Name: Bismuth oxide

Molecular formula: Bi2O3

Molecular weight: 465.96

CAS no. : 1304-76-3

The physical and chemical properties

Bismuth oxide, also known as bismuth trioxide, is a yellow powder, insoluble in water, soluble in strong acids to form bismuth (III) salts.Melting point 824°C, boiling point 1890 °C.It is one of the most important compounds of bismuth and can be reduced to metallic bismuth by hydrogen.Although bismuth trioxide can be obtained from a natural bismuth bloom (a mineral), its main source is usually a by-product of copper or lead smelting. Bismuth trioxide is obtained by burning bismuth powder in air.

Phase type

There are 4 main crystal phases and 2 non-stoichiometric phases of Bi2O3. The 4 main crystal phases are monoclinic phase (-bi2o3), square phase (-bi2o3), volume cubic phase (-bi2o3), and surface cubic phase (-bi2o3). The non-stoichiometric phases are bi2o2.33 and bi2o2.75.Delta and delta phases are stable phases at low temperature and high temperature respectively, while other phases are metastable phases at high temperature.

Use profile

Mainly used in fireworks industry, chemical industry (such as chemical reagent, bismuth salt manufacturing, etc.), glass industry (mainly used for coloring), electronic industry (electronic ceramics, etc.), welding, magnetic materials, etc.Among them, the electronic industry is the most widely used bismuth oxide industry, mainly used in varistor, thermistor, oxide arrester and picture tube and other fields.In addition, Bi2O3 has a high refractive index and dielectric constant, significant fluorescence characteristics and inertness.Therefore, Bi2O3 is a potential visible light catalyst for water decomposition and pollutant degradation.

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