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A comprehensive variable temperature study of the layered oxide, Ca2Mn3O8

Research output: Contribution to journalArticle

Open Access Status

  • Embargoed (until 8/06/21)

Author(s)

Laura Stimpson, Jason Allan McNulty, Finlay D. Morrison, Amit Mahjan, Emma McCabe, Alexandra Gibbs, Gavin Stenning, Marek Jura, Donna Arnold

School/Research organisations

Abstract

Ca2Mn3O8 forms a delafossite-related layered structure, which crystallises with monoclinic C2/m symmetry. Compared with the delafossite-structure, the MnO6 layers in Ca2Mn3O8 exhibit an ordered cation void which forms a magnetic ‘bow-tie’ like connectivity of Mn4+ ion layers separated by Ca2+ ions. In-situ variable temperature diffraction data demonstrates that the structure is robust up to a temperature of approximately 1173 K before the material decomposes into the perovskite, CaMnO3 and marokite, CaMn2O4 phases. Simultaneous thermal analysis suggests that a very small amount of water remains within the layers post synthesis. Impedance spectroscopy indicates that Ca2Mn3O8 is an electronic conductor in the range ∼400–700 K with an activation energy of 0.50 ± 0.01 eV.
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Details

Original languageEnglish
Article number155633
JournalJournal of Alloys and Compounds
Volume843
Early online date30 Jun 2020
DOIs
Publication statusE-pub ahead of print - 30 Jun 2020

    Research areas

  • Layered oxides, Neutron diffraction, Electronic measurements

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