Abstract
The thermodynamic properties of two yttrium manganese complex oxides, h-YMnO 3 and YMn 2O 5, were assessed. They were both treated as stoichiometric compounds. An optimized set of parameters of Gibbs energy functions is proposed. According to our calculation, in air, YMn 2O 5 is stable from room temperature up to 1461 K. Then it decomposes into h-YMnO 3 and β-Mn 3O 4. h-YMnO 3 is stable above 1062 K. At lower temperature, it decomposes into YMn 2O 5 and α-Y 2O 3. At 2067 K, it melts incongruently. A complete thermodynamic description of the Mn–Y–O system is proposed. The MnO x –YO 1.5 phase diagram in air and three isothermal sections of the Mn–Y–O system are presented.
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