Abstract
The Rare-Earth ferrates REFeO 3 (RE = La, Pr, Sm, Gd, Ho) were prepared by the citric acid route. The distortion in the FeO 6 octahedron decreased with the decrease in the ionic radii (except for Ho) and the angle between adjacent FeO 6 octahedra decreased with the ionic radius of the rare earth. Electrical conductivity showed semiconducting behaviour with a complex dependence of the activation energy on the ionic radii of RE ion. Fast oxygen desorption was observed above 300 °C. No effect of A-site cation on the coefficients of thermal expansion was observed.
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