The crystal, magnetic structures and physical properties of the double perovskite-type barium neodymium osmate Ba 2NdOsO 6 are investigated through powder X-ray and neutron diffraction, electrical conductivity, magnetic susceptibility, and specific heat measurements. The Rietveld analysis reveals that the Nd and Os ions are arranged with regularity over the six-coordinate B sites in a distorted perovskite ABO 3 framework. The monoclinic crystal structure described by space group P2 1/n (tilt system a -a -c) becomes more distorted with decreasing temperature from 300 K down to 2.5 K. This compound shows a long-range antiferromagnetic ordering of Os 5 below 65 K. An antiferromagnetic ordering of Nd 3 also occurs at lower temperatures (∼20 K). The magnetic structure is of Type I and the magnetic moments of Nd 3 and Os 5 ions are in the same direction in the ab-plane.
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