Orthorhombic In(Fe_1-xTi_x)O_3+x/2 (0.50≤×≤0.69) and monoclinic In(Fe_1-xTi_x)O_3+x/2 (0.73≤×≤0.75) in the system InFeO₃-In₂Ti₂O₇ at 1300°C in air. II. Synthesis and crystal structures

Two solid solutions, In(Fe_1-xTi_x)O_3+x/2 (orthorhombic phase, Cmcm, 0.50≤×≤0.69) and In(Fe_1-xTi_x)O_3+x/2 (monoclinic phase, C2/m, 0.73≤×≤0.75) in the pseudobinary system InFeO₃-In₂Ti₂O₇ were synthesized at 1300°C in air. Their crystal structures which were determined by powder X-ray diffractometry were closely related to those of the delafossite, (hex.)InFeO₃ and the pyrochlore. The crystal structural relationships between InFeO₃, In(Fe_1-xTi_x)O_3+x/2, and the pyrochlore were discussed in terms of the stacking of the two-dimensional closest packed oxygen layers. The isostructural solid solutions, In(Al_1-xTi_x)O_3+x/2, In(Cr_1-xTi_x)O_3+x/2, In(Ga_1-xTi_x)O_3+x/2, In(Fe_1/3Ti_1/2Mg_1/6)O_19/6, and In(Ga_0.30Ti_0.45Mg_0.25)O_3.10 were also synthesized and their lattice constants were determined.