A comprehensive variable temperature study of the layered oxide, Ca2Mn3O8

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

doi:10.1016/j.jallcom.2020.155633

A comprehensive variable temperature study of the layered oxide, Ca₂Mn₃O₈

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

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

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.

Original language	English
Article number	155633
Journal	Journal of Alloys and Compounds
Volume	843
Early online date	30 Jun 2020
DOIs	https://doi.org/10.1016/j.jallcom.2020.155633
Publication status	Published - 30 Nov 2020

Keywords

Layered oxides
Neutron diffraction
Electronic measurements

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10.1016/j.jallcom.2020.155633

Stimpson_2020_JAC_Ca2Mn3O8_AAM
Copyright © 2020 Elsevier B.V. All rights reserved. This work has been made available online in accordance with publisher policies or with permission. Permission for further reuse of this content should be sought from the publisher or the rights holder. This is the author created accepted manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.1016/j.jallcom.2020.155633
Accepted author manuscript, 1.09 MBLicence: CC BY-NC-ND

Cite this

@article{6d3ffb4014e34b6d9e9582f4ecf44dea,

title = "A comprehensive variable temperature study of the layered oxide, Ca2Mn3O8",

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 {\textquoteleft}bow-tie{\textquoteright} 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.",

keywords = "Layered oxides, Neutron diffraction, Electronic measurements",

author = "Laura Stimpson and McNulty, {Jason Allan} and Morrison, {Finlay D.} and Amit Mahjan and Emma McCabe and Alexandra Gibbs and Gavin Stenning and Marek Jura and Donna Arnold",

note = "The authors acknowledge the ISIS Neutron and Muon User Source for access to beamtime on HRPD (RB1520166 and RB1720182) [39,40]. We are also thankful for access to the instrumentation in the ISIS Materials Characterisation laboratory. We are grateful to Professor Mike Reece at Queen Mary University London for access to the spark plasma sintering (SPS) instrumentation and for assistance preparing pellets. LJV and JAM are grateful for the award of EPSRC DTA studentships.",

year = "2020",

month = nov,

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doi = "10.1016/j.jallcom.2020.155633",

language = "English",

volume = "843",

journal = "Journal of Alloys and Compounds",

issn = "0925-8388",

publisher = "Elsevier",

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T1 - A comprehensive variable temperature study of the layered oxide, Ca2Mn3O8

AU - Stimpson, Laura

AU - McNulty, Jason Allan

AU - Morrison, Finlay D.

AU - Mahjan, Amit

AU - McCabe, Emma

AU - Gibbs, Alexandra

AU - Stenning, Gavin

AU - Jura, Marek

AU - Arnold, Donna

N1 - The authors acknowledge the ISIS Neutron and Muon User Source for access to beamtime on HRPD (RB1520166 and RB1720182) [39,40]. We are also thankful for access to the instrumentation in the ISIS Materials Characterisation laboratory. We are grateful to Professor Mike Reece at Queen Mary University London for access to the spark plasma sintering (SPS) instrumentation and for assistance preparing pellets. LJV and JAM are grateful for the award of EPSRC DTA studentships.

PY - 2020/11/30

Y1 - 2020/11/30

N2 - 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.

AB - 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.

KW - Layered oxides

KW - Neutron diffraction

KW - Electronic measurements

U2 - 10.1016/j.jallcom.2020.155633

DO - 10.1016/j.jallcom.2020.155633

M3 - Article

SN - 0925-8388

VL - 843

JO - Journal of Alloys and Compounds

JF - Journal of Alloys and Compounds

M1 - 155633

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