Enhancement of magnetic ordering temperature in iron substituted ytterbium manganate (YbMn1−xFexO3)

Samal, S. L. ; Magdaleno, T. ; Ramanujachary, K. V. ; Lofland, S. E. ; Ganguli, A. K. (2010) Enhancement of magnetic ordering temperature in iron substituted ytterbium manganate (YbMn1−xFexO3) Journal of Solid State Chemistry, 183 (3). pp. 643-648. ISSN 0022-4596

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Official URL: http://www.sciencedirect.com/science/article/pii/S...

Related URL: http://dx.doi.org/10.1016/j.jssc.2010.01.007


Oxides of the type YbMn1−xFexO3; x≤0.3 showing multiferroic behavior have been synthesized by the solid state route. These oxides crystallize in the hexagonal structure known for the parent YbMnO3 with the c/a ratio increasing with Fe substitution. The distortion of the MnO5 polyhedra (tbp) decreases and the Mn-O-Mn bonds in the a-b plane become shorter with Fe-substitution. Magnetic ordering is observed from the low temperature neutron diffraction study. The compounds were found to be antiferromagnetic and the ordering temperature TN increased from 82 K for pure YbMnO3 to 95 K for YbMn0.7Fe0.3O3. Variable temperature dielectric measurements (15-110 K) show an anomaly in the dielectric constant at temperatures close to the antiferromagnetic ordering temperature for all the compositions, showing a unique correlation between the magnetic and electric field. The increase in the ordering temperature in YbMn1−xFexO3 is explained on the basis of increase in covalence of Mn/Fe-O-Mn/Fe bonds (shorter) with iron substitution.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
Keywords:Multiferroics; Rietveld Studies; Hexagonal Manganites
ID Code:62003
Deposited On:16 Sep 2011 03:58
Last Modified:16 Sep 2011 03:58

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