Formation of Copper–Manganese Oxides from CuxMn1−x(HCOO)2·2H2O Mixed Crystals

It has been established that two series of mixed crystals are formed in the Cu(HCOO)2–Mn(HCOO)2–2H2O system at 25°C. The thermal decompositions of CuxMn1−x(HCOO)2·2H2O mixed crystals (0≤x≤0.5) have been studied. On the basis of the methods used (TG, DTA, and X-ray diffraction analysis), it has been established that homogeneous and heterogeneous oxide phases are obtained depending on thex-values. At about 300°C the formates decompose to Mn5O8(x=0); Cu0.4Mn4.6O8(x=0.08); a mixture of Cu0.4Mn4.6O8and Cu1.5Mn1.5O4with a different ratio (0.08