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What property does Bismuth Telluride have?
The molecular formula for this powder is Bi2Te3. Bismuth telluride, an indirect band gap semiconductor, has a bandgap of 0.145eV at room temperature, electron mobility of 0.135m2/(V*s) and hole mobility of 4.×10-2m2/ (V*s), and a coefficient of thermoelectric quality of 1.6×10-3/K.
Bismuth Telluride is a dense material with a density 7.8587g/cm3 at a melting temperature of 585degC. It is bound with covalent and has an ionic bond. Bismuth telluride exhibits the characteristics of a topological insulate, allowing electrons flow freely over its surface.
The Bridgman method is one of the preparation methods for bismuth Telluride. Other methods include zone smelting and Czochralski. Bismuth telluride, a semiconductor, has a good electrical conductivity and mediocre thermal conductivity.
What is the use of Bismuth telluride?
Bismuth-telluride-based semiconductors have high performance thermoelectric conversion in the low- and mid-temperature range. These materials are widely used to control temperature and for local refrigeration in microelectronics. The applications of these devices are excellent in thermoelectric power generation and industrial waste heat recovery.
Through alloying, phonons scattering can improve to reduce thermal conductivity and carrier concentration to optimize the electrical performance. This will enhance the thermoelectric performance.
The dangers of bismuth-telluride are low but it can be fatal in large doses. The material is able to allow electrons on its surface to move at room temperatures without consuming energy, which can lead a significant increase in the speed.
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