Bismuth oxide is yellow heavy powder or monoclinic crystal, which is odorless and stable in air. There are two types for pure bismuth trioxide, α type and β type. α-bismuth(III) oxide is yellow monoclini crystal with relative density 8.9 and melting point 825℃, which is soluble in acid, however not soluble in water and alkali. β-bismuth(III) oxide is bright yellow to orange tetragonal powder with relative density 8.55 and melting point860℃, which is soluble in acid, however not soluble in water. They can reduced to bismuth metal by hydrogen and hydrocarbon. Bismuth nitrate or bismuth metal is the raw material.
Bismuth Oxide
| CAS No.:1304-76-3 | EINECS No.:215-134-7 | Molecular Formula:Bi2O3 | Molecular Weight:465.96 |
| Density:8.9 | Melting Point:825℃ | Boiling Point:1890℃ | Flash Point:1890℃ |
Applications
Bismuth trioxide is raw material for catalysts, ceramic pigments and bismuth salts as bismuth chloride , bismuth vanadate , bismuth germanate , bismuth tungstate, sodium bismuthate, bismuth iodide and bismuth fluoride .
Bismuth oxide sputtering targets are valued for their unique electrical, optical, and catalytic properties, making them an essential material in the production of thin films across various high-tech industries. Composed of high-purity Bi2O3, these sputtering targets are primarily used in physical vapor deposition (PVD) processes to create coatings on substrates for applications in electronics, optics, energy storage, and environmental technology. Bi2O3‘s excellent dielectric properties, high refractive index, and environmental stability make it suitable for advanced applications that require precision and reliability.
In electronics, bismuth trioxide sputtering targets are utilized for manufacturing capacitors and varistors. Bi2O3‘s strong dielectric characteristics improve the energy storage and durability of multilayer ceramic capacitors (MLCCs) used in smartphones, computers, and other electronic devices. Additionally, Bi2O3 is essential in varistors, where it protects electronic circuits by absorbing voltage surges, ensuring the safety and longevity of electronic components.
In the optical field, Bi2O3 coatings are applied to lenses and optical filters due to their high refractive index. These coatings enhance light management in optical instruments, including cameras, microscopes, and scientific equipment, by improving the transmission and clarity of images. Bi2O3 is also used in anti-reflective coatings and optical waveguides, essential in photonics and telecommunication devices.