Disproportionation of Rh(II) in Reduced Perovskite Oxides.
We propose to measure high-resolution neutron powder diffraction data from LaMn0.5Rh0.5O2.25, LaCo0.5Rh0.5O2.25 and LaNi0.5Rh0.5O2.25 at room temperature and 5 K to establish their crystal and magnetic structures. These phases are prepared by topochemical reduction from the corresponding LaM0.5Rh0.5O3 perovskite oxides. Their compositions suggest oxidation state combinations M(I), Rh(II). However, a previous study of an analogous Ruddlesden-Popper phase, LaSrCoŽ0.5Rh0.5O3.25, revealed that the rhodium cations had ‘disproportionated’ to a 1:1 mixture of Rh(I), Rh(III) driven by the presence of both square-planar and square-based pyramidal coordination sites for Rh. Our main motivation for studying these new LaM0.5Rh0.5O2.25 phases is to see if a similar Rh disproportionation occurs in the LaM0.5Rh0.5O2.25 phases. Magnetisation data collected from the LaM0.5Rh0.5O2.25 phases indicates these phases adopt magnetically ordered states at low temperature. So we wish to also measure data sets at low temperature to establish the magnetic structures of the phases and their ordering temperatures.
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Michael A Hayward; Claire V. Colin; NASSIF Vivian; PUENTE ORENCH Ines; SUARD Emmanuelle and XU Zheying. (2021). Disproportionation of Rh(II) in Reduced Perovskite Oxides.. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-23-761
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