Abstract
Measurements on a circulation static setup with subsequent XRD analysis of quenched solid phases were used to study phase equilibria implicated in the thermal dissociation of SmMn2O5over the temperature and pressure ranges from 973 to 1123 K and from 10−3 to 10−16 Pa, respectively. The thermal dissociation of SmMn2O5 results in the sequential formation of constant-composition phases: SmMn2O5 → SmMnO3 + Mn3O4 + O2 → SmMnO3 + MnO + O2 → Sm2O3 + MnO + O2. The temperature dependence of the equilibrium oxygen pressure for the observed monovariant phase equilibria was used to calculate the thermodynamic characteristics of dissociation and formation of SmMn2O5 and SmMnO3 from the elements.
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