Abstract
The influence of oxygen pressure on phase equilibria during thermal dissociation in the Ln-Mn-O (Ln = Sm, Tb, Dy, Yb, and Lu) systems was studied by the static method on a vacuum circulation unit with subsequent X-ray analysis of quenched solid phases. The reduction of the double oxides was found to occur according to the reactions LnMn2O5 = LnMnO3 + (1/3)Mn3O4 + (1/3)O2, LnMnO3 = (1/2)Ln2O3 + MnO + (1/4)O2, for which the temperature dependences of equilibrium oxygen pressure were determined over the temperature range 973–1220 K. The Gibbs energies of dissociation of the double oxides were calculated. Interrelation between the type of lanthanides and the thermal properties of the compounds was analyzed.
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