Germanium telluride

Germanium telluride
Unit cell of rhombohedral germanium telluride under standard conditions. The purple atoms represent the germanium ions.
Unit cell of germanium telluride.
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.031.538
Properties
GeTe
Molar mass 200.21 g/mol
Appearance solid
Density 6.14 g/cm3
Melting point 725 °C (1,337 °F; 998 K)
Band gap 0.6 eV [1]
5
Structure
Rhombohedral, hR6
R3m, No. 160
a = 4.1719 Å, c = 10.710 Å[2]
161.430 Å3
Related compounds
Other anions
 Germanium monoxide
Germanium monosulfide
Germanium monoselenide
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

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.[3]

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 phase for pure GeTe below the ferroelectric Curie temperature of approximately 670 K.[4][5]

Doped germanium telluride is a low temperature superconductor.[6]

References

  1. ↑ R. Tsu; et al. (1968). "Optical and Electrical Properties and Band Structure of GeTe and SnTe". Phys. Rev. 172 (3): 779–788. Bibcode:1968PhRv..172..779T. doi:10.1103/PhysRev.172.779.
  2. ↑ doi:10.1002/pssb.201248412
  3. ↑ A. I. Lebedev; I. A. Sluchinskaya; V. N. Demin; 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. doi:10.1080/01411599708220051.
  4. ↑ E. I. Givargizov; A.M. Mel'nikova (2002). Growth of Crystals. Birkhäuser. p. 12. ISBN 0-306-18121-5.
  5. ↑ Pawley, G.; Cochran, W.; Cowley, R.; Dolling, G. (1966). "Diatomic Ferroelectrics". Physical Review Letters. 17 (14): 753. Bibcode:1966PhRvL..17..753P. doi:10.1103/PhysRevLett.17.753.
  6. ↑ Hein, R.; Gibson, J.; Mazelsky, R.; Miller, R.; Hulm, J. (1964). "Superconductivity in Germanium Telluride". Physical Review Letters. 12 (12): 320. Bibcode:1964PhRvL..12..320H. doi:10.1103/PhysRevLett.12.320.
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