Bismuth subcarbonate 2CO3, sometimes written Bi2O2 is a chemical compound of bismuth containing both oxide and carbonate anions. Bismuth is in the +3 oxidation state. Bismuth subcarbonate occurs natur

Bismuth oxide is a compound of bismuth, with the chemical formula Bi2O3. It has seen extensive study for its ionic conductivity, but its most mature use is as a colorant in pyrotechnics.