Abstract
| - The new series of iron oxides Ca1−xYxFe4O7, with the mixed valence Fe(II)−Fe(III) and a tetrahedral coordination of iron is isotypic to YBaCo4O7. Their structure is also closely related to that of Fe3O4. Like the latter, they are ferrimagnetic, with a TC up to 270 K, suggesting a complex magnetic structure.
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