Synthesis, crystal structure and characterization of new 12H hexagonal perovskite-related oxides Ba6M2Na2X2O17 (M=Ru, Nb, Ta, Sb; X=V, Cr, Mn, P, As) |
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Authors: | Eric Quarez |
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Affiliation: | Laboratoire de Cristallochimie et Physicochimie du Solide, UMR CNRS 8012, ENSCL, Université des Sciences et Technologies de Lille, B.P. 108, 59652 Villeneuve d’Ascq Cedex, France |
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Abstract: | The new Ba6Ru2Na2X2O17 (X=V, Mn) compounds have been prepared by electrosynthesis in molten NaOH and their crystal structures have been refined from single crystals X-ray diffraction, space group P63/mmc, Z=2, for X=V: , , R1=4.76%, for X=Mn : , , R1=3.48%. The crystal structure is a 12H-type perovskite with a (c′cchcc)2 stacking sequence of [BaO3]c, [BaO3]h and [BaO2]c′ layers. The tridimensional edifice is formed by blocks of Ru2O9 dimers that share corners with NaO6 octahedra. These blocks sandwich double sheets of X5+O4 tetrahedra. Several isotypic Ba6M5+2Na2X5+2O17 materials (X=V, Cr, Mn, P, As) and (M=Ru, Nb, Ta, Sb) have been prepared by solid state reaction and characterized by Rietveld analysis. The magnetic and electric properties have been investigated and show besides the Ru5+2O9 typical intradimer antiferromagnetic couplings, discrepancies of both χ and ρ versus T at 50 and 100 K for Ba6Ru2Na2X2O17 (X=V, As). In this work, a review of the identified Ru-hexagonal perovskite materials is also reported in order to overview the wide variety of possibilities in the field of new compounds synthesis. |
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Keywords: | Electrosynthesis Hexagonal Perovskite Ruthenium oxides Magnetic properties |
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