Thermal dissociation of the ErMn2O5 compound
Phase equilibria in the Er-Mn-O system have been studied by the static method on vacuum circulation setup at 1010–1160 K with subsequent X-ray diffraction analysis of the quenched solid phases with step-by-step removal of oxygen from the ErMn2O5 compound. It is established that ErMn2O5 dissociation occurs in three stages. The temperature dependences of the equilibrium oxygen pressure are experimentally determined for the found phase equilibria. The changes in the standard thermodynamic functions of the reactions of dissociation and formation of ErMn2O5 and ErMnO3 from elements are calculated.