Bismuth telluride
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| Bismuth telluride | |
|---|---|
| Identifiers | |
| CAS number | [1304-82-1] |
| Properties | |
| Molecular formula | Bi2Te3 |
| Molar mass | 800.761 g/mol |
| Appearance | grey powder |
| Density | 7.7 g/cm3 |
| Melting point |
573 °C |
| Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) Infobox disclaimer and references |
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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. The CAS registry number is []. The density is 7700 kg.m-3. It has a melting point of 573 °C.
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.[1]
- A high electrical conductivity. The electrical conductivity of N-type bismuth telluride is 1.1 × 105 Siemens per meter.[1]
- 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.[2]
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[edit] 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.
[edit] See also
[edit] References
- ^ a b c Thermoelectric properties of bismuth telluride thin films deposited by radio frequency magnetron sputtering
- ^ Thermal conductivity measurements of Bismuth Telluride thin films by using the 3 Omega method
- 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
