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Synthesis of the perovskite-like layered 12R phase of BaCe0.25Mn0.75O3 (12R-BCM) at higher yields (> 97 wt%) than previously reported. The influence of sintering temperature and redox cycling on the composition and weight fraction of secondary phases is investigated. The anisotropy between thermal expansion along the c-axis and within the ab plane is examined with synchrotron-based diffraction measurements.
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Nearly complete conversion to a Ba3Nb0.75Mn2.25O9-6H structure was observed following thermochemical reduction of the parent Ba4NbMn3O12-12R material. The Ba3Nb0.75Mn2.25O9-6H structure represents a hexagonal perovskite that displays substitution of Mn onto Nb sites in order to satisfy the 3:1 Mn:Nb ratio within the 6H structural motif.