Germanium telluride

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Germanium telluride
GeTeRhobohedral.jpg
Identifiers
CAS number 12025-39-7 YesY
PubChem 16213264
ChemSpider 74888 YesY
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 (1,337 °F; 998 K)
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
Except where noted otherwise, 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.[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 phase for pure GeTe below the ferroelectric Curie temperature of approximately 670 K.[3] [4]

Doped germanium telluride is a low temperature superconductor. [5]

References[edit]

  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. ^ 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. doi:10.1080/01411599708220051. 
  3. ^ E. I. Givargizov, A.M. Mel'nikova (2002). Growth of Crystals. Birkhäuser. p. 12. ISBN 0-306-18121-5. 
  4. ^ 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.  edit
  5. ^ 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.  edit