Abstract
Abstract Single crystals of Ba2LiOsO6 and Ba2NaOsO6 were grown from molten hydroxide fluxes. The oxides form in the double perovskite structure and contain heptavalent osmium. The structures crystallize in space group Fm 3 m with lattice parameters of 8.1046(2) A and 8.2870(3) A for the lithium and sodium containing compounds, respectively. Magnetic susceptibility measurements show evidence of antiferromagnetic correlations below 8 K for Ba2LiOsO6 and ferromagnetic-like ordering below 8 K for Ba2NaOsO6. The measured magnetic moment is unusually small for both materials, μeff=0.733 BM and μeff=0.677 BM for the lithium and sodium containing compounds, respectively.
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