Investigation of the role of morphology on the magnetic properties of Ca2Mn3O8 materials

Journal article


Vera-Stimpson, L., Ramos, S., Stenning, G., Jura, M. and Arnold, D. 2017. Investigation of the role of morphology on the magnetic properties of Ca2Mn3O8 materials. Dalton Transactions. 41. https://doi.org/10.1039/C7DT03053C
AuthorsVera-Stimpson, L., Ramos, S., Stenning, G., Jura, M. and Arnold, D.
Abstract

Ca2Mn3O8 exhibits a complex layered structure comprised of Mn3O84- layers separated by Ca2+ ions. In contrast with the more traditional triangular Delafossite layered materials the Mn3O84- layers additionally exhibit an ordered vacancy which forms a 'bow-tie' like arrangement of the Mn4+ ions. We report a comprehensive study of the magnetic properties of a series of Ca2Mn3O8 materials with different morphologies. EXAFS and XANES analysis confirm no differences in either manganese environment or oxidation state between materials. Apparent differences in magnetic order from SQUID magnetometry can be rationalised by uncompensated surface spins arising as a result of changes to the surface:volume ratio between morphologies. Furthermore, these data suggest these materials are potentially frustrated in nature, due to the triangular connectivity of Mn4+ spins with a simple ‘spin-up/spin-down’ (↑↓) antiferromagnetic model unable to explain the data collected.

Year2017
JournalDalton Transactions
Journal citation41
PublisherRoyal Society of Chemistry
ISSN1477-9226
Digital Object Identifier (DOI)https://doi.org/10.1039/C7DT03053C
Publication dates
Print25 Sep 2017
Publication process dates
Deposited27 Mar 2018
Accepted23 Sep 2017
Accepted author manuscript
Output statusPublished
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https://repository.canterbury.ac.uk/item/889xq/investigation-of-the-role-of-morphology-on-the-magnetic-properties-of-ca2mn3o8-materials

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