Enhancement of oxygen exchange at the hetero interface of (La,Sr)CoO3/(La,Sr)2CoO4 in composite ceramics

Maya Sase; Keiji Yashiro; Kazuhisa Sato; Junichiro Mizusaki; Tatsuya Kawada; Natsuko Sakai; Katsuhiko Yamaji; Teruhisa Horita; Harumi Yokokawa

doi:10.1016/j.ssi.2007.11.039

Enhancement of oxygen exchange at the hetero interface of (La,Sr)CoO₃/(La,Sr)₂CoO₄ in composite ceramics

Maya Sase, Keiji Yashiro, Kazuhisa Sato, Junichiro Mizusaki, Tatsuya Kawada, Natsuko Sakai, Katsuhiko Yamaji, Teruhisa Horita, Harumi Yokokawa

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

112 Citations (Scopus)

Abstract

The preferential reaction path for oxygen isotope exchange was investigated on a large-grained polycrystalline (La_0.6Sr_0.4)CoO₃ with (La,Sr)₂CoO₄ grains dispersed as the secondary phase. The isotope exchange experiment was performed at 773 K in ¹⁸O enriched oxygen of 0.2 × 10⁵ Pa. Three-dimensional imaging of Secondary Ion Mass Spectrometry (SIMS) was carried out to visualize the isotope distribution. The SIMS image suggested that there are fast oxygen-incorporation paths along the heterophase boundary of (La_0.6Sr_0.4)CoO₃ / (La,Sr)₂CoO₄. The surface exchange coefficient, k for the heterophase boundary was roughly estimated by analyzing the depth profile of ¹⁸O. The calculated k was 8 × 10^{- 6} cm s^{- U1}, which is larger than the value of k for the surface of single phase La_0.6Sr_0.4CoO₃ by three orders of magnitude.

Original language	English
Pages (from-to)	1843-1852
Number of pages	10
Journal	Solid State Ionics
Volume	178
Issue number	35-36
DOIs	https://doi.org/10.1016/j.ssi.2007.11.039
Publication status	Published - 2008 Feb 15

Keywords

(La,Sr)CoO
LaSrCoO
SIMS
SOFC cathode
oxygen isotope exchange

ASJC Scopus subject areas

Chemistry(all)
Materials Science(all)
Condensed Matter Physics

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Enhancement of oxygen exchange at the hetero interface of (La,Sr)CoO₃/(La,Sr)₂CoO₄ in composite ceramics. / Sase, Maya; Yashiro, Keiji ; Sato, Kazuhisa; Mizusaki, Junichiro; Kawada, Tatsuya; Sakai, Natsuko; Yamaji, Katsuhiko; Horita, Teruhisa; Yokokawa, Harumi.

In: Solid State Ionics, Vol. 178, No. 35-36, 15.02.2008, p. 1843-1852.

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

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title = "Enhancement of oxygen exchange at the hetero interface of (La,Sr)CoO3/(La,Sr)2CoO4 in composite ceramics",

abstract = "The preferential reaction path for oxygen isotope exchange was investigated on a large-grained polycrystalline (La0.6Sr0.4)CoO3 with (La,Sr)2CoO4 grains dispersed as the secondary phase. The isotope exchange experiment was performed at 773 K in 18O enriched oxygen of 0.2 × 105 Pa. Three-dimensional imaging of Secondary Ion Mass Spectrometry (SIMS) was carried out to visualize the isotope distribution. The SIMS image suggested that there are fast oxygen-incorporation paths along the heterophase boundary of (La0.6Sr0.4)CoO3 / (La,Sr)2CoO4. The surface exchange coefficient, k for the heterophase boundary was roughly estimated by analyzing the depth profile of 18O. The calculated k was 8 × 10- 6 cm s- U1, which is larger than the value of k for the surface of single phase La0.6Sr0.4CoO3 by three orders of magnitude.",

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author = "Maya Sase and Keiji Yashiro and Kazuhisa Sato and Junichiro Mizusaki and Tatsuya Kawada and Natsuko Sakai and Katsuhiko Yamaji and Teruhisa Horita and Harumi Yokokawa",

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AU - Mizusaki, Junichiro

AU - Kawada, Tatsuya

AU - Sakai, Natsuko

AU - Yamaji, Katsuhiko

AU - Horita, Teruhisa

AU - Yokokawa, Harumi

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N2 - The preferential reaction path for oxygen isotope exchange was investigated on a large-grained polycrystalline (La0.6Sr0.4)CoO3 with (La,Sr)2CoO4 grains dispersed as the secondary phase. The isotope exchange experiment was performed at 773 K in 18O enriched oxygen of 0.2 × 105 Pa. Three-dimensional imaging of Secondary Ion Mass Spectrometry (SIMS) was carried out to visualize the isotope distribution. The SIMS image suggested that there are fast oxygen-incorporation paths along the heterophase boundary of (La0.6Sr0.4)CoO3 / (La,Sr)2CoO4. The surface exchange coefficient, k for the heterophase boundary was roughly estimated by analyzing the depth profile of 18O. The calculated k was 8 × 10- 6 cm s- U1, which is larger than the value of k for the surface of single phase La0.6Sr0.4CoO3 by three orders of magnitude.

AB - The preferential reaction path for oxygen isotope exchange was investigated on a large-grained polycrystalline (La0.6Sr0.4)CoO3 with (La,Sr)2CoO4 grains dispersed as the secondary phase. The isotope exchange experiment was performed at 773 K in 18O enriched oxygen of 0.2 × 105 Pa. Three-dimensional imaging of Secondary Ion Mass Spectrometry (SIMS) was carried out to visualize the isotope distribution. The SIMS image suggested that there are fast oxygen-incorporation paths along the heterophase boundary of (La0.6Sr0.4)CoO3 / (La,Sr)2CoO4. The surface exchange coefficient, k for the heterophase boundary was roughly estimated by analyzing the depth profile of 18O. The calculated k was 8 × 10- 6 cm s- U1, which is larger than the value of k for the surface of single phase La0.6Sr0.4CoO3 by three orders of magnitude.

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