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What is bismuth oxid?
Bismuth oxide
The molecular formula of the inorganic compound is Bi2O3. The pure product comes in three types: a, b, and d. a type has a yellow monoclinic structure, relative densities of 8.9 and 825, melting points of 825, soluble acid, water, and alkali. b type, on the other hand, is a bright yellow-orange tetragonal system with relative densities 8.55 and 860, melting points 860, soluble acid, not soluble water. It can be easily converted to metallic Bismuth using hydrogen, hydrocarbons etc. It is a special material that has a cubic fluorite structure. The crystal lattice of d-Bi2O3 is void in 1/4, which gives it a high oxygen conductivity. Bismuth Oxide is mainly used for electronic ceramic powder materials. It can also be used as photoelectric materials, superconducting materials at high temperatures, and catalysts. Bismuth is an essential additive in electronic ceramic materials. Its purity must be at least 99.15%. Main application objects include ceramic capacitors, zinc oxide varistors, and ferrite magnet materials.
Bismuth Oxide preparation
1. Dropwise, add to the bismuth-nitrate solution at 80-90degC a sodium hydroxide-free aqueous solution. Mix. The solution is kept alkaline throughout the precipitation and white volume-swelling Bismuth Oxide Hydrate Bi(OH3) forms. This solution is heated, stirred and dehydrated to yellow.
Bismuth Trioxide
. After filtering and drying the bismuth oxide is obtained.
2. Mix them under a nitrogen-filled atmosphere by adding dropwise a 1,5 mol/L sodium hydroxide aqueous without carbon dioxide solution to a bismuth solution dissolved at 0.1 mol/L in 1 mol/L of nitric (at 80 to 90deg C). The solution stays alkaline throughout precipitation. The white volume-expanded Bismuth Oxide Hydrate Bi(OH)3 does precipitate, but it dehydrates and turns into light yellow Bismuth Trioxide when stirred for some time in the hot water solution. Decant the solution and wash it 15 times without adding air or carbon dioxide. Then filter and dry.
3. The graphite crucible is filled with metal bismuth and then melted. An arc is created between the graphite electrode surface and the metal surface under oxygen flow. For a continuous supply of oxygen to the crucible, it should be kept in an airtight container. The reaction is carried out at a temperature of 750-800degC and the b bismuth trioxide is generated quickly with a purity level of 99.8%. A high-temperature phase B-type product can then be obtained by quenching the product in water or a metal plate.
4. Stir vigorously as you add the acidic Bi(NO3)3*5H2O (20g dissolved 2mol/L in HNO3) solution to the excess sodium-carbonate solution. Filter, wash and dry the Bi2O3CO3 resulting precipitate. Place it in an aluminium boat and heat the air in it at 650K over about 1.5 hours.
5. Burn the Bismuth Subnitrate between 400500 for 34 hours to remove NO3 ions:
2BiONO3=Bi2O3+NO+NO2+O2
The final product is a lemon yellow color after cooling.
Bismuth Oxide is used in the application of Bismuth oxide
Bismuth oxide is used to prepare bismuth sal; it can also be used in electronic ceramic powder materials, electrolytes, photoelectric materials, high-temperature Superconducting Materials, and as a catalyst. Bismuth Oxide is an essential additive in electronic ceramic materials and must have a purity of at least 99.15%. Main application objects include zinc oxide varistors; ceramic capacitors and ferrite magnet materials. Other applications include glaze rubber compounding, medicine, Red Glass compounding, etc.
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