group 16 in the periodic table e.g. sulfur , selenium or tellurium . Such glasses are covalently bonded materials and may be classified as network solid s. In effect, the entire glass matrix acts like an infinitely bonded molecule. The classical chalcogenide glasses are strong glass formers mainly sulphur based ones such as systems As S, Ge S possess glasses within large concentration regions. Glass forming abilities decrease with increasing molar weight of constituent elements i.e. S Se Te. Semiconducting properties of chalcogenide glasses were revealed in 1955 by B.T. Kolomiets and N.A. Gorunova from Ioffe Institute , USSR ref name Kolomiets B.T. Kolomiets, Physica Status Solidi, vol. 7, p. 359, p. 713, 1964. ref . This discovery initiated the numerous researches and applications of this new class of semiconducting materials. Modern chalcogenide compounds like GeSbTe , widely used in rewritable optical disks and Phase change memory PRAM devices, are fragile glass formers, therefore they are able to crystallize in about 100 ns. Applications File CD RW bottom.jpg thumb right A CD RW CD . Amorphous chalcogenide materials form the basis of re writable CD and DVD solid state memory technology. ref name Greer05 The modern technological applications of chalcogenide glasses are widespread. Examples include infrared detectors, mouldable infrared optics such as lens optics lenses , and infrared optical fiber s, with the main advantage being that these materials ... of chalcogenide glasses high refractive index, low phonon energy, high nonlinearity also make them ... element rare earth ions. Some chalcogenide materials experience thermally driven amorphous crystalline ... in chalcogenide semiconductors emerged in the 1960s, when the amorphous chalcogenide Te sub 48 ... can also be useful for data storage in a solid chalcogenide electrolyte. At the nanoscale, this electrolyte ... more details
Orphan date January 2011 Unreferenced auto yes date December 2009 Metallate is the name given to any complex anion containing a metal ligated to several atom s or small groups. The spelling metalate is almost as common. Wiktionary Typically, the metal will be one of the transition element s and the ligand will be oxygen or another chalcogenide or a cyanide group though others are known . The chalcogenide metallates are known as oxometallate s, thiometallate s, selenometallate s and tellurometallate s the cyanide metallates are known as cyanometallate s. Oxometallates include permanganate , chromate and vanadate . Thiometallates include tetrathiomolybdate and similar ions. Cyanometallates include ferricyanide and ferrocyanide . Metallate is also used as a verb by bioinorganic chemistry to describe the act of adding metal atoms or ions to a site synthetic ligand or protein. Category Anions Inorganic compound stub ... more details
C RAM may refer to Chalcogenide RAM, an alternative name for phase change memory Computational RAM , random access memory with integrated processing elements Counter Rocket, Artillery, and Mortar , a weapon system disambig Short pages monitor This long comment was added to the page to prevent it being listed on Special Shortpages. It and the accompanying monitoring template were generated via Template Longcomment. Please do not remove the monitor template without removing the comment as well. ... more details
orphan date January 2010 A chalcogel or properly metal chalcogenide aerogel is an aerogel made from chalcogen s the column of elements on the periodic table beginning with oxygen such as sulfur and selenium, with cadmium, tellurium, platinum, and other elements. ref cite web title Heavy Metal Filter Made Largely from Air url http www.sciam.com article.cfm?chanId sa003&articleId 044B7489 E7F2 99DF 3433709C76B127DF date 2007 07 26 author Biello, David publisher Scientific American ref Research is ongoing, and metals less expensive than platinum have also been used in its creation. Chalcogels preferentially absorb heavy metals, ref S. Bag et al. http www.sciencemag.org cgi content full 317 5837 490 Porous Semiconducting Gels and Aerogels from Chalcogenide Clusters . Science 2007 07 27 Vol. 317. no. 5837, pp. 490 493, DOI 10.1126 science.1142535 ref showing promise in absorbing pollutants mercury, lead, and cadmium from water. ref Carmichael, Mary. http www.newsweek.com id 32528 First Prize for Weird A bizarre substance, like frozen smoke, may clean up rivers, run cell phones and power spaceships. Newsweek International, 2007 08 13. Retrieved on 2007 08 05. ref In addition, scientists have made one that is claimed to be twice as effective at desulfurization as any current methods. This is a very impressive feat, particularly because until the discovery of chalcogels properties, scientists were beginning to consider desulfurization an optimized process. ref cite web title New Sponge like Material Can Remove Mercury From Water, Separate Hydrogen From Other Gases And Pull Sulfur Out Of Crude Oil url http www.sciencedaily.com releases 2009 05 090517143341.htm date 2009 05 17 publisher ScienceDaily ref Semiconducting metal chalcogenide aerogels, first demonstrated by Professor Stephanie Brock at Wayne State University , show great promise for use in chemical sensors, solar cells ... background about the synthesis and applications of metal chalcogenide aerogels on Aerogel.org ... more details
wiktionary cram Cram may refer to Cram surname , a surname, and list of notable persons having the surname Cram game show Cram game show , a TV game show that aired on the Game Show Network Cram Middle earth , a fictional type of bread in J. R. R. Tolkien s Middle earth legendarium Cramming education , a slang term for last minute study Cram school , a specialized school that trains students to pass entrance exams Cram game , an impartial mathematical game similar to domineering CRAM may refer to NCR CRAM , Card Random Access Memory, a computer memory technology developed by NCR CRAM, Centro Ricerca Artistica Mezzocorona, Centre for Art Research in Mezzocorona Kronmetz, Italy Chalcogenide RAM , Chalcogenide random access memory, a phase change computer memory technology Challenge response authentication , Challenge Response Authentication Mechanism, a computer security procedure Counter RAM , Counter Rockets, Artillery and Mortars, a weapons system CRAM protein , Cysteine rich Acidic Trans membrane protein MS CRAM , also known as Microsoft Video 1, a codec CRAM diet , the Cereal, Rice, And Milk diet, an alternative to the BRAT diet See also CRAMM , CCTA Risk Analysis and Method Management C RAM disambiguation Cram software , software disambig de Cram fr CRAM ... more details
wiktionary pram PRAM Pram may refer to Pram, Austria Pram band , a musical group Pram ship , a type of shallow draught, flat bottomed ship large watercraft A type of Dinghy Types dinghy small watercraft with a flat bow A type of wheeled baby transport A character in the video game Makai Kingdom Chronicles of the Sacred Tome PRAM may stand for Parallel Random Access Machine , an abstract computer for designing parallel algorithms Phase change RAM , a chalcogenide glass type of non volatile random access memory Parameter RAM, a designated segment of non volatile random access memory used in Macintosh systems disambig de Pram fr PRAM it PRAM ... more details
and the Japanese NASDA , to study the electrical and optical properties of SiAsTe amorphous or chalcogenide ... chalcogenide glasses fabricated under microgravity environment br Wahid Shams Kolahi, Shoichi ... 9. Pressure Effects on Electrical and Optical Properties of Si As Te Chalcogenide Glasses Fabricated ... Chalcogenide Glasses Prepared in the Gravity Environment of the Earth and in a Microgravity Environment ... of Applied Physics Jpn. J. Appl. Phys. 35 1996 6162 X Ray Photoelectron Spectroscopy of Si As Te Chalcogenide ... more details
AgInSbTe , or Silver Indium Antimony Tellurium , is a phase change material from the group of chalcogenide glass es, used in rewritable optical disc s such as CD RW rewritable CDs and phase change memory applications. It is a quaternary compound of silver , indium , antimony , and tellurium . During writing, the material is first erased, initialized into its crystalline state, with long, lower intensity laser irradiation. The material heats up to its crystallization temperature, but not up to its melting point, and crystallizes in a metastable face centered cubic structure. Then the information is written on the crystalline phase, by heating spots of it with short 10 ns , high intensity laser pulses the material locally melts and is quickly cooled, remaining in the amorphous phase. As the amorphous phase has lower reflectivity than the crystalline phase, the bitstream can be recorded as dark amorphous spots on the crystalline background. At low linear velocities, clusters of crystalline material can exist in the amorphous spots. http jjap.ipap.jp link?JJAP 44 3042 Another similar material is GeSbTe , offering a lower linear density, but with higher overwrite cycles by 1 2 orders of magnitude. It is used in pit and groove recording formats, often in DVD RW rewritable DVDs . Glass science Category Optical materials Category Alloys Category Non oxide glasses Category Compact Disc Category Chalcogenides alloy stub glass material stub ... more details
chembox verifiedrevid 385577050 ImageFile TaTe2structure.png IUPACName tantalum IV telluride OtherNames tantalum ditelluride br tantalum telluride Section1 Chembox Identifiers CASNo 12067 66 2 PubChem SMILES Section2 Chembox Properties Formula TaTe sub 2 sub MolarMass 436.15 g mol Appearance Density 9.4 g cm sup 3 sup MeltingPt BoilingPt Solubility Section3 Chembox Structure CrystalStruct Monoclinic , Pearson symbol mS18 SpaceGroup C2 m, No. 12 Tantalum telluride Tantalum Ta Tellurium Te sub 2 sub is a chemical compound of tantalum and tellurium . It is unusual in that it forms dodecagonal chalcogenide quasicrystal s, a formation that cannot occur in a normal crystal because it does not result in a Periodic table crystal structure periodic crystal lattice . External links http www.webelements.com compounds tantalum tantalum ditelluride.html Chemical properties on WebElements http www.microscopy.ethz.ch tate.htm Tantalum Telluride Quasicrystals at ETH Microscopy Tantalum compounds Category Tellurides Category Tantalum compounds Inorganic compound stub ar ... more details
that it is easier to deposit high quality precursor layers and convert them to the chalcogenide than to directly deposit chalcogenide thin films. It is also possible to grow films with graded ... more details
Memory types Phase change memory also known as PCME , PRAM , PCRAM , Ovonic Unified Memory , Chalcogenide RAM and C RAM is a type of NVRAM non volatile computer memory based on the memristor first developed by Hewlett Packard in 2008 ref name memristor2011 Citation date 10 October 2011 title HP and Hynix ... months ref . PRAMs exploit the unique behavior of chalcogenide glass . Heat produced by the passage ... Devices first explored the properties of chalcogenide glasses as a potential memory technology ... 20670, January 1969 ref ref Chalcogenide Glass Bistable Resistivity Memory C.H. Sie, A.V. Pohm, P ... described and demonstrated the feasibility of a phase change memory device by integrating chalcogenide ... mechanism in chalcogenide glass involves electric field induced crystalline filament growth. ref ... 2010 02 04 ref The crystalline and amorphous states of chalcogenide glass have dramatically different ... numeral system binary 0, while the crystalline, low resistance state represents a 1. Chalcogenide ..., the material s optical properties are manipulated, rather than its electrical resistivity, as chalcogenide ... use of a chalcogenide alloy of germanium , antimony and tellurium GeSbTe called GST. The stoichiometry ... chalcogenide crystallinity is lost. Once cooled, it is frozen into an amorphous glass like state and its electrical resistance is high. By heating the chalcogenide to a temperature above its crystallization .... Cooler portions of the chalcogenide take longer to crystallize, and overheated portions may be remelted ..., resulting in higher power consumption. The chalcogenide resistance being a necessarily larger resistance ... are not solid state. Instead, a very small platter coated in chalcogenide is dragged beneath many thousands or even millions of electrical probes that can read and write the chalcogenide. Hewlett Packard ... and Gorunova revealed semiconducting properties of chalcogenide glass es. ref http onlinelibrary.wiley.com ... Charles H. Sie published a dissertation at Iowa State University on chalcogenide phase change memory ... more details
Refimprove date December 2009 Ionbox Name Telluride Section1 Chembox Identifiers ChemSpiderID 19241429 ChemSpiderID Ref chemspidercite correct chemspider SMILES Te StdInChI 1S Te q 2 StdInChI Ref stdinchicite correct chemspider StdInChIKey XSOKHXFFCGXDJZ UHFFFAOYSA N StdInChIKey Ref stdinchicite correct chemspider Section2 Chembox Properties Formula Chem Te 2 MolarMass 127.6 g mol sup 1 sup ExactMass 129.906222753 g mol sup 1 sup Section3 Chembox Related OtherAnions Sulfide The telluride ion is tellurium Te sup 2 sup . It is the final stable member of the series of dianions oxide O sup 2&minus sup , sulfide S sup 2&minus sup , and selenide Se sup 2&minus sup see chalcogenide . Tellurides also describe a class of compounds formally derived from Te sup 2 sup i.e., their electronic structure is reasonably well approximated by considering the tellurium atom as having an octet configuration. Using this approach, Ag sub 2 sub Te is derived from Ag sup sup . Examples hydrogen telluride , H sub 2 sub Te sodium telluride , Na sub 2 sub Te See Category Tellurides category for a list. Discussion In aqueous solution , Te sup 2 sup exists only at high pH. In neutral conditions, hydrogen telluride ion, HTe sup sup , is prevalent. In acid conditions, hydrogen telluride , H sub 2 sub Te, forms. Products of three reaction products with tellurium have economic importance cadmium, bismuth, and lead. Cadmium telluride has photovoltaic activity, while bismuth and lead tellurides are exceptional thermoelectric materials. ref http thebigblogtheory.wordpress.com 2011 02 03 s04e14 the thesbian catalyst The Thespian Catalyst , David Saltzberg ref Notes Reflist DEFAULTSORT Telluride Chemistry Category Anions Category Tellurides Inorganic compound stub de Telluride fr Tellurure nl Telluride scheikunde ja ... more details
Refimprove date May 2009 chembox verifiedrevid 431676226 Name Arsenic triselenide ImageFile As2Se3structure.jpg OtherNames Arsenic III selenide Reference ref name hand Citation last Lide first David R. author link year 1998 title Handbook of Chemistry and Physics edition 87 publication place Boca Raton, FL publisher CRC Press isbn 0 8493 0594 2 pages 4 43 ref Section1 Chembox Identifiers ChemSpiderID Ref chemspidercite correct chemspider ChemSpiderID 14089 InChI 1 As2Se3 c3 1 5 2 4 SMILES Se As Se As Se InChIKey WBFMCDAQUDITAS UHFFFAOYAQ StdInChI Ref stdinchicite correct chemspider StdInChI 1S As2Se3 c3 1 5 2 4 StdInChIKey Ref stdinchicite correct chemspider StdInChIKey WBFMCDAQUDITAS UHFFFAOYSA N CASNo Ref cascite correct CAS CASNo 1303 36 2 PubChem 14772 RTECS CG2285000 Section2 Chembox Properties Formula As sub 2 sub Se sub 3 sub MolarMass 386.72 g mol Appearance brown black powder Odor odorless Density 4.75 g cm sup 3 sup Solubility insoluble MeltingPt 360 C BoilingPt Section3 Chembox Structure CrystalStruct Monoclinic , Pearson symbol mP20 , SpaceGroup P2 sub 1 sub c, No. 14 mP20 P21 c 14 Section7 Chembox Hazards EUClass not listed NFPA H 4 NFPA R 0 NFPA F 0 Section8 Chembox Related OtherAnions diarsenic trioxide , diarsenic trisulfide , arsenic tribromide , arsenic III telluride OtherCations antimony III selenide OtherCpds arsenic V selenide Arsenic triselenide Arsenic As sub 2 sub Selenium Se sub 3 sub is an inorganic chemical compound , a selenide of arsenic . Amorphous arsenic triselenide is used as a chalcogenide glass for infrared optics , as it transmits light with wavelength s between 870 nm and 17.2 m. Arsenic triselenide is covalently bonded. Even so, the arsenic has a formal oxidation state of 3. Safety Arsenic triselenide should be kept away from strong bases in contact with aluminium or zinc and strong acids. References Reflist Arsenic compounds Category Chalcoarsenics Category Selenides Category Optical materials Category Non oxide glasses Glass ... more details
chembox verifiedrevid 408046099 ImageFile GeTeRhobohedral.jpg ImageSize IUPACName OtherNames Section1 Chembox Identifiers ChemSpiderID Ref chemspidercite correct chemspider ChemSpiderID 74888 InChI 1 GeTe2 c2 1 3 SMILES Te Ge Te InChIKey GPMBECJIPQBCKI UHFFFAOYAU StdInChI Ref stdinchicite correct chemspider StdInChI 1S GeTe2 c2 1 3 StdInChIKey Ref stdinchicite correct chemspider StdInChIKey GPMBECJIPQBCKI UHFFFAOYSA N CASNo 12025 39 7 CASNo Ref cascite correct CAS PubChem 16213264 Section2 Chembox Properties Formula GeTe MolarMass 200.21 g mol Appearance solid Density 6.14 g cm sup 3 sup MeltingPtC 725 BoilingPtC Solubility RefractIndex 5 BandGap 0.6 eV ref cite journal journal Phys. Rev. author R. Tsu et al. volume 172 page 779 788 year 1968 title Optical and Electrical Properties and Band Structure of GeTe and SnTe doi 10.1103 PhysRev.172.779 issue 3 ref Section3 Chembox Structure CrystalStruct Rhombohedral , Pearson symbol hR6 SpaceGroup R3m, No. 160 Section7 Chembox Hazards EUIndex Not listed MainHazards FlashPt Autoignition Section8 Chembox Related OtherAnions Germanium monoxide br Germanium monosulfide br Germanium monoselenide Germanium telluride GeTe is a chemical compound of germanium and tellurium and is a component of chalcogenide glass es. It shows semimetal lic conduction and ferroelectric behaviour. ref cite journal journal Phase Transitions volume 60 page 67 year 1997 title Influence of Se, Pb and Mn impurities on the ferroelectric phase transition in GeTe studied by EXAFS author A. I. Lebedev, I. A. Sluchinskaya, V. N. Demin and I. H. Munro url http semiconductors.phys.msu.su publ phtr.html ref Germanium telluride exists in three major crystalline forms, room temperature rhombohedral and orthorhombic structures and high temperature Sodium chloride cubic , rocksalt type phase phase being most common. ref cite book url http books.google.com ?id umUyWSUgRYgC&pg PA12 page 12 title Growth of Crystals author E. I. Givargizov, A.M. Mel nikova publis ... more details
Chembox verifiedrevid 443953227 ImageFile Sodium selenide unit cell 1992 CM 3D balls.png ImageSize ImageAlt IUPACName sodium selenide PIN OtherNames Section1 Chembox Identifiers CASNo Ref cascite correct ?? CASNo 1313 85 5 PubChem SMILES Section2 Chembox Properties Na 2 Se 1 Appearance amorphous solid Density 2.62 g cm sup 3 sup ref name CRC cite book isbn 9781420090840 title CRC Handbook of Chemistry and Physics edition 90th editor David R. Lide ref MeltingPt 875 C BoilingPt Solubility reacts with water Section3 Chembox Hazards MainHazards FlashPt Autoignition Section8 Chembox Related OtherAnions Sodium sulfide br Sodium telluride br Sodium oxide OtherCations Hydrogen selenide br Antimony selenide br Aluminum selenide OtherCpds Sodium selenite br Sodium selenate Sodium selenide is a inorganic compound of sodium and selenium with the chemical formula Na sub 2 sub Se. This colourless solid is prepared by the reaction of selenium with a solution of sodium in ammonia ref Handbook of Preparative Inorganic Chemistry, 2nd Ed. Edited by G. Brauer, Academic Press, 1963, NY. Vol. 1. p. 421. ref . Like other alkali metal chalcogenide s, this material is highly sensitive to water, easily undergoing hydrolysis to give mixtures of the biselenide and hydroxide. This hydrolysis occurs because of the extreme basicity of the Se sup 2 sup ion. Na sub 2 sub Se H sub 2 sub O NaHSe NaOH Similarly, sodium selenide is readily oxidized to polyselenides, a conversion signaled by off white samples. Sodium selenide reacts with acid s to produce toxic hydrogen selenide gas. Na sub 2 sub Se 2 HCl H sub 2 sub Se 2 NaCl The compound reacts with electrophiles to produce the selenium compounds. With alkyl halides, one obtains a variety of organoselenium compound s Na sub 2 sub Se 2 RBr R sub 2 sub Se 2 NaBr Organotin and organosilicon halides react similarly to give the expected derivatives Na sub 2 sub Se 2 Me sub 3 sub ECl Me sub 3 sub E sub 2 sub Se 2 NaCl E Si, Ge, Sn Safety Sodi ... more details
?patentnumber 4233375 4,233,375 High energy density plural chalcogenide cathode containing cell http ...?patentnumber 4143213 4,143,213 Cells having cathodes containing chalcogenide compounds of the formula ... chalcogenides http patft1.uspto.gov netacgi nph Parser?patentnumber 4009052 4,009,052 Chalcogenide ... more details
Self propagating high temperature synthesis SHS is a method for producing inorganic compound s by exothermic reactions, usually involving salts. A variant of this method is known as solid state metathesis SSM . Since the process occurs at high temperatures, the method is possible to ideally suited for the production of refractory materials such unusual properties, for example powders, metallic alloys, ceramics with high purity, corrosion resistance at high temperature or super hardnessity. The modern SHS process was reported and patented in 1971, ref name Merzhanov Self propagated high temperature synthesis of refractory inorganic compounds , A.G. Merzhanov, I.P. Borovinskaya. Doklady Akademii Nauk SSSR, Vol. 204, N 2, pp. 366 369, May, 1972 ref ref USSR Patent No. 255221, Byull. Izobr. No. 10 ref although some SHS like processes were known previously. Methodology In its usual format, SHS is conducted starting from finely powdered reactants that are intimately mixed. In some cases, the reagents are finely powdered whereas in other cases, they are sinter ed to minimize their surface area and prevent uninitiated exothermic reactions, which can be dangerous. ref name Kaner The synthesis is initiated by point heating of a small part usually the top of the sample. Once started, a wave of exothermic reaction sweeps through the remaining material. SHS has also been conducted thin films, liquids, gases, powder liquid systems, gas suspensions, layered systems, gas gas systems, and others. Reactions have been conducted in a vacuum and under both inert or reactive gases. The temperature of the reaction can be moderated by the addition of inert salt that absorbs heat in the process of melting or evaporation, such as sodium chloride . Examples The reaction of alkali metal chalcogenide s S, Se, Te and pnictide s N, P, As with other metal halides produce the correspond metal chalcogenides and pnictides. ref Richard G. Blair, Richard B. Kaner Solid State Metathesis Materials Synthe ... more details
16 ref , chalcogenide fibers ref cite journal last1 Fu first1 L.B. last2 Rochette first2 M. last3 ... of self phase modulation based optical regeneration in single mode As2Se3 chalcogenide glass fiber ... to advantageously replace the nonlinear fiber by a highly nonlinear chalcogenide waveguide, therefore ... B. year 2005 title Integrated all optical pulse regenerator in chalcogenide waveguides journal Optics ... more details
Infobox mineral name Dimorphite category Sulfide mineral boxwidth boxbgcolor image imagesize caption formula As sub 4 sub S sub 3 sub symmetry Orthorhombic 2 m 2 m 2 m dipyramidal unit cell a 11.24 , b 9.90 , c 6.56 Z 4 molweight 395.88 g mol strunz 02.FA.10 color orange yellow habit Groups of pyramidal crystals system orthorhombic twinning cleavage none fracture brittle tenacity mohs 1.5 luster adamantine polish refractive opticalprop Biaxial birefringence dispersion strong pleochroism fluorescence none absorption streak yellow gravity 3.59 density melt fusibility diagnostic solubility diaphaneity transparent other burns without residue references ref name Mindat http www.mindat.org min 1292.html Dimorphite mineral information and data Mindat.org ref ref name Handbook http www.handbookofmineralogy.org pdfs dimorphite.pdf Handbook of Mineralogy ref ref http webmineral.com data Dimorphite.shtml Webmineral data ref Dimorphite chemical name tetraarsenic trisulfide is a very rare orange yellow chalcogenide mineral. In nature, dimorphite forms primarily by deposit in volcanic fumaroles at temperatures of 70 80 C 158 F 176 F . Dimorphite was first discovered in a such a fumarole near Naples, Italy in 1849 by the mineralologist Arcangelo Scacchi 1810 1893 . Since its discovery, dimorphite has been found in the Alacr n silver mine near Copiap , Chile . ref name Handbook It has also been reported from Cerro de Pasco , Peru , and the Lavrion District Mines in Attica , Greece . ref name Mindat Properties and applications Dimorphite has two crystal forms, and . This property gives rise to its name, which comes from the Greek for two and form. Dimorphite transitions between its and forms at around 130 C 266 F . ref name Inorganic Dimorphite can be synthesized by melting arsenic and sulfur together in the proper molar ratios in vacuum. ref name Inorganic Wiberg, Egon, Nils Wiberg, and Arnold Frederick Holleman. Inorganic Chemistry. San Diego Academic Press, 2001. ref ... more details
Chembox verifiedrevid 408043625 ImageFile ImageSize ImageAlt IUPACName OtherNames antimony telluride, antimony III telluride, antimony telluride, diantimony tritelluride Section1 Chembox Identifiers ChemSpiderID Ref chemspidercite correct chemspider ChemSpiderID 21241420 InChIKey RSPNQEPAQCYWKS UHFFFAOYAT StdInChI Ref stdinchicite correct chemspider StdInChI 1S 2Sb.3Te q2 3 3 2 StdInChIKey Ref stdinchicite correct chemspider StdInChIKey RSPNQEPAQCYWKS UHFFFAOYSA N CASNo Ref cascite correct CAS CASNo 1327 50 0 PubChem 6369653 InChI 1 2Sb.3Te q2 3 3 2 ChemSpider 21241420 SMILES SbH3 3 . SbH3 3 . TeH2 2 . TeH2 2 . TeH2 2 Section2 Chembox Properties Sb 2 Te 3 Appearance grey solid Density 6.50 g cm sup 3 sup ref name G&E Greenwood&Earnshaw2nd pages 581 582 ref MeltingPt 580 C ref name G&E BoilingPt Solubility Section3 Chembox Hazards MainHazards FlashPt Autoignition Section8 Chembox Related OtherAnions Antimony trioxide Sb sub 2 sub O sub 3 sub br Antimony trisulfide Sb sub 2 sub S sub 3 sub br Antimony selenide Sb sub 2 sub Se sub 3 sub OtherCations Arsenic telluride As sub 2 sub Te sub 3 sub br Bismuth telluride Bi sub 2 sub Te sub 3 sub OtherCpds Antimony telluride is an inorganic compound with the chemical formula Sb sub 2 sub Te sub 3 sub . It is a grey, crystalline solid , although its melting point , density and colour may depend on the Polymorphism materials science crystalline form it adopts. Synthesis Antimony telluride can be formed by the reaction of antimony with tellurium at 500 900 C. ref name G&E 2Sb l 3Te l Sb sub 2 sub Te sub 3 sub l Applications Like other binary compound binary chalcogenide s of antimony and bismuth , Sb sub 2 sub Te sub 3 sub has been investigated for its semiconductor properties. It can be transformed into both N type semiconductor n type and P type semiconductor p type semiconductors by Doping semiconductor doping with an appropriate dopant . ref name G&E Sb sub 2 sub Te sub 3 sub forms the Binary compound pseu ... more details
Metal Chalcogenide Halide Solids and Their Molecular Cluster Analogues , Angewandte Chemie ... 6 Metal Chalcogenide Cluster Complexes and Their Relationships to Solid State Cluster Compounds ... more details
GeSbTe , Germanium Antimony Tellurium or GST is a phase change material from the group of chalcogenide glass es, used in rewritable optical disc s and phase change memory applications. Its recrystallization time is 20 nanoseconds, allowing bitrate s of up to 35 megabit Mbit s to be written, and direct overwrite capability up to 10 sup 6 sup cycles. It is suitable for land groove recording formats. It is often used in DVD RW rewritable DVDs . New phase change memories are possible using doping semiconductors n doped GeSbTe semiconductor . The melting point of the alloy is about 600 C 900 K and the crystallization temperature is between 100 150 C. During writing, the material is erased, initialized into its crystalline state, with low intensity laser irradiation. The material heats up to its crystallization temperature, but not its melting point, and crystallizes. The information is written at the crystalline phase, by heating spots of it with short 10 ns , high intensity laser pulses the material melts locally and is quickly cooled, remaining in the amorphous phase. As the amorphous phase has lower reflectivity than the crystalline phase, data can be recorded as dark spots on the crystalline background. Recently, novel liquid organogermanium precursors, such as isobutylgermane ref cite journal author Deo V. Shenai, Ronald L. DiCarlo, Michael B. Power, Artashes Amamchyan, Randall J. Goyette, Egbert Woelk url http www.sciencedirect.com science? ob ArticleURL& udi B6TJ6 4MS9K7M 1& user 10& coverDate 01 2F31 2F2007& alid 571098462& rdoc 1& fmt summary& orig search& cdi 5302& sort d& docanchor &view c& ct 12& acct C000050221& version 1& urlVersion 0& userid 10&md5 393a7a045ea6a5beee881039c2cf98e5 title Safer alternative liquid germanium precursors for MOVPE journal Journal of Crystal .... Gawelda, J. Siegel, title Hot Wire Chemical Vapor Deposition of Chalcogenide Materials for Phase Change ... wiki DIPTe DIPTe respectively, to grow GeSbTe and other chalcogenide films of very high purity by metalorganic ... more details
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