Silver(I,III) oxide is a chemical compound used as part of the manufacture of silver oxide-zinc alkaline batteries. It has an empirical formula AgO, which might suggest that silver is in the +2 oxidation state. However, AgO is diamagnetic and X-ray diffraction studies show that silver atoms have two different coordination environments, one having two collinear oxide neighbours and the other four coplanar oxide neighbours.. AgO is therfore formulated as AgIAgIIIO2. It is also known as silver peroxide, although it does not have peroxide (O22−) anions. It can be prepared by the slow addition of a silver(I) salt to a persulfate solution e.g. AgNO3 to a Na2S2O8 solution.