Magnetism and 3D Electron Diffraction Solution of Hydrated Rubidium-Ruthenium Oxide Rb$_2$Ru$_2$O$_7$.H$_2$O

The crystal structure of Rb $_{2}$ Ru $_{2}$ O $_{7}$ .H $_{2}$ O was determined by three-dimensional electron diffraction from the individual crystallites of a solid-state powder product. Rb $_{2}$ Ru $_{2}$ O $_{7}$ .H $_{2}$ O crystallizes in space group $C$ 2/ $c$ ( $a = 7.841 (3)$ Å, $b = 12.500 (3)$ Å, $c = 8.392 (2)$ Å, $β = 93.57 (4)^{\circ}$ , Z=4). The structure contains infinite chains that run normal to the (101) plane and consist of alternating RuO $_{6}$ octahedra and square-pyramidal RuO $_{5}$ 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 $M = 4.4 \times 10^{- 3} μ_{B} {R u}^{- 1}$ , 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.

Magnetism and 3D Electron Diffraction Solution of Hydrated Rubidium-Ruthenium Oxide Rb $_{2}$ Ru $_{2}$ O $_{7}$ .H $_{2}$ O

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Magnetism and 3D Electron Diffraction Solution of Hydrated Rubidium-Ruthenium Oxide Rb $_{2}$ Ru $_{2}$ O $_{7}$ .H $_{2}$ O

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Magnetism and 3D Electron Diffraction Solution of Hydrated Rubidium-Ruthenium Oxide Rb22​Ru22​O77​.H22​O

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Magnetism and 3D Electron Diffraction Solution of Hydrated Rubidium-Ruthenium Oxide Rb22​Ru22​O77​.H22​O

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Magnetism and 3D Electron Diffraction Solution of Hydrated Rubidium-Ruthenium Oxide Rb $_{2}$ Ru $_{2}$ O $_{7}$ .H $_{2}$ O

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Magnetism and 3D Electron Diffraction Solution of Hydrated Rubidium-Ruthenium Oxide Rb $_{2}$ Ru $_{2}$ O $_{7}$ .H $_{2}$ O

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