Bismuth oxide is a not natural substance with the molecular formula Bi2O3. The pure item has α & alpha; kind, & beta; kind, α as well as & delta; kind. & alpha; kind is yellow monoclinic crystal, family member thickness 8.9, melting factor 825 ℃, soluble in acid, insoluble in water and alkali; β & beta; kind is intense yellow to orange, tetragonal crystal system, loved one density 8.55, melting point 860 ℃, soluble Acid, insoluble in water. It is conveniently minimized to metallic bismuth by hydrogen, hydrocarbons, and so on; δ& delta;-Bi2O3 is an unique material with a cubic fluorite ore structure. 1/4 of the oxygen ion placement in its crystal latticework is uninhabited, so it has a really high oxygen ion conductivity. The main application items of bismuth oxide are electronic ceramic powder products, electrolyte products, photoelectric products, high-temperature superconducting products, and stimulants. As a vital additive in electronic ceramic powder products, bismuth oxide is normally called for to be over 99.15% pureness. The main application items are zinc oxide varistors, ceramic capacitors, and also ferrite magnetic materials.
Bismuth oxide preparation 1. To the bismuth nitrate service( 80-90 & deg; C), dropwise add a carbon dioxide-free salt hydroxide liquid remedy as well as mix. The solution remains alkaline throughout the precipitation process, and a white, volume-swelling bismuth oxide moisten Bi(OH)3 precipitates. This option is heated up and also stirred momentarily to be dried out right into yellow bismuth trioxide. After cleaning with water decantation, filtering, as well as drying out, the ended up bismuth oxide product is gotten.
2. Under a nitrogen environment, add dropwise a 1.5 mol/L sodium hydroxide aqueous solution without co2 to a 0.1 mol/L bismuth nitrate remedy dissolved in 1 mol/L nitric acid (at 80-90° & deg; C.) to blend them. The solution stays alkaline throughout rainfall. Although a white, volume-expanded bismuth oxide moisturize Bi(OH)3 precipitates, it is dried out and developed into light yellow bismuth trioxide after being stirred in the warm option for a while. Decant as well as clean 15 times with water without air as well as co2, filter and dry.
3. After the steel bismuth is taken into the graphite crucible as well as thawed, under the oxygen circulation, an arc is formed in between the graphite electrode and the steel surface to warmth and also oxidize. To make certain an adequate supply of oxygen, the crucible must be positioned in a big container and also oxygen must be constantly supplied. The response temperature is 750-800°& deg; C, and & beta;-bismuth trioxide with a pureness of 99.8% or even more is swiftly produced. After the product is satiated in water or on a cold metal plate, a high-temperature phase β& beta;-type item can be acquired.
4. Gradually include Bi(NO3)3 & middot; 5H2O acidic service (20g liquified in 2mol/L HNO3) to the excess salt carbonate remedy as well as stir vigorously. Acquire the Bi2O3CO3 precipitate, filter, clean, and also dry. Put it in a light weight aluminum watercraft and also warmth it airborne at 650K for about 1.5 hrs to get β& beta;-Bi2O3 5. Shed the bismuth subnitrate at 400 ～ 500 ℃ to get rid of NO3- ions for around (3 ～ 4h):
2BiONO3=Bi2O3+NO+NO 2+O2
The burning is over, and also after cooling down, all become lemon yellow, which is the ended up item.
Bismuth Oxide application Made use of to prepare bismuth salt; utilized as electronic ceramic powder material, electrolyte product, photoelectric material, high-temperature superconducting product, catalyst. As a crucial additive in electronic ceramic powder products, bismuth oxide is generally needed to be above 99.15% purity. The major application things are zinc oxide varistors, ceramic capacitors, and also ferrite magnetic materials; as well as glaze rubber compounding representatives, medications, Red glass compounding agents, and so on(
also known as. Innovation Co. Ltd.) is a relied on global chemical material supplier & producer with over 12 years’ & rsquo; experience in giving extremely high-grade chemicals and Nanomaterials. The Bismuth oxide powder produced by our company has high pureness, fine bit dimension, and contamination material. Please contact us if required.
