Overview and preparation method of bismuth oxide

Overview of Bismuth Oxide

 The bismuth oxide is a pale yellow powder at room temperature, orange when heated, and continues to be heated to reddish brown, which still becomes light yellow after cooling. Bismuth oxide is insoluble in alkali and water, but soluble in acid to form form salt, and is easily reduced by C and CH 4, and has a melting point of 824°C and a boiling point of 1890°C. Cerium oxide mainly exists in α, β, γ and δ, among which the four crystal forms of α-BIO 3 are monoclinic crystal system, β-BIO3 is tetragonal crystal, and α-Bi system 2 ö 3 and β-Bi system 2 ö 3 It is a cubic crystal. Each crystal type of yttrium oxide has its special structure and properties. For example, due to the phase composition, the band gap can be changed from 2 eV to 3.96 eV, where the band gap of the α phase is 2.85 eV and the band gap of the β phase is 2.58 eV.

The density of yttrium oxide also changes with the crystal form: monoclinic crystals are 8.2 g·cm 3, and tetragonal crystals are 8.55 g·cm 3 and 8.9 g·cm 2 cubic crystals 3. The monoclinic structure of α-BiO3 is a low temperature stable phase, while the cubic structure of δ-BiO3 is a high temperature stable phase, and the other two crystal types are metastable crystal types.

 Preparation method of nano bismuth oxide

 At present, researchers have developed a variety of methods for preparing nano-bismuth oxide, which can be summarized as solid phase, gas phase and liquid phase. In recent years, through the continuous improvement of related technologies, researchers have prepared more and more nano-bismuth oxides with different forms. Compared with the previous performance, the performance of these nano-bismuth oxides has not been greatly improved, and its application range is also expanding. The following briefly analyzes three methods of preparing nano-bismuth oxide: solid phase method, gas phase method and liquid phase method.

 (1) Solid phase method

The solid phase method is a relatively traditional powder preparation method. It usually makes the reaction reagents react in the solid phase to easily reach the reaction conditions, and the reaction process is not complicated. However, the disadvantage is that the obtained product is relatively easy to form agglomerates and particles The size is not uniform enough. In some industrial production areas, due to low product quality requirements, this preparation method is still the main choice.

When preparing nano-cerium oxide, it is usually selected to mix, grind, and calcinate several materials participating in the reaction at a certain temperature, and finally the required nano-cerium oxide material can be obtained. For example, Hong Weiliang et al. Mix (BiNO3) 3 • 5H 2 O and NaOH thoroughly and uniformly, add a certain dispersant and grind, and then heat in a water bath while keeping the temperature at 60°C. After a series of treatments, the solution is finally obtained. The required nano cerium oxide has a polygonal shape and a particle diameter of about 60 nm.

(2) Gas phase method

The gas phase method refers to a method of preparing desired nanomaterials by subjecting substances to physical and chemical reactions in a gaseous state. Since the gas phase method is carried out at high temperature and lack of liquid during the reaction process, this method is suitable for preparing nanopowders. The product prepared by the gas phase method has small particle size, low agglomeration degree, high purity, and easy control of product components, but the reaction conditions are difficult to control and the reaction equipment requirements are strict, so this method is not easy to implement. .

The spray combustion method is an important gas phase method. The principle is to heat the metal to melt it until an aerosol is generated, and then a strong oxidation reaction occurs by burning a small metal object in the reaction furnace, thereby forming a nano metal oxide powder from a high-pressure gas flow. For example, Kim et al. The B-Bi2O3 nanowires with a diameter of about 30-90 nm were successfully synthesized at a certain temperature, and the temperature was continuously increased. They obtained the BiO3 film-like structure.

(3) Liquid phase method

The liquid phase method is the most mature technology and the most widely used nanomaterial preparation method. The liquid phase method can selectively prepare nanomaterials with different microscopic morphologies and material compositions, and the uniformity of the prepared nanomaterials is generally good. However, the disadvantage of this method is that it is easy to introduce impurities into the preparation process, so this method is generally not suitable for applications with high product purity. With the introduction of new technologies such as microwave radiation and ultrasonic methods, the technology of preparing nanomaterials by liquid phase method has also made great progress. Generally, there are many types of liquid-phase methods, mainly including freeze-drying, hydrothermal synthesis,

Application of bismuth oxide Bi2O3 powder

Used to prepare bismuth salt; used as electronic ceramic powder materials, electrolyte materials, photoelectric materials, high-temperature superconducting materials, and catalysts. As an important additive of 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; as well as glaze rubber compounding agents, drugs, red glass compounding agents, etc.

Bismuth oxideis 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 ( Fireproof paper), nuclear reactor fuel, firework materials, radiation protection materials, ceramic packaging materials, etc.

The price of bismuth oxide Bi2O3 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 Bi2O3 powder

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