Preparation and application of bismuth oxide

Bismuth oxide preparation

1. Add dropwise an aqueous solution of sodium hydroxide without carbon dioxide to the bismuth nitrate solution (80-90°C), and mix well. The solution remains alkaline during the precipitation process, and the 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 decanting with water, filtering and drying, the finished bismuth oxide is obtained.

2. Under nitrogen atmosphere, add 1.5mol/L sodium hydroxide aqueous solution without carbon dioxide dropwise to 0.1mol/L bismuth nitrate solution dissolved in 1mol/L nitric acid (80-90℃) and mix. The solution is in the precipitation process Keep it alkaline. Although a white, volume-expanding bismuth oxide hydrate Bi(OH)3 will be precipitated, it will be dehydrated and become pale yellow bismuth trioxide after being stirred in a hot solution for a period of time. Decant and wash 15 times with air and carbon dioxide-free water, filter and dry.

3. After the metal bismuth is melted in a graphite crucible, the graphite electrode forms an arc with the metal surface under the oxygen flow, and is heated and oxidized. To ensure a sufficient supply of oxygen, the crucible should be placed in a large container, and oxygen should be continuously supplied. The reaction temperature is 750-800°C, and β-bismuth trioxide with a purity of 99.8% or more is quickly generated. After the product is quenched in water or on a cold metal plate, a high-temperature phase β-type product can be obtained.

4. Add Bi(NO3)3·5H2O acidic solution (20g dissolved in 2mol/L HNO3) slowly to excess sodium carbonate solution and stir vigorously. Obtain the Bi2O3CO3 precipitate, filter, wash, and dry. Place it in an aluminum boat and heat it in 650K air for about 1.5 hours to obtain β-Bi2O3

5. Burning bismuth subnitrate at 400 ~ 500 ℃ to remove NO3- ions (3 ~ 4h):

2BiONO3=Bi2O3 +NO+NO2+O2

After the combustion is over, all become lemon yellow after cooling, which is the finished product.

Overview of bismuth oxide Bi2O3 powder

Bismuth oxide is an inorganic compound with the molecular formula Bi2O3. The pure products are 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 in acid, Insoluble in water. It is easily reduced to metallic bismuth by hydrogen, hydrocarbons, etc.; δ-Bi2O3 is a special material with cubic fluorite ore structure. One quarter of the oxygen ion position in its crystal lattice is empty, so it has 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, catalysts, etc. As an important additive in electronic ceramic powder materials, bismuth oxide generally requires a purity of 99.15% or more. The main application objects are zinc oxide varistors, ceramic capacitors, and ferrite magnetic materials.

 bismuth oxide powder is one of the most important bismuth compounds.It has excellent dielectric properties,high oxygen fluidity,large energy gap,high refractive index,significant photoconductivity and photoluminescence,and is an advanced Functional materials;

The pure product of bismuth trioxide has α type and β type.The α type is yellow monoclinic crystal with a relative density of 8.9 and a melting point of 825°C.Soluble in acid, insoluble in water and alkali.β type is bright yellow to orange,cubic crystal system,relative density 8.55,melting point 860°C,soluble in acid but insoluble in water.Easily reduced to metallic bismuth by hydrogen,hydrocarbons,etc.

Application of bismuth oxide  powder

Used to prepare bismuth salt;used as electronic ceramic powder material,electrolyte material, photoelectric material,high temperature superconducting material,catalyst.As an important additive in electronic ceramic powder materials,bismuth oxide usually requires a purity greater than 99.15%.The main applications are zinc oxide varistors,ceramic capacitors,ferrite magnetic materials;and glaze rubber compounding agent,medicine,red glass compounding agent,etc.

Bismuth oxide  powder is widely used in the electronics industry,chemical industry,glass industry,plastic industry,ceramic glaze and other material industries,such as electronic ceramic powder materials,electrolyte materials,magnetic materials,photoelectric materials,high-temperature superconducting materials,catalysts ,Fireproof materials(firepro of paper),nuclear reactor fuel,firework materials,radiation protection materials,ceramic packaging materials,etc.

The price of bismuth oxide powder

The price of Bi2O3 bismuth oxide powder will vary randomly with the production cost, transportation cost, international situation, and the market supply and demand of Bi2O3 bismuth oxide powder. Tanki New Materials Co.,Ltd aims to help all industries and chemical wholesalers find high-quality, low-cost nanomaterials and chemicals by providing a full set of customized services. If you are looking for Bi2O3 bismuth oxide powder, please feel free to send an inquiry to get the latest price of Bi2O3 bismuth oxide powder.

Suppliers of bismuth oxide  powder

As a global supplier of bismuth oxide powder,Tanki New Materials Co.,Ltd has extensive experience in the performance,application and cost-effective manufacturing of advanced and engineered materials.The company has successfully developed a series of powder materials(including carbonization Boron,aluminum carbide,titanium carbide,etc.),high-purity targets,functional ceramics and structural devices,and provide OEM services.