Oxygen ordering and mobility in YBaCo4O7+δ

Y. Jia; Hua Jiang; Mika Valkeapää; H. Yamauchi; Mikko Karppinen; Esko I. Kauppinen

doi:10.1021/ja809745k

Oxygen ordering and mobility in YBaCo₄O_7+δ

Y. Jia, Hua Jiang (Corresponding Author), Mika Valkeapää, H. Yamauchi, Mikko Karppinen, Esko I. Kauppinen

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

39 Citations (Scopus)

Abstract

Extraordinary oxygen ordering and mobility have been found in an oxygen-nonstoichiometric mixed-valence cobalt oxide, YBaCo₄O_8.5. The excess oxygen atoms appear to be incorporated in an orderly way into the YBaCo₄O₇ parent lattice with different configurations as the oxygen content varies. Intense electron-beam irradiation was used to observe recurrent oxygen migration in the lattice, causing reversible structural modulation transitions. The oxygen migration can be attributed mainly to the electron-beam heating effect. This study highlights the high degree of freedom of surplus oxygen within the investigated structure and advances our understanding of the oxygen diffusion process in related transition-metal oxide systems.

Original language	English
Pages (from-to)	4880-4883
Number of pages	4
Journal	Journal of the American Chemical Society
Volume	131
Issue number	13
DOIs	https://doi.org/10.1021/ja809745k
Publication status	Published - 2009
MoE publication type	A1 Journal article-refereed

Keywords

oxygen
oxygen ordering
oxygen mobility
cobalt oxide
oxygen diffusion
transition metal alloys
transition metals

Access to Document

10.1021/ja809745k

Cite this

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title = "Oxygen ordering and mobility in YBaCo4O7+δ",

abstract = "Extraordinary oxygen ordering and mobility have been found in an oxygen-nonstoichiometric mixed-valence cobalt oxide, YBaCo4O8.5. The excess oxygen atoms appear to be incorporated in an orderly way into the YBaCo4O7 parent lattice with different configurations as the oxygen content varies. Intense electron-beam irradiation was used to observe recurrent oxygen migration in the lattice, causing reversible structural modulation transitions. The oxygen migration can be attributed mainly to the electron-beam heating effect. This study highlights the high degree of freedom of surplus oxygen within the investigated structure and advances our understanding of the oxygen diffusion process in related transition-metal oxide systems.",

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T1 - Oxygen ordering and mobility in YBaCo4O7+δ

AU - Jia, Y.

AU - Jiang, Hua

AU - Valkeapää, Mika

AU - Yamauchi, H.

AU - Karppinen, Mikko

AU - Kauppinen, Esko I.

PY - 2009

Y1 - 2009

N2 - Extraordinary oxygen ordering and mobility have been found in an oxygen-nonstoichiometric mixed-valence cobalt oxide, YBaCo4O8.5. The excess oxygen atoms appear to be incorporated in an orderly way into the YBaCo4O7 parent lattice with different configurations as the oxygen content varies. Intense electron-beam irradiation was used to observe recurrent oxygen migration in the lattice, causing reversible structural modulation transitions. The oxygen migration can be attributed mainly to the electron-beam heating effect. This study highlights the high degree of freedom of surplus oxygen within the investigated structure and advances our understanding of the oxygen diffusion process in related transition-metal oxide systems.

AB - Extraordinary oxygen ordering and mobility have been found in an oxygen-nonstoichiometric mixed-valence cobalt oxide, YBaCo4O8.5. The excess oxygen atoms appear to be incorporated in an orderly way into the YBaCo4O7 parent lattice with different configurations as the oxygen content varies. Intense electron-beam irradiation was used to observe recurrent oxygen migration in the lattice, causing reversible structural modulation transitions. The oxygen migration can be attributed mainly to the electron-beam heating effect. This study highlights the high degree of freedom of surplus oxygen within the investigated structure and advances our understanding of the oxygen diffusion process in related transition-metal oxide systems.

KW - oxygen

KW - oxygen ordering

KW - oxygen mobility

KW - cobalt oxide

KW - oxygen diffusion

KW - transition metal alloys

KW - transition metals

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