Gallium(II) telluride

Gallium(II) telluride, GaTe, is a chemical compound of gallium and tellurium. There is research interest in the structure and electronic properties of GaTe because of the possibility that it, or related compounds, may have applications in the electronics industry. Gallium telluride can be made by reacting the elements or by metal organic vapour deposition (MOCVD).[1] . GaTe produced from the elements has a monoclinic crystal structure. Each gallium atom is tetrahedrally coordinated by 3 tellurium and one gallium atom. The gallium-gallium bond length in the Ga2 unit is 2.43 Angstrom. The structure consists of layers and can be formulated as Ga24+ 2Te2−.[2] The bonding within the layers is ionic-covalent and between the layers is predominantly van der Waals. GaTe is classified as a layered semiconductor (like GaSe and InSe which have similar structures). It is a direct band gap semiconductor with an energy of 1.65eV at room temperature.[3] A hexagonal form can be produced by low pressure metal organic vapour deposition (MOCVD) from alkyl gallium telluride cubane-type clusters e.g. from (t-butylGa( μ3-Te))4. The core consists of a cube of eight atoms, four gallium, and four tellurium atoms. Each gallium has an attached t-butyl group and three adjacent tellurium atoms and each tellurium has three adjacent gallium atoms. The hexagonal form, which is closely related to the monoclinic form, containing Ga24+ units, converts to the monoclinic form when annealed at 500 °C.[1]

Gallium(II) telluride
Names
Other names
gallium telluride
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.031.524
EC Number
  • 234-690-1
Properties
GaTe
Molar mass 197.32 g/mol
Appearance black pieces
Density 5.44 g/cm3, solid
Melting point 824 °C (1,515 °F; 1,097 K)
Structure
hexagonal, hP8
P63/mmc, No. 194
Hazards
not listed
NFPA 704 (fire diamond)
Flammability code 0: Will not burn. E.g. waterHealth code 4: Very short exposure could cause death or major residual injury. E.g. VX gasReactivity code 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g. liquid nitrogenSpecial hazards (white): no code
0
4
0
Related compounds
Other anions
 gallium(II) oxide, gallium(II) sulfide, gallium monoselenide
Other cations
 zinc(II) telluride, germanium(II) telluride, indium(II) telluride
Related compounds
 gallium(III) telluride
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

References

Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 978-0-08-037941-8.

  1. Chemical Vapor Deposition of Hexagonal Gallium Selenide and Telluride Films from Cubane Precursors: Understanding the Envelope of Molecular Control E G. Gillan and A R. Barron Chem. Mater., 9 (12), 3037 -3048, 1997.
  2. Monotellurure de gallium, GaTe, Julien-Pouzol M., Jaulmes S.,Guittard M.,Alapini F., Acta Crystallographica B. Vol. 35, no. 12, pp. 2848-2851. 15 Dec. 1979 doi:10.1107/S0567740879010803
  3. Anharmonicity in GaTe layered crystals, A. Aydinli, N. M. Gasanly, A. Uka, H. Efeoglu, Cryst. Res. Technol. 37 (2002) 12 1303–1309
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