Topochemically reduced ruthenium double perovskites
Topochemical reduction of the ruthenium containing double perovskite phases LaSrNiRuO6, LaSrCoRuO6 and SrCo0.5Ru0.5O3 yields phases of composition LaSrNiRuO4, LaSrCoRuO4 and SrCo0.5Ru0.5O2 respectively. X-ray powder diffraction data indicate that the first two reduced phases adopt cation-ordered infinite-layer structures, while SrCo0.5Ru0.5O2 has an infinite-layer structure with Co/Ru disorder. We propose to collect room temperature neutron powder diffraction data to accurately determine the structures of these phases, with a particular emphasis on the oxide anion framework. Magnetization data indicate that LaSrNiRuO4 undergoes a transition at 250K to a state with a spontaneous magnetization, although it is unclear if this arises from ferrimagnetic or ferromagnetic couplings between nickel and ruthenium centers. We propose to collect low temperature neutron diffraction data in an applied magnetic field to resolve this issue. Magnetization data from LaSrCoRuO4 and SrCo0.5Ru0.5O2 suggest antiferromagnetically ordered states are adopted at low temperature. We propose to collect low-temperature data sets to determine the magnetically ordered structures of these materials.
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Michael A Hayward; Midori Amano Patino; SUARD Emmanuelle and ZHANG Ronghuan. (2015). Topochemically reduced ruthenium double perovskites. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-31-2372
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