Temperature evolution of structure and magnetic properties in the perovskite Sr2MnSbO6
2009 (English)In: Materials research bulletin, ISSN 0025-5408, E-ISSN 1873-4227, Vol. 44, no 4, 822-830 p.Article in journal (Refereed) Published
The structural and magnetic properties of the perovskite Sr2MnSbO6 have been studied. Combining neutron and X-ray powder diffraction data, the temperature evolution of the structural parameters was investigated with the Rietveld method between 2 and 1000 K. The crystal structure is tetragonal (space group I4/m) within the temperature interval of 2–750 K and cubic (space group Fm-3m) above 750 K. Both octahedral B-site positions were found to be partially occupied by Mn and Sb, but with different Mn/Sb ratios. The magnetic susceptibilities showed irreversibility between field cooled and zero-field cooled (ZFC) conditions and spin glass like magnetic dynamics including aging and memory phenomena at temperatures below 30 K; all appearing well above a broad maximum at 13 K in the ZFC susceptibility curves. This suggests that the material reaches an unconventional spin-glass state at low temperatures, possibly arising from a competitive situation between the double exchange (ferromagnetism) and the super-exchange (antiferromagnetism). Neutron diffraction patterns showed no evidence of a long-range magnetic ordering at 2 K which is consistent with spin glass behavior. The factors governing the observed structural and magnetic properties of Sr2MnSbO6 are discussed and compared with those of other quaternary Mn- and Sb-containing perovskites. Graphs of the temperature of magnetic phase transitions as functions of the cation size were constructed and are discussed for the AB3+1/2B5+1/2O3 series with isomorphous substitution of B3+ and B5+ cations. Possible influence of the A-cation sublattice on magnetic properties is also shortly considered.
Place, publisher, year, edition, pages
Elsevier Ltd , 2009. Vol. 44, no 4, 822-830 p.
Neutron scattering, Crystal structure, Ferroelectricity, Magnetic properties, Phase transitions
Chemical Sciences Engineering and Technology
Research subject Inorganic Chemistry
IdentifiersURN: urn:nbn:se:uu:diva-121029DOI: 10.1016/j.materresbull.2008.09.017ISI: 000264421200021OAI: oai:DiVA.org:uu-121029DiVA: diva2:304410