What is bismuth telluride?
Bismuth telluride has the characteristic of a topological insulator, allowing electrons to flow freely over its surface without any energy loss. Topological insulators are not conventional superconductors, nor can they be used in ultra-efficient power lines because they can only carry small amounts of current. Still, they pave the way for a paradigm shift in microchip development that could lead to new spintronics applications using electron spin to carry information. Moreover, bismuth telluride is easy to produce and use in practical applications. The three-dimensional material can be made using established semiconductor technology and is easily doped, so its properties can be easily tuned.
Hydrothermal synthesis of bismuth telluride powder and its thermal stability
By changing the experimental conditions, the single-phase Bi2Te3 powder was synthesized at 130 ~ 200℃, and the concentration of NaOH solution was 2 ~ 8 mol/L. The phase composition, morphology, crystal structure, and thermal stability of the product were studied by X-ray diffraction (XRD), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM), energy dispersive spectrometer (EDAX) and thermal analysis system (TG-DTA). The results show that the concentration of NaOH solution is not only an essential factor for the synthesis of pure Bi2Te3 powder but also affects the crystal morphology and grain size of the obtained Bi2Te3 powder at a specific reaction temperature without the addition of surfactant. When the concentration of NaOH solution is low and the reaction temperature is high, Bi2Te3 is formed by atom binding, and vice versa; Bi2Te3 is formed by ion binding. The general formation mechanism is helpful for the synthesis of tellurides by hydrothermal or solvothermal methods in the future, and the study of thermal stability puts forward new requirements for experimental results.
The invention relates to a preparation method of bismuth telluride based thermoelectric material
The invention relates to a preparation method of bismuth telluride-based thermoelectric material, which includes :(1) bismuth telluride-oriented polycrystalline rod is prepared by a zone melting process at a melting temperature of 700-800℃ with a temperature gradient of 25℃/mm; (2) Soak the polycrystalline rod in hydrofluoric acid solution first, and clean it with alcohol and deionized water until the surface pH is 7; Finally dry in a vacuum; Then crush and sift; The powder was pretreated by an ultrasonic wave before sintering. (3) Rapid sintering by discharge plasma under vacuum or inert atmosphere, sintering temperature range of 360-510℃, the heating rate of 20-200℃/mm, sintering time of 10-60min, the pressure of 20-120MPa. Based on ensuring that the thermoelectric conversion performance is equivalent to that of the zone-oriented polycrystalline material, the utilization rate of the material, the machinability, and the reliability of the product can be greatly improved, and the production cost can be significantly reduced, so that the invention has a good industrialization prospect.
Price of bismuth telluride
Bismuth telluride particle size and purity will affect the product's Price, and the purchase volume can also affect the cost of Bismuth telluride. A large amount of large amount will be lower. The Price of bismuth telluride is on our company's official website.
Bismuth telluride supplier
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