Mercury telluride
{{Short description|Topologically insulating chemical compound
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{{Use Oxford spelling|date=January 2019}}{{chembox
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| Name = Mercury telluride
| ImageFile = Mercury-telluride-unit-cell-3D-balls.png
| IUPACName =
| SystematicName = Mercury telluride
| OtherNames = Mercuric telluride, mercury(II) telluride
|Section1={{Chembox Identifiers
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| CASNo = 12068-90-5
| ChemSpiderID = 74814
| EINECS = 235-108-9
| PubChem = 82914
| SMILES = [Te]=[Hg]
| StdInChI = 1S/Hg.Te
| StdInChIKey = VCEXCCILEWFFBG-UHFFFAOYSA-N
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|Section2={{Chembox Properties
| Formula = HgTe
| MolarMass = 328.19 g/mol
| Appearance = near black cubic crystals
| Density = 8.1 g/cm3
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| MeltingPt_notes = 670°C
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|Section3={{Chembox Structure
| CrystalStruct = Sphalerite, cF8
| SpaceGroup = F{{overline|4}}3m, No. 216
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Mercury telluride (HgTe) is a binary chemical compound of mercury and tellurium. It is a semi-metal related to the II-VI group of semiconductor materials. Alternative names are mercuric telluride and mercury(II) telluride.
HgTe occurs in nature as the mineral form coloradoite.
Physical properties
All properties are at standard temperature and pressure unless stated otherwise. The lattice parameter is about 0.646 nm in the cubic crystalline form. The bulk modulus is about 42.1 GPa. The thermal expansion coefficient is about 5.2×10−6/K. The static and dynamic dielectric constants are 20.8 and 15.1, respectively. The thermal conductivity is low at 2.7 W·m2/(m·K). HgTe bonds are weak leading to low hardness values. The hardness is 2.7×107 kg/m2.
=Doping=
=Topological insulation=
{{Main|Topological insulator}}
File:HgTe@SWCNT.png, combined with an image simulation (left).{{cite journal|doi=10.1021/nn5023632 |pmid=25163005 |title=Raman Spectroscopy of Optical Transitions and Vibrational Energies of ~1 nm HgTe Extreme Nanowires within Single Walled Carbon Nanotubes |journal=ACS Nano |volume=8|issue=9 |pages=9044–52 |year=2014 |last1=Spencer |first1=Joseph |last2=Nesbitt |first2=John |last3=Trewhitt |first3=Harrison |last4=Kashtiban |first4=Reza |last5=Bell |first5=Gavin |last6=Ivanov |first6=Victor |last7=Faulques |first7=Eric |last8=Smith |first8=David|url=https://eprints.soton.ac.uk/401309/1/HgTe%2540SWNT_ACSNano_Final.pdf }}]]
Mercury telluride was the first topological insulator discovered, in 2007. Topological insulators cannot support an electric current in the bulk, but electronic states confined to the surface can serve as charge carriers.
Chemistry
HgTe bonds are weak. Their enthalpy of formation, around −32kJ/mol, is less than a third of the value for the related compound cadmium telluride. HgTe is easily etched by acids, such as hydrobromic acid.
Growth
Bulk growth is from a mercury and tellurium melt in the presence of a high mercury vapour pressure. HgTe can also be grown epitaxially, for example, by sputtering or by metalorganic vapour phase epitaxy.
Nanoparticles of mercury telluride can be obtained via cation exchange from cadmium telluride nanoplatelets.{{Cite journal |last1=Izquierdo |first1=Eva |last2=Robin |first2=Adrien |last3=Keuleyan |first3=Sean |last4=Lequeux |first4=Nicolas |last5=Lhuillier |first5=Emmanuel |last6=Ithurria |first6=Sandrine |date=2016-08-12 |title=Strongly Confined HgTe 2D Nanoplatelets as Narrow Near-Infrared Emitters |url=https://pubs.acs.org/doi/full/10.1021/jacs.6b04429 |journal=Journal of the American Chemical Society |volume=138 |issue=33 |pages=10496–10501 |doi=10.1021/jacs.6b04429 |pmid=27487074 |bibcode=2016JAChS.13810496I |issn=0002-7863}}
See also
References
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External links
- [http://www.fiz-chemie.de/infotherm/html/molpages/03%5C06%5C/mol30632.html Thermophysical properties database]{{dead link|date=January 2018 |bot=InternetArchiveBot |fix-attempted=yes }} at Germany's Chemistry Information Centre, Berlin
{{Mercury compounds}}
{{Tellurides}}
Category:Mercury(II) compounds