Magnetism and 3D Electron Diffraction Solution of Hydrated Rubidium-Ruthenium Oxide Rb2Ru2O7.H2O
Abstract
The crystal structure of Rb2Ru2O7.H2O was determined by three-dimensional electron diffraction from the individual crystallites of a solid-state powder product. Rb2Ru2O7.H2O crystallizes in space group C2/c (a=7.841(3) , b=12.500(3) , c=8.392(2) , β=93.57(4), Z=4). The structure contains infinite chains that run normal to the (101) plane and consist of alternating RuO6 octahedra and square-pyramidal RuO5 units connected via shared O-O edges. Magnetic properties were measured on the bulk powder, showing a diamagnetic baseline from 300 to 60 K with a small Curie tail below 55 K. The magnetic moment, calculated from the 1.8 K isotherm, saturates at M=4.4×10-3\,μB\,Ru-1, much less than would be expected for S=1 ruthenium. Bond-valence-sum analysis indicates high-valent Ru, and the near-diamagnetic response is consistent with the edge-sharing Ru-Ru motif, where weak direct Ru-Ru overlap yields a local singlet.
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