In situ high-temperature X-ray and neutron diffraction of Cu–Mn oxide phases
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Copper–manganese oxides were analyzed by in situ high-temperature powder neutron and X-ray diffraction to investigate their crystal structure. Cu–Mn spinel was found to form a continuous solid solution with cubic symmetry between Mn3O4 and Cu2MnO4. A high-temperature phase with approximate composition Cu5Mn4O9 was shown to have hexagonal symmetry. The cation distribution and lattice parameters of Cu–Mn spinel were resolved through Rietveld refinement of in situ neutron diffraction data. The results demonstrated that the Cu ion has a lower octahedral site preference than manganese ions, and quenching is not a reliable method to determine the equilibrium structure in the system.
KeywordsNeutron Diffraction Octahedral Site CoFe2O4 Rietveld Refinement Tetrahedral Site
We wish to thank the Natural Sciences and Engineering Research Council of Canada for financial support. The authors also acknowledge I. David Brown, James Britten, Shahab Derakhshan, and Wenhe Gong for their assistance in this study.
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