TY - JOUR
T1 - Thermodynamic study on the zinc-iron-oxygen system at 1200 K
AU - Itoh, Satoshi
AU - Azakami, Takeshi
N1 - Copyright:
Copyright 2017 Elsevier B.V., All rights reserved.
PY - 1995
Y1 - 1995
N2 - 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, -log pO(2) (= -log (PO(2)/Pθq)), 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. 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.
AB - 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, -log pO(2) (= -log (PO(2)/Pθq)), 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. 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.
UR - http://www.scopus.com/inward/record.url?scp=0029350814&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0029350814&partnerID=8YFLogxK
U2 - 10.2320/matertrans1989.36.1074
DO - 10.2320/matertrans1989.36.1074
M3 - Article
AN - SCOPUS:0029350814
VL - 36
SP - 1074
EP - 1080
JO - Materials Transactions
JF - Materials Transactions
SN - 1345-9678
IS - 8
ER -