"Synthesis, structure, and magnetic properties of Sr2NiOsO6 and Ca2NiOsO6: two new osmium-containing double perovskites"
R. Macquart, S.-J. Kim, W.R. Gemmill, J.K. Stalick, Y. Lee, T. Vogt, H-C. zur Loye
Vol.44, No.26, pp.9676-9683, 2005.12
Two new double perovskite oxides, Ca2NiOsO6 and Sr2NiOsO6, have been prepared as polycrystalline powders by solid state synthesis. The two oxides were structurally characterized by variable-temperature powder neutron diffraction. Ca2NiOsO6 was found to adopt a monoclinic structure (P21/n), while Sr2NiOsO6 was found to be tetragonal (I4/m). Magnetic susceptibility measurements indicate that Ca2NiOsO6 orders in a canted antiferromagnetic state at about 175 K while Sr2NiOsO6 orders antiferromagnetically at about 50 K.