Tungsten telluride

Crystal structure
General
Surname	Tungsten telluride
other names	Tungsten ditelluride; Tungsten (IV) telluride;
Ratio formula	WTe 2
Brief description	gray solid
External identifiers / databases
EC number	235-086-0
ECHA InfoCard	100,031,884
PubChem	82913
Wikidata	Q4119676
properties
Molar mass	439.04 g mol −1
Physical state	firmly
density	9.49 g cm −3
Melting point	972 ° C (decomposition)
solubility	practically insoluble in water, ammonia, hydrochloric acid and sulfuric acid; Decomposes in nitric acid;
safety instructions
GHS hazard labeling ; no classification available
GHS hazard labeling ; no classification available
	As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Tungsten telluride is an inorganic chemical compound of tungsten from the group of tellurides and dichalcogenides.

Extraction and presentation

Tungsten telluride can be obtained by reacting tungsten with tellurium in a vacuum at 800 ° C.

{\ displaystyle \ mathrm {W + 2 \ Te \ longrightarrow WTe_ {2}}}

properties

Tungsten telluride is a gray solid that is practically insoluble in water. When heated, it begins to react with oxygen from around 650 ° C and in a vacuum it begins to decompose from around 600 ° C. It has an orthorhombic crystal structure with the space group Pmn 2 ₁ (space group no. 31) . The material has a layer structure. In 2014, the existence of a giant magnetoresistance at low temperatures and in 2015 the existence of quasiparticles of the Weyl fermion type could be detected in tungsten telluride . Template: room group / 31

use

Tungsten telluride is used in the semiconductor industry.

Individual evidence

^ ^A ^b William M. Haynes: CRC Handbook of Chemistry and Physics, 94th Edition . CRC Press, 2016, ISBN 978-1-4665-7115-0 , pp. 97 ( limited preview in Google Book search).
↑ ^a ^b ^c ^d ^e ^f Erik Lassner, Wolf-Dieter Schubert: Tungsten Properties, Chemistry, Technology of the Element, Alloys, and Chemical Compounds . Springer Science & Business Media, 2012, ISBN 978-1-4615-4907-9 , pp. 167 ( limited preview in Google Book search).
↑ This substance has either not yet been classified with regard to its hazardousness or a reliable and citable source has not yet been found.
↑ Jane E. Callanan, GA Hope, Ron D. Weir, Edgar F. Westrum: Thermodynamic properties of tungsten ditelluride (WTe2) I. The preparation and low temperature heat capacity at temperatures from 6 K to 326 K. In: The Journal of Chemical Thermodynamics. 24, 1992, p. 627, doi : 10.1016 / S0021-9614 (05) 80034-5 .
^ BE Brown: The crystal structures of WTe2 and high-temperature MoTe2. In: Acta Crystallographica. 20, 1966, p. 268, doi : 10.1107 / S0365110X66000513 .
↑ Chia-Hui Lee, Eduardo Cruz Silva, Lazaro Calderin, Minh An T. Nguyen, Matthew J. Hollander, Brian Bersch, Thomas E. Mallouk, Joshua A. Robinson: Tungsten Ditelluride: a layered semimetal. In: Scientific Reports. 5, 2015, p. 10013, doi : 10.1038 / srep10013 .
Jump up ↑ Mazhar N. Ali, Jun Xiong, Steven Flynn, Jing Tao, Quinn D. Gibson, Leslie M. Schoop, Tian Liang, Neel Haldolaarachchige, Max Hirschberger, NP Ong, RJ Cava: Large, non-saturating magnetoresistance in WTe2. In: Nature. 2014, doi : 10.1038 / nature13763 .
↑ Spectrum of Science: Type 2 Weyl Fermions: News from Particle Prediction , accessed on June 5, 2016.
^ Dale L. Perry: Handbook of Inorganic Compounds, Second Edition . CRC Press, 2016, ISBN 978-1-4398-1462-8 , pp. 442 ( limited preview in Google Book search).

[William_M._Haynes-1] A ^b William M. Haynes: CRC Handbook of Chemistry and Physics, 94th Edition . CRC Press, 2016, ISBN 978-1-4665-7115-0 , pp. 97 ( limited preview in Google Book search).

[Erik_Lassner,_Wolf-Dieter_Schubert-2] ↑ ^a ^b ^c ^d ^e ^f Erik Lassner, Wolf-Dieter Schubert: Tungsten Properties, Chemistry, Technology of the Element, Alloys, and Chemical Compounds . Springer Science & Business Media, 2012, ISBN 978-1-4615-4907-9 , pp. 167 ( limited preview in Google Book search).

[NV-3] This substance has either not yet been classified with regard to its hazardousness or a reliable and citable source has not yet been found.

[DOI10.1016/S0021-9614(05)80034-5-4] Jane E. Callanan, GA Hope, Ron D. Weir, Edgar F. Westrum: Thermodynamic properties of tungsten ditelluride (WTe2) I. The preparation and low temperature heat capacity at temperatures from 6 K to 326 K. In: The Journal of Chemical Thermodynamics. 24, 1992, p. 627, doi : 10.1016 / S0021-9614 (05) 80034-5 .

[DOI10.1107/S0365110X66000513-5] BE Brown: The crystal structures of WTe2 and high-temperature MoTe2. In: Acta Crystallographica. 20, 1966, p. 268, doi : 10.1107 / S0365110X66000513 .

[DOI10.1038/srep10013-6] Chia-Hui Lee, Eduardo Cruz Silva, Lazaro Calderin, Minh An T. Nguyen, Matthew J. Hollander, Brian Bersch, Thomas E. Mallouk, Joshua A. Robinson: Tungsten Ditelluride: a layered semimetal. In: Scientific Reports. 5, 2015, p. 10013, doi : 10.1038 / srep10013 .

[DOI10.1038/nature13763-7] Jump up ↑ Mazhar N. Ali, Jun Xiong, Steven Flynn, Jing Tao, Quinn D. Gibson, Leslie M. Schoop, Tian Liang, Neel Haldolaarachchige, Max Hirschberger, NP Ong, RJ Cava: Large, non-saturating magnetoresistance in WTe2. In: Nature. 2014, doi : 10.1038 / nature13763 .

[spektrum.de-8] Spectrum of Science: Type 2 Weyl Fermions: News from Particle Prediction , accessed on June 5, 2016.

[Dale_L._Perry-9] Dale L. Perry: Handbook of Inorganic Compounds, Second Edition . CRC Press, 2016, ISBN 978-1-4398-1462-8 , pp. 442 ( limited preview in Google Book search).