What is the application range of bismuth oxide Bi2O3 powder?

Bismuth trioxide (bismuth oxide) is an inorganic compound with the molecular formula Bi2O3. 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 system, relative density 8.55, melting point 860 ℃, soluble in Acid, insoluble in water. It is easily reduced to metal bismuth by hydrogen, hydrocarbons, etc.; δ-Bi2O3 is a special material with a cubic fluorite structure, and 1/4 of the oxygen ion position in its 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, optoelectronic materials, high temperature superconducting materials, and catalysts. As an important additive in electronic ceramic powder materials, bismuth oxide generally requires a purity of more than 99.15%. The main application objects are zinc oxide varistors, ceramic capacitors, and ferrite magnetic materials.

How to prepare bismuth trioxide

1. To the bismuth nitrate solution (80-90 degreeC), add dropwise the sodium hydroxide aqueous solution without carbon dioxide, and mix it. The solution remains alkaline during the precipitation process, and a white, volume-expanded bismuth oxide hydrate Bi(OH)3 precipitate is formed. The solution is heated and stirred for a short time to dehydrate and turn into yellow bismuth trioxide. Washed by water decantation, filtered and dried to obtain the finished product of bismuth oxide.

2. In a nitrogen atmosphere, a 1.5 mol/L aqueous sodium hydroxide solution without carbon dioxide was added dropwise to a 0.1 mol/L bismuth nitrate solution dissolved in 1 mol/L nitric acid (at 80-90° C.) to mix them. The solution remains alkaline during precipitation. Although white, volume-expanded bismuth oxide hydrate Bi(OH)3 precipitates, but after stirring in the hot solution for a while, it dehydrates and turns into pale yellow bismuth trioxide. It was washed 15 times by decantation with water free of air and carbon dioxide, filtered and dried.

3. After the metal bismuth is put into the graphite crucible and melted, under the flow of oxygen, an arc is formed between the graphite electrode and the metal liquid surface to heat and oxidize. To ensure a sufficient supply of oxygen, the crucible should be placed in a large container, and oxygen should be continuously fed. The reaction temperature is 750-800°C, and β-bismuth trioxide with a purity of more than 99.8% is rapidly produced. After the product is quenched in water or on a cold metal plate, a high temperature phase beta-type product can be obtained.

4. Slowly add the Bi(NO3)3·5H2O acid solution (20g dissolved in 2mol/L HNO3) into the excess sodium carbonate solution and stir vigorously. The Bi2O3CO3 precipitate was obtained, filtered, washed and dried. It was placed in an aluminum boat and heated at 650K for about 1.5h in the air to obtain β-Bi2O3

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

2BiONO3=Bi2O3+NO+NO2+O2

When the burning is over, it will turn into lemon yellow after cooling, which is the finished product.

6. Wash the surface of 16kg 99.9% industrial bismuth with a small amount of dilute nitric acid, and then wash off the surface nitric acid with conductive water. Then add 1:1 high-purity nitric acid (35kg of nitric acid with a relative density of 1.42 plus 20L of conductive water), add it with 1H, and continue to react for 10min after the addition. After a little cooling, filter, heat the filtrate to 65-70°C, evaporate and concentrate to a relative density of 1.9, crystallize by cooling, and spin dry to obtain bismuth nitrate. The obtained bismuth nitrate is dissolved into a dilute solution with conductive water, hydrolyzed under stirring, and allowed to stand for complete precipitation of the bismuth nitrate. , pulverized, burned at 500 ℃ for 7-8h, ground after a little cooling, then burned for 4-5h, after cooling, 99.99% high-purity bismuth oxide was obtained

Bismuth oxide Bi2O3 powder overview

Bi2O3 bismuth oxide powder is one of the most important bismuth compounds. It has excellent dielectric properties, high oxygen mobility, large energy gap, high refractive index, remarkable photoconductivity and photoluminescence, and is an advanced functional material ;

The pure products of bismuth trioxide are α-type and β-type. α-type is a 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 ℃, easily soluble in acid, insoluble in water. It is easily reduced to metal bismuth by hydrogen and hydrocarbons.

Application of bismuth oxide Bi2O3 powder

For the preparation of bismuth salts; as electronic ceramic powder materials, electrolyte materials, optoelectronic materials, high temperature superconducting materials, catalysts. As an important additive in electronic ceramic powder materials, bismuth oxide usually requires a purity greater than 99.15%. The main application fields are zinc oxide varistor, ceramic capacitor, ferrite magnetic material; and glaze rubber compounding agent, medicine, red glass compounding agent, etc.

Bismuth oxide Bi2O3 powder is widely used in electronic industry, chemical industry, glass industry, plastic industry, ceramic glaze and other material industries, such as electronic ceramic powder materials, electrolyte materials, magnetic materials, optoelectronic materials, high temperature superconducting materials, catalysts, fireproofing Materials (paper fireproof materials), nuclear reactor fuel, fireworks materials, radiation protection materials, ceramic packaging materials, etc.

Bismuth oxide Bi2O3 powder price

The price of Bi2O3 bismuth oxide powder will change randomly with the production cost, transportation cost, international situation and market supply and demand of Bi2O3 bismuth oxide powder. Tanki New Materials Co.,Ltd aims to help various industries and chemical wholesalers find high-quality, low-cost nanomaterials and chemicals by providing a full range 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.

Bismuth oxide Bi2O3 powder supplier

As a global bismuth oxide Bi2O3 powder supplier, 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 boron carbide, aluminum carbide, titanium carbide, etc.), high-purity target materials, functional ceramics and structural devices, and provides OEM services.