THE PHASE-RELATIONS IN THE IN2O3-FE2ZNO4-ZNO SYSTEM AT 1350-DEGREES-C

The phase relations in the In2O3Fe2ZnO4ZnO system at 1350°C are determined by means of a classical quenching method. There are a series of homologous solid solutions, In1.28Fe0.72O3(ZnO)InFeO3(ZnO), In1.69Fe0.31O3(ZnO)2InFeO3(ZnO)2In0.85Fe1.15O3(ZnO)2, In2O3(ZnO)3InFeO3(ZnO)3In0.78Fe1.22O3(ZnO)3, In2O3(ZnO)4InFeO3(ZnO)4In0.62Fe1.38O3(ZnO)4, In2O3(ZnO)5InFeO3(ZnO)5In0.67Fe1.33O3(ZnO)5, In2O3(ZnO)6InFeO3(ZnO)6In0.60Fe1.40O3(ZnO)6, In2O3(ZnO)7InFeO3(ZnO)7In0.51Fe1.49O3(ZnO)7, In2O3(ZnO)8InFeO3(ZnO)8In1-xFe1+xO3(ZnO)8 (0.44 ≦ x ≦ 0.64), In2O3(ZnO)9InFeO3(ZnO)9In0.20Fe1.80O3(ZnO)9, In2O3(ZnO)10InFeO3(ZnO)10In1-xFe1+xO3(ZnO)10 (0.74 ≦ x ≦ 0.89), In2O3(ZnO)11InFeO3(ZnO)11In1-xFe1+xO3(ZnO)11 (0.60 ≦ x < 1.00), and In2O3(ZnO)13InFeO3(ZnO)13Fe2O3(ZnO)13 having the layered structures with space group R3m (m = odd) or P63 mmc (m = even) for m in the InFeO3(ZnO)m. We conclude that there are a series of homologous phases, (Fe2O3)(ZnO)m (m ≧ 12), in the binary ZnOFe2O3 system. The lattice constants for these solid solutions are presented as a hexagonal crystal system. It is also concluded that the crystal structures for each solid solution consist of three kinds of layers which are stacked perpendicular to the c-axis in the hexagonal crystal system. In1+xFe1-xO3(ZnO)m (0 ≦ x ≦ 1) is composed of the InO1.5, (InxFe1-xZn)O2.5, and ZnO layers, and In1-xFe1+xO3(ZnO)m (0 ≦ x ≦ 1) is composed of (In1-xFex)O1.5, (FeZn)O2.5, and ZnO layers, respectively. The solid solution range between Fe2ZnO4 and InxFe2-xZnO4 (x = 0.40 ± 0.02) with a spinel structure is observed. © 1990.