How do you define property in Bismuth Telluride
Bismuth Telluride is a powder of gray with 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.
Which preparation techniques 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 crystals to be formed by melting or 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 zone is moved along its length so that any remaining ingot can be melted again and crystallized.
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. The furnace temperature should not be higher than that of the crystal. Once the crucible with the crystal material reaches the furnace’s heating center, it begins to melt. The temperature at the bottom drops first. If the melting temperature of the crystal material is lower, then the crystallizes until the entire furnace is cooled. This is most suitable for common alkali and alkaline ionic compounds.
3. Czochralski technique: This method was invented by Chukraski in 1917 and is used to make single crystals of high-quality from the melt. You need to first place the crystal material into the crucible. After the crystal has melted completely, heat the Crucible. Next, you will use the pullrod to remove the crystal. Under proper temperature control, any remaining seed crystals that were pulled during cooling are constantly rearranged and become crystals.
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