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$Sr_4M_3ReO_{12}$ (M = Co, Fe): New Ferromagnetic Perovskite Oxides

Nag, Abanti and Manjanna, J and Tiwari, RM and Gopalakrishnan, J (2008) $Sr_4M_3ReO_{12}$ (M = Co, Fe): New Ferromagnetic Perovskite Oxides. In: Chemistry of Materials, 20 (13). pp. 4420-4424.

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We describe the synthesis, structure, and magnetic properties of two new perovskite oxides, $Sr_4M_3ReO_{12}$ (M =Co, Fe), that exhibit ferromagnetism with fairly high ordering temperatures $(T_c = \sim 250-300 K)$. While the M = Co phase crystallizes in a partially ordered double perovskite $(Pm\={3}m)$ structure (a = $7.8153 \AA$), the M = Fe phase adopts a primitive cubic perovskite $(Pm\={3}m)$ structure (a = $3.9353 \AA$), where the transition metal atoms are not ordered in the long range. Magnetization studies revealed bulk ferromagnetism for both oxides, but the disordered structures seem to preclude a long-range magnetic order and a definite $T_c$. While further studies are needed to establish the exact origin of magnetism of these materials, the present investigation reveals the possibility of designing new ferromagnetic oxides based on $M^{3+}-O-Re^{7+}$ (M =Co, Fe) magnetic interaction in the perovskite related structures.

Item Type: Journal Article
Publication: Chemistry of Materials
Publisher: American Chemical Society
Additional Information: Copyright of this article belongs to American Chemical Society.
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited: 04 Aug 2008
Last Modified: 19 Sep 2010 04:48
URI: http://eprints.iisc.ac.in/id/eprint/15440

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