Bismuth telluride
| Crystal structure | |||||||||||||||||||
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| __ Bi 3+ __ Te 2− | |||||||||||||||||||
| General | |||||||||||||||||||
| Surname | Bismuth telluride | ||||||||||||||||||
| other names |
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| Ratio formula | Bi 2 Te 3 | ||||||||||||||||||
| Brief description |
gray powder |
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| properties | |||||||||||||||||||
| Molar mass | 800.76 g mol −1 | ||||||||||||||||||
| Physical state |
firmly |
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| density |
7.642 g cm −3 |
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| Melting point |
573 ° C |
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| safety instructions | |||||||||||||||||||
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| Thermodynamic properties | |||||||||||||||||||
| ΔH f 0 |
−78.7 kJ mol −1 |
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| As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions . | |||||||||||||||||||
Bismuth telluride is a chemical compound from the telluride group .
Occurrence
Bismuth telluride occurs naturally in the form of the rare mineral tellurobismutite .
properties
The compound has a rhombohedral crystal structure with the space group R 3 m (space group no. 166) . A hexagonal cell contains 15 atoms grouped in three layers.
use
Bismuth telluride has semiconductor properties and is used for thermocouples and as a Peltier element to cool microchips.
Individual evidence
- ↑ Data sheet Bismuth telluride, powder and pieces ( Memento from July 10, 2012 in the web archive archive.today ) at Materion Advanced Chemicals Inc., accessed on January 22, 2012.
- ↑ a b c d data sheet Bismuth telluride from Sigma-Aldrich , accessed on May 20, 2011 ( PDF ).
- ↑ M. Binnewies, E. Milke: Thermochemical Data of Elements and Compunds . 2nd Edition. Wiley-VCH, Weinheim 2002, ISBN 3-527-30524-6 , pp. 828 .
- ↑ Tellurobismutite. In: mineralienatlas.de. Stefan Schorn, accessed on January 2, 2019 .
- ↑ B. Yu. Yavorsky et al. : Electronic structure and transport anisotropy of Bi 2 Te 3 and Sb 2 Te 3 . In: Physical Review B . tape 84 , no. October 16 , 2011, p. 165–208 , doi : 10.1103 / PhysRevB.84.165208 , arxiv : 1109.0186 .
- ↑ Christof Windeck: Thermoelectric coolers against processor hotspots. In: heise.de . January 27, 2009, accessed January 2, 2019 .