Orthorhombic In(Fe1-xTix)O3+x/2 (0.50 <= x <= 0.69) and monoclinic In(Fe1-xTix)O3+x/2 (0.73 <= x <= 0.75) in the system InFeO3-In2Ti2O7 at 1300 degrees C in air II. Synthesis and crystal structures

摘要

Two solid solutions, In(Fe1-xTix)O3+x/2 (orthorhombic phase, Cmcm, 0.50 less than or equal to x less than or equal to 0.69) and In(Fe1-xTix)O3+x/2 (monoclinic phase, C2/m, 0.73 less than or equal to x less than or equal to 0.75) in the pseudobinary system InFeO3-In2Ti2O7 were synthesized at 1300 degreesC 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(Fe1-xTix)O3+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(Al1-xTix)O3+x/2, In(Cr1-xTix)O3+x/2, In(Ga1-xTix)O3+x/2, In(Fe1/3Ti1/2Mg1/6)O-19/6, and In(Ga0.30Ti0.45Mg0.25)O-3.10 were also synthesized and their lattice constants were determined. (C) 2001 Academic Press. [References: 19]