Oxygen vacancy ordering phenomena in the mixed-conducting hexagonal perovskite Ba7y2Mn3Ti2O20

Xiaojun Kuang; Mathieu Allix; Richard M. Ibberson; John B. Claridge; Hongjun Niu; Matthew J. Rosseinsky

doi:10.1021/cm0626740

Oxygen vacancy ordering phenomena in the mixed-conducting hexagonal perovskite Ba₇y₂Mn₃Ti₂O₂₀

Xiaojun Kuang, Mathieu Allix, Richard M. Ibberson, John B. Claridge, Hongjun Niu, Matthew J. Rosseinsky

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36 Scopus citations

Abstract

A 21R-type mixed conducting oxygen-deficient hexagonal perovskite Ba ₇Y₂Mn₃Ti₂O₂₀ was synthesized and its structure characterized by variable temperature neutron powder diffraction. The structure is characterized by the presence of both BaO₂ and BaO₃ layers. In the oxygen-stoichiometric material, the vacancies are ordered in c′-BaO₂ layers. Extra oxygen is accommodated by intergrowth of the vacancy-ordered c′-BaO ₂ layers with cubic c-BaO_3-x layers (x ≅ 1), which have disordered 2/3 oxygen occupancy. This material displays mixed electronic and oxide ionic conduction at high temperature, and the role of the two distinct and partially occupied anion sites within the BaO₂ layers in permitting the oxygen mobility is discussed.

Original language	English
Pages (from-to)	2884-2893
Number of pages	10
Journal	Chemistry of Materials
Volume	19
Issue number	11
DOIs	https://doi.org/10.1021/cm0626740
State	Published - May 29 2007
Externally published	Yes

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title = "Oxygen vacancy ordering phenomena in the mixed-conducting hexagonal perovskite Ba7y2Mn3Ti2O20",

abstract = "A 21R-type mixed conducting oxygen-deficient hexagonal perovskite Ba 7Y2Mn3Ti2O20 was synthesized and its structure characterized by variable temperature neutron powder diffraction. The structure is characterized by the presence of both BaO2 and BaO3 layers. In the oxygen-stoichiometric material, the vacancies are ordered in c′-BaO2 layers. Extra oxygen is accommodated by intergrowth of the vacancy-ordered c′-BaO 2 layers with cubic c-BaO3-x layers (x ≅ 1), which have disordered 2/3 oxygen occupancy. This material displays mixed electronic and oxide ionic conduction at high temperature, and the role of the two distinct and partially occupied anion sites within the BaO2 layers in permitting the oxygen mobility is discussed.",

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T1 - Oxygen vacancy ordering phenomena in the mixed-conducting hexagonal perovskite Ba7y2Mn3Ti2O20

AU - Kuang, Xiaojun

AU - Allix, Mathieu

AU - Ibberson, Richard M.

AU - Claridge, John B.

AU - Niu, Hongjun

AU - Rosseinsky, Matthew J.

PY - 2007/5/29

Y1 - 2007/5/29

N2 - A 21R-type mixed conducting oxygen-deficient hexagonal perovskite Ba 7Y2Mn3Ti2O20 was synthesized and its structure characterized by variable temperature neutron powder diffraction. The structure is characterized by the presence of both BaO2 and BaO3 layers. In the oxygen-stoichiometric material, the vacancies are ordered in c′-BaO2 layers. Extra oxygen is accommodated by intergrowth of the vacancy-ordered c′-BaO 2 layers with cubic c-BaO3-x layers (x ≅ 1), which have disordered 2/3 oxygen occupancy. This material displays mixed electronic and oxide ionic conduction at high temperature, and the role of the two distinct and partially occupied anion sites within the BaO2 layers in permitting the oxygen mobility is discussed.

AB - A 21R-type mixed conducting oxygen-deficient hexagonal perovskite Ba 7Y2Mn3Ti2O20 was synthesized and its structure characterized by variable temperature neutron powder diffraction. The structure is characterized by the presence of both BaO2 and BaO3 layers. In the oxygen-stoichiometric material, the vacancies are ordered in c′-BaO2 layers. Extra oxygen is accommodated by intergrowth of the vacancy-ordered c′-BaO 2 layers with cubic c-BaO3-x layers (x ≅ 1), which have disordered 2/3 oxygen occupancy. This material displays mixed electronic and oxide ionic conduction at high temperature, and the role of the two distinct and partially occupied anion sites within the BaO2 layers in permitting the oxygen mobility is discussed.

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JO - Chemistry of Materials

JF - Chemistry of Materials

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Oxygen vacancy ordering phenomena in the mixed-conducting hexagonal perovskite Ba₇y₂Mn₃Ti₂O₂₀

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