What’s Bismuth Telluride’s property?
Bismuth informuride is gray powder having the molecular formula Bi2Te3. Bismuth Telluride is a semiconductor substance that has high thermal conductivity and good electrical conductivity. Although it is unlikely that bismuth informuride will cause any health issues, large quantities can prove fatal. The material is able to allow electrons on its surface to move at room temperatures without energy consumption. This will increase chip’s operating speed, and can even improve computer chips’ work efficiency.
What preparation methods are used to prepare Bismuth telluride?
Many common uses can be made of bismuth telluride powder material. Preparation methods that are most commonly used include: single crystal pulling, Bridgeman method or zone melting.
1. This is the zone melting method. It allows single crystal growth by melting and crystallizing polycrystalline ingots. This creates a rod-shaped ingot made of polycrystalline crystals. After melting the area in which the rod is formed, the remainder of the ingot remains solid. Next, the molten region is moved down the length of each ingot so that it melts and crystallizes again.
2. Bridgman Method: Also known as the “crucible descending” method, it is one of the most common methods for crystal growth. You place the crystal-growing material into a cylindrical vessel and let it slowly go through a heat furnace. It should not be higher than the melting temperature of crystal materials. Once the crucible with the crystal material reaches the furnace heating center, it begins melting. The temperature at the bottom drops first. If the melting point is lower, crystallization starts. This is most suitable for common alkali metal compounds like halides and alkaline Earth metals.
3. Czochralski technique: It was invented by Chukraski in 1917 and used to make single crystals of high quality. You need to first place the crystal material into the crucible. After the crystal has melted completely, heat the Crucible. Next, pull out the crystal material from the melting liquid. Under proper temperature control the remaining seed crystals are constantly rearranged and become crystals.
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