Germanium telluride

Germanium telluride

Identifiers
CAS Number	12025-39-7
ChemSpider	74888
Jmol 3D model	Interactive image
PubChem	16213264
InChI InChI=1S/GeTe2/c2-1-3 Key: GPMBECJIPQBCKI-UHFFFAOYSA-N InChI=1/GeTe2/c2-1-3 Key: GPMBECJIPQBCKI-UHFFFAOYAU
SMILES [Te]=[Ge]=[Te]
Properties
Chemical formula	GeTe
Molar mass	200.21 g/mol
Appearance	solid
Density	6.14 g/cm^3
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
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).
verify (what is  ?)
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

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.
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.