What property does Bismuth Telluride have?
Bismuth-telluride, a powdery gray substance with the molecular formula Bi2Te3, has a colorless or grayish appearance. Bismuth telluride, a semiconductor, has a good electrical conductivity but mediocre thermal conductivity. It is not fatal to consume large amounts of bismuth, but it can cause serious harm if consumed. The material is able to allow electrons on its surface to move at room temperatures without consuming energy, and this will improve the working speed of computer chips.
What is the preparation method of Bismuth Teluride?
Bismuth Telluride Powder Materials can be made into many commonly used devices. There are several common preparation methods: plasma activated sintering, hot pressing, Bridgman and zone melting.
1. Zone melting: This is a method for growing single crystals through melting and crystallization polycrystalline ingots. The rod-shaped ingot of polycrystalline material is melted only in a small area. The rest is kept solid.
2. Bridgman method is a method of crystal growth that is commonly used. It’s also called crucible descending. This method involves putting the crystal-growing material in a crucible that is a cylinder and passing it slowly through a high frequency furnace or resistance oven with a gradient of temperature. The temperature of a furnace should be slightly greater than the melting points of crystal materials. When the crucible contains the crystal material, it melts. If the crucible continues slowly to fall, after passing the center of heating of furnace, first the temperature begins to drop at the bottom. This method works best with common ionic materials, like halides of metals such as alkali and earth metals.
3. Czochralski method (also called Chukraski technique): Chukraski, in 1917, invented this method to produce high-quality single crystalline from the melt. This method is to place crystal material in the melting crucible. Use the pull rod after the crystal melts and heats the crucible.