The properties, preparation and common applications of bismuth trioxide

Bismuthtrioxide Bi2O3 – An important functional substance, it is found mostly in the 4 crystal types: roof, net and. Different crystal types are able to be applied in different ways. Leume type, a yellow monoclinic crystalline with an 8.9 relative density and an 825 melting-point is available. It is non-soluble in acids and water, but it can dissolve in alkali. Cubic crystal of bright yellow and orange with an relative density of 8.55. The melting point is 860. This substance can dissolve in acid but it cannot be dissolved in water. The metal bismuth can easily be reduced by hydrocarbon or hydrogen. Bi2o3 (a specific material having a cubic fluorite structural, in which 25% of the oxygenions in the crystal are unoccupied) has very high oxygen ions conductivity. Bismuth dioxide is used in the manufacture of electronic ceramic powder materials, electrolytes, photoelectric materials and catalysts. A key additive for electronic ceramic materials is bismuth. Its purity must exceed 99.15%. The principal application objects of bismuth ore are the three main categories: zinc oxide varistors; ceramic capacitors; and ferrite magniti materials. There are many uses for bismuth, including as an organic synthesis and medical catalyst. Also, the material is used to make nuclear fuel and high-refractive glasses.
The synthetic method
It was mixed with sodium hydroxylide water solution without carbon dioxide to make bismuth Nitrate solution (8090). In the precipitation process, the solution was still alkaline. The result was Bi(OH 3) precipitation of white or expanded bismuth oxy hydrate. Once the solution had been heated up, stirred for just a moment, and finally dried to make yellow bismuth trioxide. By water decanting, the bismuthoxide was filtered and dried.
Use 1.5mol/L sodium chloride solution to dissolve carbon dioxide. Mix it with 0.1mol/L bismuth-nitrate solution in 1mol/L acid at 80 90. The solution stays basic even after precipitation. The solution formed as a white-colored, extended Bi(OH3)3 deposit. After it was stirred in hot water, the bismuth triooxide became pale yellow. Then rinse the solution 15 times. After drying, dry the product with cold water.
After the melting of the metal bismuth, the graphite crucible was filled with oxygen. A rim was made between the graphite electro and the surface of the metal under flow. You must ensure that the oxygen is constantly supplied to the crucible. The reaction temperature was 800 750, and 99.8% purity. Once the products are cooled, either in hot water or on a piece of metal cold plate, they can be used for further processing.
Slowly mix the remaining sodium carbonate solution with Bi(NO3)3*5H2O acids solution (20g, dissolved in 2mol/L NNO3) and stir well. Bi2O3CO3 is precipitated. Filtered, washed, then dried. You can heat it up at 650K for 1.5 hours in an aluminum box.
5. You can burn the basic bismuth citrate at 400500 in order to get rid of NO3-ions (34h).
2 biono3 = 1 x Bi2O3 + 1 x NO + 2 + O2
After burning is complete, the entire batch turns to lemon yellow upon cooling.
6. You can clean an industrial bismuth surface 16kg99.9% using just a tiny amount of dilute citrate acid. Then, you should wash it with conductive saline to remove the nitric. You will then need to add the 1:1 high purity nitric (35kg of nitrate and 20, of the relative thickness of 1.42l. Water conductivity), for 10 min. Once the filtrate had reached 65 70°C, it was evaporated and concentrated until it reached a relative density (1.9). Once the filtrate had been cooled to 65 70, it was evaporated and concentrated to a relative density of 1.9. Once the dilute bismuth solution has been dissolved, heat it under stirring and let the filtrate dry. Next, wash the filter with thermal conductivity water several times.
Application form
1. Electrofunctional material
Electronic functional powders such as bismuth dioxide powder are widely used to make sensitive parts, dielectric ceramics, and other electronic components. It is easy to work with, it can be produced in small quantities and offers a high level of quality. Alpha Bi2O3 has the best monocline structural stability. There are large amounts of oxygen in its crystal structure. Furthermore, it is highly conductive and contains lots oxygen vacancy. These properties make it ideal for creating solid oxide fuel cells, as well oxygen sensors. This active substance is often used for chemical power supply. Bismuth oxide can also be used for corrosion prevention for mercury-free battery, as well as electrode material for lithium and an additive to improve alkaline Zn/MnO2’s rechargeability. This material was used as an ingredient in EMD, which is the active component of the positive electrode of primary batteries. The battery’s ability to recharge was shown to be superior than the conventional bismuthoxide.
2. Combustion catalyst
Lead oxide plays an important part in double base solid propellant burning rates catalyst. While it can boost the burning rate, decrease pressure exponent and improve propellant’s burning efficiency, its toxicity is much greater. This could cause a potential or direct harm to human health or the environment. Bismuth compound has a very low toxicity, lower smoke emissions, and high burning rate. It was found that the low propellant section, nano Bi2O3, has an increase in the rate of fuel burning than nano PbO. These results have replaced bright future with lead oxide nanometer Bismuth oxide.
3. The photocatalytic destruction of materials
The photocatalyst for treating nitrite-containing waste water is Bi2O3. Bi2O3’s photocatalytic activity is high, according to the results. A nanomaterial’s photocatalytic performance is enhanced because of its large specific surface, numerous surface active points, as well as high levels of photocatalytic activation.
4. It has been reported in the literature that the nanoparticles coated with bismuth oxide of sodium dodecylbenzenesulfonate have a large trivalent nonlinear optical coefficient, which is significant for the development of nonlinear optical devices even under weak light.
5. Urethane heparingraft copolymer (a medical material with an antithrombotic property) can be used to make interventional caths. You must fill the catheter with nano-bismuthoxide ultrafine powder. The material is incomperable to X rays.
6. Radiation-proof material.
Today’s radiation protection materials tend to be lead products. It is extremely harmful to the human body, as well as the environment. Bismuth (a green metal) has a greater attenuation value than lead. This combination, which combines strong radiation resistance from bismuth oxide and quantum effects of nanomaterials gives it high potential for use in development.

Cataniadagiocare (Cataniadagiocare advance material Tech Co., Ltd.), is a Bi2O3 specialist with over twelve years of chemical products research, design, and development experience. You can contact us to request high-quality Bi2O3.

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