Formation and decomposition of BaCuO2.5 prepared from a mixture of nitrates

摘要: Phase relationships in a Ba-Cu-O system prepared from nitrates or acetates were determined as functions of calcination temperature. It was first proved that the BaCuO{sub 2.5} phase, which known to be obtained only peroxides, produced air at 650C when Ba(NO{sub 3}){sub 2}/Cu(NO{sub 2} mixture used precursor. From iodometric analysis, nitrate-derived sample found contain exclusively Cu{sup 3+} ions. This pseudobinary oxide high oxidation state decomposed easily into 2+{alpha}} ({alpha} = 0.07) by heating above 700C evacuating 400C.