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ALaMnBO$_6$ (A=5 Ca, Sr, Ba; B =Fe, Ru) double perovskites

Ramesha, K and Thangadurai, V and Sutar, D and Subramanyam, SV and Subbanna, GN and Gopalakrishnan, J (2000) ALaMnBO$_6$ (A=5 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
Additional Information: Copy right belongs to Elsevier
Keywords: Oxides;Chemical synthesis;X-ray diffraction;Electrical properties;Magnetic properties
Department/Centre: Division of Chemical Sciences > Materials Research Centre
Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Division of Physical & Mathematical Sciences > Physics
Date Deposited: 03 Dec 2008 07:39
Last Modified: 19 Sep 2010 04:52
URI: http://eprints.iisc.ernet.in/id/eprint/16566

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