Abstract
The double perovskites, Sr 2FeReO 6 and Sr 2FeRe 0.9 M 0.1O 6 ( M=Nb, Ta) have been obtained by soft synthesis methods which yield homogeneous particles of micrometric grain size. The materials have been studied by X-ray and neutron powder diffraction, scanning electron microscopy and magnetic measurements. Rietveld refinements show that the compounds adopt a tetragonal I4/ mmm structure at high temperatures and monoclinic P2 1/ n below the transition temperature. The magnetic structures were determined by neutron powder diffraction at 100 and 300 K for the Sr 2FeReO 6, Sr 2FeRe 0.9Nb 0.1O 6 and Sr 2FeRe 0.9Ta 0.1O 6 phases, respectively. Evidence for a ferrimagnetic coupling between the Fe 3+ and Re 5+ sublattices has been observed. Magnetic measurements yield magnetic moments lower than the theoretical ones being in accord with the antisite disorder of 25% in the B– B′ positions.
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