Sequence of Phase Equilibrium States in the DyMnO System
during Thermal Dissociation of the DyMn₂O₅ Compound

L. B. Vedmid’, V. F. Balakirev, A. M. Yankin, and Yu. V. Golikov

State Institute of Metallurgy, Ural Division, Russian Academy of Sciences,
ul. Amundsena 101, Yekaterinburg, 620016 Russia

Received December 8, 2004

Abstract—The phase equilibria attained in the Dy–Mn–O system during step-by-step removal of oxygen from
the DyMn₂O₅ compound are investigated using the static method (vacuum circulation setup, T = 725–950°C)
and X-ray powder diffraction analysis of quenched solid phases. It is found that dissociation of DyMn₂O₅ pro-
ceeds in three stages. The temperature dependences of the equilibrium oxygen pressure for the revealed phase
equilibria are determined experimentally. The changes in the standard thermodynamic functions of the reac-
tions of dissociation and formation of DyMn₂O₅ and DyMnO₃ from the oxides are calculated.

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