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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.
Additional recommended knowledge
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 5.2x10-6.K-1. Static dielectric constant 20.8, dynamic dielectric constant 15.1. Thermal conductivity is low at 2.7W.m-1.K-1. HgTe bonds are weak leading to low hardness values. Hardness 2.7x107 kg. m-2.
n-type doping can be achieved with elements such as boron, aluminium, gallium or indium. Iodine and iron will also dope n-type. HgTe is naturally p-type due to mercury vacancies. P-type doping is also achieved by introducing zinc, copper, silver or gold.
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.
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.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Mercury(II)_telluride". A list of authors is available in Wikipedia.|