New route to ordered double perovskites: synthesis of rock salt oxides, Li4MWO6, and their transformation to Sr2MWO6 (M= Mg, Mn, Fe, Ni) via metathesis

Mandal, Tapas Kumar ; Gopalakrishnan, J. (2005) New route to ordered double perovskites: synthesis of rock salt oxides, Li4MWO6, and their transformation to Sr2MWO6 (M= Mg, Mn, Fe, Ni) via metathesis Chemistry of Materials, 17 (9). pp. 2310-2316. ISSN 0897-4756

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Official URL: http://pubs.acs.org/doi/abs/10.1021/cm050064e

Related URL: http://dx.doi.org/10.1021/cm050064e

Abstract

We describe a solid-state metathesis route for the synthesis of double perovskite oxides, Sr2MWO6 (M = Mg, Mn, Fe, Ni), that enabled us to obtain cation-ordered phases at a considerably lower temperature ( ~750°C) than what is employed in conventional synthesis of these materials. The method involves reaction of appropriate rock salt related precursor oxides of the formula Li4MWO6 with anhydrous SrCl2 in the solid state at 750°C for 1-2 days. For this purpose, rock salt precursor oxides were designed and synthesized for the first time. Cation ordering in the Sr2MWO6 products obtained was investigated by Rietveld refinement of powder X-ray diffraction data. We believe that the strategy described here is general and could be extended for the synthesis of functional double perovskites at relatively mild conditions.

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ID Code:12879
Deposited On:11 Nov 2010 08:33
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