Ruthenium(V) Oxides from Low‐Temperature Hydrothermal Synthesis |
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| Authors: | Craig I Hiley Dr Martin R Lees Dr Janet M Fisher Dr David Thompsett Dr Stefano Agrestini Dr Ronald I Smith Prof Richard I Walton |
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| Institution: | 1. Department of Chemistry, University of Warwick, Gibbet Hill Road, Coventry, CV4 7AL (UK);2. Department of Physics, University of Warwick, Gibbet Hill Road, Coventry, CV4 7AL (UK);3. Johnson Matthey Technology Centre, Sonning Common, Reading, RG4 9NH (UK);4. Max‐Planck Institut, CPfS, N?thnitzer Strasse 40, 01187 Dresden (Germany);5. ISIS Neutron and Muon Source, Rutherford Appleton Laboratory, Harwell Oxford, Didcot, OX11, 0QX (UK) |
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| Abstract: | Low‐temperature (200 °C) hydrothermal synthesis of the ruthenium oxides Ca1.5Ru2O7, SrRu2O6, and Ba2Ru3O9(OH) is reported. Ca1.5Ru2O7 is a defective pyrochlore containing RuV/VI; SrRu2O6 is a layered RuV oxide with a PbSb2O6 structure, whilst Ba2Ru3O9(OH) has a previously unreported structure type with orthorhombic symmetry solved from synchrotron X‐ray and neutron powder diffraction. SrRu2O6 exhibits unusually high‐temperature magnetic order, with antiferromagnetism persisting to at least 500 K, and refinement using room temperature neutron powder diffraction data provides the magnetic structure. All three ruthenates are metastable and readily collapse to mixtures of other oxides upon heating in air at temperatures around 300–500 °C, suggesting they would be difficult, if not impossible, to isolate under conventional high‐temperature solid‐state synthesis conditions. |
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| Keywords: | hydrothermal synthesis magnetic properties neutron diffraction ruthenium X‐ray absorption spectroscopy |
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