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Ruthenium(V) Oxides from Low-Temperature Hydrothermal Synthesis

DOI: 10.1002/anie.201310110 DOI Help
PMID: 24644102 PMID Help

Authors: Craig Hiley (Department of Chemistry, University of Warwick, U.K.) , Martin Lees (Department of Chemistry, University of Warwick, U.K) , Janet M. Fisher (Johnson Matthey Technology Centre, U.K.) , David Thompsett (Johnson Matthey Technology Centre, U.K.) , Stefano Agrestini (CNRS ENSICAEN, Germany) , Ronald I. Smith (ISIS Neutron and Muon Source, U.K.) , Richard Walton (Department of Chemistry, University of Warwick, U.K)
Co-authored by industrial partner: Yes

Type: Journal Paper
Journal: Angewandte Chemie International Edition , VOL 53 (17) , PAGES 4423 - 4427

State: Published (Approved)
Published: April 2014
Diamond Proposal Number(s): 7253

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.

Subject Areas: Chemistry, Materials


Instruments: B18-Core EXAFS , I11-High Resolution Powder Diffraction