Antimony tetroxide, also known as antimony tetraoxide or antimony(III,V) oxide, is a chemical compound. Its chemical formula is Sb2O4. It has antimony and oxide ions in it. The antimony is both in the +3 and the +5 oxidation state.
Antimony tetroxide is a white solid. It is an oxidizing agent. It turns yellow when heated and turns white again when cooled.