Abstract
A new nickel(II) oxide, Sr 3Sb 2NiO 9, has been synthesised at 1200 °C. Rietveld fits to the powder synchrotron X-ray diffraction pattern show that this compound has orthorhombic symmetry [ a = 5.6237(1), b = 5.6442(1), c = 7.9574(1) A ̊ at 300 K ] and adopts a pseudo-double perovskite structure with Sb:Ni ratios of 40:60 and 93:7 at alternate cation sites. Powder neutron refinements demonstrate that space group symmetry is Pnnm between 1.5 and 300 K due to partly disordered rotations of the Sb/NiO 6 octahedra. Sr 3Sb 2NiO 9 behaves as a Curie-Weiss paramagnet at high temperatures with μ eff = 3.25(1) BM per Ni 2+ ion and ⊖ = − 119(1) K reflecting dominant antiferromagnetic spin-spin interactions, but a weak ferromagnetic component observed below the ordering temperature of 20 K suggests overall ferrimagnetic behaviour.
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