Ramesha, K and Thangadurai, V and Sutar, D and Subramanyam, SV and Subbanna, GN and Gopalakrishnan, J (2000) $ALaMnBO_6$ (A = Ca, Sr, Ba; B = Fe, Ru)double perovskites. In: Materials Research Bulletin, 35 (4). pp. 559-565.
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Abstract
We report the synthesis and investigation of electrical and magnetic properties of double perovskites of the formula $ALaMnBO_6$ for A = Ca, Sr, Ba and B = Fe, Ru. Powder X-ray diffraction (XRD) shows formation of cubic/pseudocubic perovskite structure for all the phases, with no obvious long-range ordering of B-site cations. Electron diffraction, however, reveals an ordering of Mn and Ru in $ALaMnRuO_6$, showing a doubling of the primitive cubic perovskite cell. While the B = Fe phases are paramagnetic insulators, the B = Ru phases are ferrimagnetic semiconductors. It is likely that in the B = Ru phases, a valence equilibrium exists between $Mn^{III}/Ru^{IV}$ and $Mn^{II}/Ru^V$ states that is biased toward the latter.
Item Type: | Journal Article |
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Publication: | Materials Research Bulletin |
Publisher: | Elsevier |
Additional Information: | Copyright of this article belongs to Elsevier. |
Keywords: | A.Oxides;B.Chemical synthesis;C.X-ray diffraction;D.Electrical properties;D.Magnetic properties |
Department/Centre: | Division of Chemical Sciences > Solid State & Structural Chemistry Unit |
Date Deposited: | 05 Sep 2006 |
Last Modified: | 19 Sep 2010 04:30 |
URI: | http://eprints.iisc.ac.in/id/eprint/8124 |
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