High-Pressure Synthesis and Crystal Structure of a New Strontium Ruthenium Oxide: Sr₂Ru₃O₁₀

Author： Renard C. Daviero-Minaud S. Abraham F.

ISSN： 0022-4596

Source： Journal of Solid State Chemistry, Vol.143, Iss.2, 1999-03, pp. : 266-272

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Abstract

The new ternary oxide Sr₂Ru₃O₁₀ has been prepared under hydrothermal conditions (480–650°C, 1800–2100 bars) and characterized by X-ray single crystal diffraction data. The structure was refined in C2/m space group with a=10.985(3) Å, b= 5.635(1) Å, c=6.452(6) Å, and β=105.3(4)°. The structure refinement converged to R=0.032 and R_w=0.042. The ruthenium atoms with a mean oxidation number of 5.33 occupy two sorts of octahedral sites. The first form infinite rutile-like chains parallel to the b axis, while the second link these chains together to form layers parallel to (100) plane. The average Ru-O bond distance in the two types of octahedra does not allow assignment of an integral oxidation number to individual Ru ions. The Sr²⁺ cations are located in the interlayer space ensuring the stacking cohesion. The Sr₂Ru₃O₁₀ structure can also be described by the stacking of SrO₅ layers. The same stoichiometry is encountered in the barium fluorides Ba₂M₃F₁₀ (M=Ni, Cu, or Zn) but the stacking sequence is based on BaF₃ and BaF₇ layers. Sr₂Ru₃O₁₀ is the first example of strontium ruthenium oxide with Ru/Sr ratio higher than one. The Sr/Ru ratio is allowed by the existence of SrO₅ layers, which creates 1.5 octahedral sites per SrO₅ layer.