Thumbnail
Access Restriction
Open

Author Pinacca, R. M. ♦ Larrégola, S. A. ♦ López, C. A. ♦ Pedregosa, J. C. ♦ Pomjakushin, Vladimir ♦ Sánchez, R. D. ♦ Alonso, J. A.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword MATERIALS SCIENCE ♦ ANTIFERROMAGNETISM ♦ CRYSTALS ♦ ELECTRONIC STRUCTURE ♦ MAGNETIC MOMENTS ♦ MAGNETIC SUSCEPTIBILITY ♦ MAGNETIZATION ♦ MOLYBDENUM COMPOUNDS ♦ MONOCLINIC LATTICES ♦ NEUTRON DIFFRACTION ♦ OXYGEN COMPOUNDS ♦ PEROVSKITE ♦ RARE EARTH COMPOUNDS ♦ SOLIDS ♦ SPACE GROUPS ♦ STRONTIUM COMPOUNDS ♦ TEMPERATURE RANGE 0273-0400 K ♦ X-RAY DIFFRACTION
Abstract Highlights: • Five new double perovskites of formula Sr{sub 2}LnMoO{sub 6} were synthesized. • All the samples crystallize in the monoclinic P2{sub 1}/n space group. • Strong reducing conditions were used in order to stabilized Mo(V) cations. • A complete ordering between the rare earth and molybdenum ions was observed. • Magnetism agrees with the crystal distortions observed from Rietveld analysis. - Abstract: We describe the preparation, crystal structure determination and magnetic properties of a new series of ordered double perovskite oxides Sr{sub 2}LnMoO{sub 6} (Ln = Eu, Gd, Dy, Ho, Er, Yb) with Mo{sup 5+} and Ln{sup 3+} electronic configurations. These compounds have been obtained by solid state reaction under reducing conditions in order to stabilize Mo{sup 5+} cations. Structural characterization by XRPD and NPD was performed when Ln = Ho, Er, Yb and just XRPD for absorbing Ln = Eu, Gd, Dy. At room temperature, an excellent Rietveld fit was obtained for all the samples in a monoclinic symmetry, space group P2{sub 1}/n, with long-range ordering of Ln and Mo atoms. Magnetic susceptibility measurements show that some of these materials present magnetic ordering below 25 K and the determined effective magnetic moments are consistent with those expected for the pair Ln{sup 3+}–Mo{sup 5+}. All the phases have negative values​​ of the Weiss temperature indicating dominance of antiferromagnetic interactions.
ISSN 00255408
Educational Use Research
Learning Resource Type Article
Publisher Date 2015-06-15
Publisher Place United States
Journal Materials Research Bulletin
Volume Number 66


Open content in new tab

   Open content in new tab