Thermodynamic Study on the Zinc-Iron-Oxygen System at 1200 K

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  • Itoh Satoshi
    Department of Metallurgy, Faculty of Engineering, Tohoku University
  • Azakami Takeshi
    Department of Metallurgy, Faculty of Engineering, Tohoku University

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The Zn–Fe–O system can be divided into three regions from the thermodynamic and metallurgical viewpoints: (i) Fe–Zn–ZnO–FeO system, (ii) FeO–ZnO–ZnFe2O4–Fe3O4 system and (iii) Fe3O4–ZnFe2O4–Fe2O3 system. Phase relations in each system have been studied at 1200 K by equilibrating synthetic samples in evacuated sealed quartz tubes. The results indicate that the phase relations at 1200 K are almost the same as that at 1100 K, while the mutual solid solubilities at 1200 K between ZnO and FeO are slightly larger than those at 1100 K. On the basis of the results and our previous EMF data using a stabilized zirconium oxide solid electrolyte, the equilibrium partial pressures of oxygen, −logpO<SUB>2</SUB>(=−log(PO<SUB>2</SUB>⁄P\ominus)), at 1200 K were thus estimated as follows: 20–16 for region (i), 14–12 for region (ii) and 6–3 for region (iii), respectively.<BR>The activities of the components in Fe–Zn, FeO–ZnO and Fe3O4–ZnFe2O4 systems were then obtained by applying the Gibbs-Duhem relation in each region.

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