Germanium telluride
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| Germanium telluride | |
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| Identifiers | |
| CAS number | 12025-39-7  |
| PubChem | 16213264 |
| ChemSpider | 74888 |
| Jmol-3D images | {{#if:[Te]=[Ge]=[Te]|Image 1 |
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| 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 |
(verify) (what is: / ?)Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 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 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
- ↑ 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.
- ↑ 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.
- ↑ E. I. Givargizov, A.M. Mel'nikova (2002). Growth of Crystals. Birkhäuser. p. 12. ISBN 0-306-18121-5.
- ↑ 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.
- ↑ 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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