Introduction of bismuth telluride Bismuth telluride is a gray powder with the molecular formula Bi2Te3. At room temperature and pressure, bismuth telluride is a gray powder, a rhombohedral crystal system with a space group. Bismuth telluride is a semiconductor material with good electrical conductivity but poor thermal conductivity. For over half a century, scientists have conducted systematic and extensive research on thermoelectric materials, among which bismuth telluride and its solid solution are the earliest and most mature materials studied. Due to the excellent physical properties of bismuth telluride, the research on bismuth telluride has never stopped.
Characteristics of Bismuth Telluride Bismuth telluride is a semiconductor compound of elements of the periodic table's main groups, V and VI. It is a triangular crystal with a rhombic hexahedron protocell, a lattice constant of 1.0473nm, and a density of 7.8587g/cm3. Melting point 585°C. Covalent bonds with some ionic bonding components bind bismuth telluride. Bismuth telluride is an indirect band gap semiconductor with room temperature forbidden bandwidth of 0.145eV, electron and hole mobility 0.135 and 4.4×10-2m2/(V-s), respectively, and temperature difference electric quality factor 1.6×10-3/K. Bismuth telluride was prepared by the Bridgman method, regional melting method and directed pulling method.
Research application of bismuth telluride thermoelectric material Thermoelectric material is a functional material based on the Seebeck and Paste effects to directly convert electric and thermal energy. Thermoelectric materials have become the key materials for prospective and strategic new energy technologies such as thermoelectric cooling and power generation. Bismuth telluride-based alloy material, as the best thermoelectric material near room temperature, has been widely used in aerospace, microelectronics, special power supply and other fields. Since the low thermoelectric properties of bismuth telluride-based thermoelectric materials in the low and medium temperature region of 200-300°C limit their further broadening of applications, it is of great practical significance to research optimizing the thermoelectric properties of bismuth telluride based thermoelectric materials in the low and medium temperature region. The properties of the Seebeck coefficient, electrical conductivity, and thermal conductivity of Bi2Te3 are all functions of temperature and all change with temperature. At temperatures below -196.56 °C, carrier scattering is mainly controlled by the dissociated impurity mechanism and is largely independent of temperature; when the temperature is higher than -196.56 °C, the scattering ability of carriers increases with the enhancement of lattice vibration, which causes the conductivity of Bi2Te3 to decrease subsequently, and the conductivity drops to the lowest value when the temperature is raised to 127 °C. The intrinsic excitation gradually becomes significant when the temperature is higher than 127 °C, and the conductivity gradually increases with the increase in temperature. Similarly, the Seebeck coefficient also tends to increase and then decrease with the increase of temperature. The change of carrier concentration is small when the temperature is not high, and the increase of the Seebeck coefficient mainly comes from the increase of scattering; when the temperature increases to the point that the effect of intrinsic excitation is greater, the Seebeck coefficient starts to decrease.
Types of bismuth telluride powder P-type bismuth telluride refers to bismuth telluride doped with antimony (doped Antimony) N-type bismuth telluride refers to bismuth telluride doped with selenium (doped Selenium) Applications: formation of P/N joints for semiconductor refrigeration, temperature difference power generation, etc. Technology docking: vacuum melting - crystal priming (directional crystal growth) - area melting - removal of ends. Particle size: granules or powder: around 1-3 mm or less than 1 micron.
Applications of bismuth telluride powder Bismuth telluride and its alloys are widely used as thermoelectric cooling materials. Bismuth telluride is used in semiconductors, electronic refrigeration and power generation. They are also the best materials for thermoelectric generators when the heat source temperature is moderate. Topological insulators are not conventional superconductors and cannot be used in super-efficient power lines because they can only carry very small currents. However, they pave the way for paradigm shifts in microchip development, leading to new applications in spintronics, where electron spin is used to carry information. Moreover, bismuth telluride is easy to produce and use in practical applications. This three-dimensional material can be fabricated by sophisticated semiconductor technology and easily doped to easily tune its properties. . Supplier of bismuth telluride powder Luoyang Tongrun Nano Technology Co. Ltd. (TRUNNANO) Luoyang City, Henan Province, China, is a reliable and high-quality global chemical material supplier and manufacturer. It has more than 12 years of experience providing ultra-high quality chemicals and nanotechnology materials, including Zinc sulfide, nitride powder, Zinc sulfide powder, sulfide powder, and 3D printing powder. If you are looking for high-quality and cost-effective bismuth telluride, you can contact us or inquire at any time.
