Chemical and physical properties of the solid products of thermal decomposition of copper(II) and nickel(II) permanganates

Abstract

The thermal decomposition of copper and nickel permanganates has been studied up to 1100 K with a view to the formation of catalytically active mixed oxides. XRD, TG and magnetic moment determinations have been used to characterize the reaction products. Both compounds produce an amorphous, high surface area intermediate at low temperatures. The copper series crystallizes to the inverse spinel CuMn ₂ O ₄ below 725 K, while the nickel series produces NiMnO ₃ at 725 K and the inverse spinel at 1100 K.