Germanium telluride

Germanium telluride
Identifiers
CAS number 12025-39-7 Y
PubChem 16213264
ChemSpider 74888 Y
Jmol-3D images Image 1
Properties
Molecular formula GeTe
Molar mass 200.21 g/mol
Appearance solid
Density 6.14 g/cm3
Melting point

725 °C, 998 K, 1337 °F
Band gap 0.6 eV [1]
Refractive index (nD) 5
Structure
Crystal structure Rhombohedral, hR6
Space group R3m, No. 160
Hazards
EU Index Not listed
Related compounds
Other anions Germanium monoxide
Germanium monosulfide
Germanium monoselenide
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Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

Germanium telluride (GeTe) is a chemical compound of germanium and tellurium and is a component of chalcogenide glasses. It shows semimetallic conduction and ferroelectric behaviour.[2]

Germanium telluride exists in three major crystalline forms, room-temperature α (rhombohedral) and γ (orthorhombic) structures and high-temperature β (cubic, rocksalt-type) phase; α phase being most common.[3]

References

  1. ^ R. Tsu et al. (1968). "Optical and Electrical Properties and Band Structure of GeTe and SnTe". Phys. Rev. 172 (3): 779–788. doi:10.1103/PhysRev.172.779. 
  2. ^ A. I. Lebedev, I. A. Sluchinskaya, V. N. Demin and I. H. Munro (1997). "Influence of Se, Pb and Mn impurities on the ferroelectric phase transition in GeTe studied by EXAFS". Phase Transitions 60: 67. http://semiconductors.phys.msu.su/publ/phtr.html. 
  3. ^ E. I. Givargizov, A.M. Mel'nikova (2002). Growth of Crystals. Birkhäuser. p. 12. ISBN 0306181215. http://books.google.com/?id=umUyWSUgRYgC&pg=PA12.