What property does Bismuth Telluride have?
Bismuth-telluride, a powdery gray substance with the formula Bi2Te3, is a material that contains a high concentration of bismuth. Bismuth telluride, a semiconductor, has a good electrical conductivity but mediocre thermal conductivity. It is not fatal to consume large quantities of bismuth, but it can cause serious harm if ingested. The material is able to allow electrons on its surface to move at room temperatures without using energy, which can lead a significant increase in the operating speeds of the chip.
What is the preparation method of Bismuth Teluride?
Bismuth Telluride Powder Materials can be made into many commonly used devices. There are several commonly used methods of preparation: the zone melting method (Bridgeman), single crystal pulling technique, plasma-activated sintering and hot press Sintering.
1. Zone melting method is a way to grow single crystalline crystals through melting and crystallization polycrystalline ingots. The rod-shaped ingot of polycrystalline material is melted only in a small area. The rest of it is kept solid.
2. Bridgman method is a method of crystal growth that is commonly used. It’s also known as crucible descending. This method involves putting the crystal-growing material in a crucible that is shaped like a cylinder and passing it slowly through a resistance furnace or high-frequency oven with a gradient of temperature. The temperature of a furnace should be a little higher than the melting points of crystal materials. The melting of crystal material occurs when the crucible drops into the heating center. If the crucible falls slowly after passing through this center, it is the temperature in the bottom that begins to decrease. This method works best with common ionic compound, like halides of metals such as alkali and earth metals.
3. Czochralski technique: Chukraski, in 1917, invented this method to produce high-quality single Crystals from the melt. This method involves putting crystal material into the crucible. Use the pull rod after the crystal melts and heats the crucible.
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