Abstract
Phase equilibria in the Tb-Mn-O system during the removal of oxygen from the TbMn2O5 compound in stages were studied by the static method on a vacuum circulation unit (973–1173 K) with subsequent X-ray analysis of quenched solid phases. The dissociation of TbMn2O5 was found to occur in three stages. The temperature dependences of equilibrium oxygen pressure were determined experimentally for the phase equilibria observed. The standard thermodynamic functions of the dissociation and formation from the elements of TbMn2O5 and TbMnO3 were calculated.
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