Abstract
The new compounds Ln2FeMoO7 (Ln = Y, Dy, Ho) have been synthesized by solid-state reaction in evacuated silica tubes. The crystal structure of Dy2FeMoO7 and Ho2FeMoO7 was determined ab initio by simulated annealing in the R space group. Transmission electron microscopy study of Y2FeMoO7 revealed an unusual lamellar microstructure, composed of blocks with the structure of different zirconolite polymorphs. The dominant form corresponds to the zirconolite-2M type structure (space group C2/c) with a partially ordered array of Fe and Mo ions. X-Ray near edge spectroscopy data are consistent with formally Fe3+ and Mo5+ oxidation states for all compounds. Magnetic and transport measurements are reported.
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