Phase Equilibrium in the Er-Fe-O System at 1100℃
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概要
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Phase equilibrium was established in the Er-Fe-O system at 1100℃ by altering the oxygen partial pressure from -log(Po_2/atm)= 15.00 to 0, allowing construction of a phase diagram at 1100℃ for the system Er_20_3-Fe-Fe_2O_3. In the system, two ternary compounds, ErFeO_3 and Er_3Fe_50_12, were deemed stable and had nonstoichiometric composition, whereas ErFe_20_4 was not found to be stable. The present result was different from that of previous studies at 1200 ℃, in which ErFe_20_4 was stable along with the above two ternary compounds. Lattice constants of ErFeO_3 and Er_3Fe_50_12, prepared in air by a quenching method, were determined and compared with previous values, and showed slight differences. The Gibbs energy changes of the reactions in the Fe-0 system, Fe + 1/2 O_2 = FeO, 3 FeO + 1/2 0_2 = Fe_30_4, and 2/3 Fe_30_4 + 1/6 0_2 = Fe_20_3, were determined, and the obtained values were compared with the previous values. The Gibbs energy changes of the reactions, Fe + 1/2 Er_20_3 + 3/4 0_2 = ErFe0_3, and 3 ErFeO_3 + 2/3 Fe_3O_4 + 1/6 0_2 = Er_3Fe_50_12, were calculated from the oxygen partial pressures in equilibrium.
- 新潟工科大学の論文
- 2005-12-25