Charge ordering in transition metal oxides

J. Paul Attfield

doi:10.1016/j.solidstatesciences.2005.02.011

Charge ordering in transition metal oxides

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

Abstract / Description of output

Long range ordering of two transition metal charge (oxidation) states occurs in many oxides. Direct structural evidence from powder neutron diffraction studies on several half-doped manganites (Pr0.5Ca0.5MnO3, TbBaMn2O6, YBaMn2O6) and magnetite (Fe3O4) is reviewed. Charge ordering is accompanied by subtle distortions to low (monoclinic or triclinic) symmetry in all cases. The half-doped manganites reveal polymorphism of both charge and Mn3+ orbital ordered arrangements. The degree of charge separation estimated by bond valence sums for these and other oxides is only 20-80% of the ideal difference. The origin of this effect is not clear from present data. (c) 2006 Elsevier SAS. All rights reserved.

Original language	English
Pages (from-to)	861-867
Number of pages	7
Journal	Solid state sciences
Volume	8
Issue number	8
DOIs	https://doi.org/10.1016/j.solidstatesciences.2005.02.011
Publication status	Published - Aug 2006

Keywords / Materials (for Non-textual outputs)

LOW-TEMPERATURE STRUCTURE
VERWEY TRANSITION
ROOM-TEMPERATURE
MAGNETITE FE3O4
PHASE
DISPROPORTIONATION
DIFFRACTION
MANGANITES
SCATTERING
VALENCE

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10.1016/j.solidstatesciences.2005.02.011

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title = "Charge ordering in transition metal oxides",

abstract = "Long range ordering of two transition metal charge (oxidation) states occurs in many oxides. Direct structural evidence from powder neutron diffraction studies on several half-doped manganites (Pr0.5Ca0.5MnO3, TbBaMn2O6, YBaMn2O6) and magnetite (Fe3O4) is reviewed. Charge ordering is accompanied by subtle distortions to low (monoclinic or triclinic) symmetry in all cases. The half-doped manganites reveal polymorphism of both charge and Mn3+ orbital ordered arrangements. The degree of charge separation estimated by bond valence sums for these and other oxides is only 20-80% of the ideal difference. The origin of this effect is not clear from present data. (c) 2006 Elsevier SAS. All rights reserved.",

keywords = "LOW-TEMPERATURE STRUCTURE, VERWEY TRANSITION, ROOM-TEMPERATURE, MAGNETITE FE3O4, PHASE, DISPROPORTIONATION, DIFFRACTION, MANGANITES, SCATTERING, VALENCE",

author = "Attfield, {J. Paul}",

year = "2006",

month = aug,

doi = "10.1016/j.solidstatesciences.2005.02.011",

language = "English",

volume = "8",

pages = "861--867",

journal = "Solid state sciences",

issn = "1293-2558",

publisher = "Elsevier",

number = "8",

}

TY - JOUR

T1 - Charge ordering in transition metal oxides

AU - Attfield, J. Paul

PY - 2006/8

Y1 - 2006/8

N2 - Long range ordering of two transition metal charge (oxidation) states occurs in many oxides. Direct structural evidence from powder neutron diffraction studies on several half-doped manganites (Pr0.5Ca0.5MnO3, TbBaMn2O6, YBaMn2O6) and magnetite (Fe3O4) is reviewed. Charge ordering is accompanied by subtle distortions to low (monoclinic or triclinic) symmetry in all cases. The half-doped manganites reveal polymorphism of both charge and Mn3+ orbital ordered arrangements. The degree of charge separation estimated by bond valence sums for these and other oxides is only 20-80% of the ideal difference. The origin of this effect is not clear from present data. (c) 2006 Elsevier SAS. All rights reserved.

AB - Long range ordering of two transition metal charge (oxidation) states occurs in many oxides. Direct structural evidence from powder neutron diffraction studies on several half-doped manganites (Pr0.5Ca0.5MnO3, TbBaMn2O6, YBaMn2O6) and magnetite (Fe3O4) is reviewed. Charge ordering is accompanied by subtle distortions to low (monoclinic or triclinic) symmetry in all cases. The half-doped manganites reveal polymorphism of both charge and Mn3+ orbital ordered arrangements. The degree of charge separation estimated by bond valence sums for these and other oxides is only 20-80% of the ideal difference. The origin of this effect is not clear from present data. (c) 2006 Elsevier SAS. All rights reserved.

KW - LOW-TEMPERATURE STRUCTURE

KW - VERWEY TRANSITION

KW - ROOM-TEMPERATURE

KW - MAGNETITE FE3O4

KW - PHASE

KW - DISPROPORTIONATION

KW - DIFFRACTION

KW - MANGANITES

KW - SCATTERING

KW - VALENCE

U2 - 10.1016/j.solidstatesciences.2005.02.011

DO - 10.1016/j.solidstatesciences.2005.02.011

M3 - Article

SN - 1293-2558

VL - 8

SP - 861

EP - 867

JO - Solid state sciences

JF - Solid state sciences

IS - 8

ER -

Charge ordering in transition metal oxides

Abstract / Description of output

Keywords / Materials (for Non-textual outputs)

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