The physical and chemical properties of bismuth oxide
Bismuth oxide, also known as bismuth trioxide, is a yellow powder, insoluble in water, but soluble in strong acid to form bismuth (III) salt, with the molecular formula Bi2O3. The pure product has α type, β type, and δ type. α type is yellow monoclinic crystal, relative density 8.9, melting point 825 ℃, soluble in acid, insoluble in water and alkali; β type is bright yellow to orange, tetragonal crystal system, relative density 8.55, melting point 860 ℃, soluble Acid, insoluble in water. It is easily reduced to metallic bismuth by hydrogen, hydrocarbons, etc.; δ-Bi2O3 is a special material with a cubic fluorite ore structure. 1/4 of the oxygen ion position in its crystal lattice is vacant, so it has a very high oxygen ion conductivity. The main application objects of bismuth oxide are electronic ceramic powder materials, electrolyte materials, photoelectric materials, high-temperature superconducting materials, and catalysts. As an important additive in electronic ceramic powder materials, bismuth oxide is generally required to have a purity of more than 99.15%. The main application objects are zinc oxide varistors, ceramic capacitors, and ferrite magnetic materials.
Application of bismuth oxide
Bismuth oxide can be used to prepare bismuth salts; used as electronic ceramic powder materials, electrolyte materials, photoelectric materials, high-temperature superconducting materials, and catalysts. As an important additive in electronic ceramic powder materials, bismuth oxide is generally required to be above 99.15% purity. The main application objects are zinc oxide varistors, ceramic capacitors, and ferrite magnetic materials; as well as glaze rubber compounding agents, medicines, Red glass compounding agents, etc.
Preparation method of bismuth oxide
To the bismuth nitrate solution (80-90°C), an aqueous sodium hydroxide solution containing no carbon dioxide was added dropwise and mixed. The solution remains alkaline during the precipitation process, and a white, volume-swelling bismuth oxide hydrate Bi(OH)3 precipitates. This solution is heated and stirred for a short time to be dehydrated into yellow bismuth trioxide. After washing with water decantation, filtering, and drying, the finished bismuth oxide product is obtained.
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