A comprehensive variable temperature study of the layered oxide Ca2Mn3O8

Laura Vera-Stimpson; J.A. McNulty; F.D. Morrison; A. Mahajan; E.E. McCabe; A.S. Gibbs; G.B.G. Stenning; M. Jura; D.C. Arnold

doi:10.1016/j.jallcom.2020.155633

A comprehensive variable temperature study of the layered oxide Ca2Mn3O8

Laura Vera-Stimpson
, J.A. McNulty
, F.D. Morrison
, A. Mahajan
, E.E. McCabe
, A.S. Gibbs
, G.B.G. Stenning
, M. Jura
, D.C. Arnold

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
Journal	Journal of Alloys and Compounds
DOIs	https://doi.org/10.1016/j.jallcom.2020.155633
Publication status	Published - 8 Jun 2020

Keywords

Ca2Mn3O8
Electronic measurements
Layered oxides
Neutron diffraction

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@article{432532f69f2043b8bbb06167a05d486b,

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 \textasciitilde{}400 – 700 K with an activation energy of 0.50±0.01 eV.",

keywords = "Ca2Mn3O8, Electronic measurements, Layered oxides, Neutron diffraction",

author = "Laura Vera-Stimpson and J.A. McNulty and F.D. Morrison and A. Mahajan and E.E. McCabe and A.S. Gibbs and G.B.G. Stenning and M. Jura and D.C. Arnold",

year = "2020",

month = jun,

day = "8",

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

language = "English",

journal = "Journal of Alloys and Compounds",

issn = "0925-8388",

publisher = "Elsevier B.V.",

}

TY - JOUR

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

AU - Vera-Stimpson, Laura

AU - McNulty, J.A.

AU - Morrison, F.D.

AU - Mahajan, A.

AU - McCabe, E.E.

AU - Gibbs, A.S.

AU - Stenning, G.B.G.

AU - Jura, M.

AU - Arnold, D.C.

PY - 2020/6/8

Y1 - 2020/6/8

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 - Ca2Mn3O8

KW - Electronic measurements

KW - Layered oxides

KW - Neutron diffraction

U2 - 10.1016/j.jallcom.2020.155633

DO - 10.1016/j.jallcom.2020.155633

M3 - Article

SN - 0925-8388

JO - Journal of Alloys and Compounds

JF - Journal of Alloys and Compounds

ER -

A comprehensive variable temperature study of the layered oxide Ca2Mn3O8

Abstract

Keywords

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