Abstract
A study of the crystallographic structure and magnetic properties of the double perovskites Ba 2MnMoO 6 and Sr 2MnMoO 6 in polycrystalline form has been carried out by means of neutron powder diffraction (NPD) and magnetization measurements. The Rietveld analysis of room temperature data shows that the Mn 2+ and Mo 6+ ions are B-site ordered, i.e. the structure is a NaCl-type ordered double perovskite. Ba 2MnMoO 6 crystallizes in the cubic space group Fm 3m ( a=8.1680(1)) and Sr 2MnMoO 6 crystallizes in the space group P4 2/ n ( a=7.9575(5), c=7.9583(9)). Bond valence sum (BVS) calculation revealed that these compounds have the valency pair of {Mn 2+(3d 5;t 3 2ge 2 g), Mo 6+(4d 0)}. The magnetic measurements suggest that these compounds transform to an antiferromagnetic state below 10 K.
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