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An investigation of structural, magnetic and dielectric properties of R2NiMnO6 (R = rare earth, Y)

Booth, RJ and Fillman, R and Whitaker, H and Nag, Abanti and Tiwari, RM and Ramanujachary, KV and Gopalakrishnan, J and Lofland, SE (2009) An investigation of structural, magnetic and dielectric properties of R2NiMnO6 (R = rare earth, Y). In: Materials Research Bulletin, 44 (7). pp. 1559-1564.

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We have investigated the structure, magnetic and dielectric properties of the double perovskite oxides, R2NiMnO6 (R = Pr, Nd, Sm, Gd, Tb, Dy, Ho and Y). We could refine powder X-ray diffraction patterns of all the phases on the basis of monoclinic (P2(1)/n) double perovskite structure where Ni and Mn atoms are ordered at 2c and 2d sites, respectively. All the phases are ferromagnetic insulators exhibiting relatively low dielectric loss and dielectric constants in the range 15-25. The ferromagnetic ordering temperature of the R2NiMnO6 series seems to correlate better with the radius of R3+ atoms than with the average Ni-O-Mn angle (phi) in the double perovskite structure. These results are consistent with all samples having Mn4+ and Ni2+ With minimal antisite disorder.

Item Type: Journal Article
Publication: Materials Research Bulletin
Publisher: Elsevier Science
Additional Information: Copyright of this article belongs to Elsevier Science.
Keywords: Oxides; X-ray diffraction; Magnetic properties; Dielectric properties.
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited: 26 Aug 2009 18:37
Last Modified: 19 Sep 2010 05:36
URI: http://eprints.iisc.ac.in/id/eprint/21112

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