Bismuth telluride

Bismuth telluride

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CASNo = 1304-82-1
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Formula = Bi2Te3
MolarMass = 800.761 g/mol
Appearance = grey powder
Density = 7.7 g/cm3
MeltingPt = 573 °C
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Bismuth telluride (Bi2Te3) is a grey powder that is a compound of bismuth and tellurium also known as Bismuth(III) telluride. It is a semiconductor which is an efficient thermoelectric material for refrigeration or portable power generation.

Thermoelectric properties

N-type bismuth telluride is an efficient thermoelectric material due to its high Seebeck coefficient (voltage per unit temperature difference) of -287 μV/K. [http://adsabs.harvard.edu/abs/2005SPIE.5836..711T Thermoelectric properties of bismuth telluride thin films deposited by radio frequency magnetron sputtering] ] Its thermoelectric utility is also assisted by the combination of its high electrical conductivity of 1.1 × 105 Siemens per meter with its very low thermal conductivity of 1.20W/(m*K), similar to ordinary glass. [ [http://web.archive.org/web/20070628110900/http://www.jstp2006.kues.kyoto-u.ac.jp/CD-final-Data/papers/J113.pdf Thermal conductivity measurements of Bismuth Telluride thin films by using the 3 Omega method] ]

Occurrence

The mineral form of Bi2Te3 is tellurobismuthite which is moderately rare. There are many natural bismuth tellurides of different stoichiometry, as well as compounds of the Bi-Te-S-(Se) system, like Bi2Te2S (tetradymite).

ee also

* Thermoelectricity
* Thermoelectric effect

References


* The performance of bismuth telluride thermojunctions, H. J. Goldsmid, A. R. Sheard and D. A. Wright, Br. J. Appl. Phys. vol. 9 pp. 365-370 (1958) doi|10.1088/0508-3443/9/9/306

External links

* [http://www.electriccircuits.net/book,6,chapter,319,lesson,1470,thermoelectricity.aspx Thermoelectricity diagrams]
* [http://www.cam.net.uk/home/StKilda/electrolux.html How kerosene refrigerator works]
* [http://blog.modernmechanix.com/2005/11/18/kerosene-radio/
]
* [http://www.dself.dsl.pipex.com/MUSEUM/POWER/thermoelectric/thermoelectric.htm History of thermoelectric devices]
* [http://www.its.org/ International Thermoelectric Society]
* [http://www.zts.com/ Thermoelectric News]
* [http://www.tellurex.com/cthermo.html Tellurex thermoelectric module]
* [http://www.amerigon.com/thermoelectrics.php Amerigon]
* [http://www.espimetals.com/msds's/bismuthtelluride.pdf MSDS] at espimetals.com


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