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Bismuth telluride



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. The CAS registry number is [1304-82-1]. The density is 7700 kg.m-3. It has a melting point of 573 C.

Additional recommended knowledge

The properties relevant to thermoelectric efficiency are:

  • A high Seebeck coefficient (voltage per unit temperature difference). The Seebeck coefficient of N-type bismuth telluride is -287 μV/K[1] Seebeck coefficient of P-type Bismuth Telluride is 81μV/K[2]
  • A high electrical conductivity. The electrical conductivity of N-type bismuth telluride is 1.1 × 105 Siemens per meter.[3]
  • Low thermal conductivity. The thermal conductivity of bismuth telluride is 1.20W/(m*K) giving the compound a thermal insulation value similar to ordinary glass.[4]

Toxicity

Although generally a low risk compound, it can be toxic; fatal if large doses are ingested. Avoid breathing the dust. A reaction with water may release toxic fumes. Material safety data sheets should be consulted.

References

  1. ^ [1],
  2. ^ [2]
  3. ^ [3]
  4. ^ [4] (dead link as of Oct 9, 2007)
  • 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
 
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Bismuth_telluride". A list of authors is available in Wikipedia.
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