Crystal structure, oxidation state and magnetism of La1.2Sr2.4RuO7: a new member of the [A2O][AnBn−1O3n] series of hexagonal perovskites |
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Authors: | Stefan G Ebbinghaus |
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Institution: | Lehrstuhl für Festkörperchemie, Institut für Physik, Universität Augsburg, Universitätsstraße 1, D-86159 Augsburg, Germany |
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Abstract: | Single crystals of the new compound La1.2Sr2.4RuO7, an oxide related to the hexagonal perovskites, were grown from a BaCl2 flux. The structure was solved by single crystal X-ray diffraction. La1.2Sr2.4RuO7 crystallizes in the space group with a=5.760(1) Å and c=18.273(3) Å. It is one of the rare examples of oxides with isolated RuO6-octahedra. The structure consists of alternating layers of RuO6-octahedra and trigonal (La,Sr)O6-prisms. These prisms are capped by one additional oxygen ion, which occupies a distorted position within the (La,Sr)O6-layers. La1.2Sr2.4RuO7 is the second member of the general A2O]AnBn−1O3n] family of hexagonal perovskites with n=2 and the first ruthenate possessing this structure. XANES investigations, bond valence sum calculations and magnetic measurements show that ruthenium takes the oxidation state +5. Although the ruthenium ions have quite long distances, a medium strong antiferromagnetic interaction between these paramagnetic centers was observed. |
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Keywords: | Hexagonal perovskites Ruthenates Single crystal structure XANES Oxidation states Magnetic properties |
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