Chemical stability of SrCe0.95Yb0.05O 3-α in hydrogen atmosphere at elevated temperatures

Sachio Okada; Atsushi Mineshige; Akira Takasaki; Masafumi Kobune; Tetsuo Yazawa; Hiroshige Matsumoto; Tetsuo Shimura; Hiroyasu Iwahara; Zempachi Ogumi

doi:10.1016/j.ssi.2004.03.047

Chemical stability of SrCe_0.95Yb_0.05O _3-α in hydrogen atmosphere at elevated temperatures

Sachio Okada, Atsushi Mineshige, Akira Takasaki, Masafumi Kobune, Tetsuo Yazawa, Hiroshige Matsumoto, Tetsuo Shimura, Hiroyasu Iwahara, Zempachi Ogumi

Research output: Contribution to journal › Conference article › peer-review

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Abstract

The influence of water vapor pressure, P(H₂O), on chemical stability of SrCe_0.95Yb_0.05O_3-α under hydrogen atmosphere was investigated using XRD and Raman spectroscopy. From an XRD study, a second phase assigned to Sr₂CeO₄ was observed under strongly reducing conditions such as dry H₂ with P(H₂O)=4.6 × 10 Pa [ P(O₂)=3.1 × 10 ^-15 Pa] at 1273 K. From Raman spectroscopy, it was found that treated specimens under hydrogen atmosphere exhibited additional Raman bands, which may be assigned to the second phase. The relative intensity of the additional Raman band at 460 cm^-1 drastically increased with decreasing P(H₂O) in the region P(H ₂O)<7.0×10² Pa (2°C sat.), whereas it was quite low in the region P(H₂O)>7.0×10² Pa [P(O₂)>3.0×10^-14 Pa] at 1273 K. The perovskite phase proved to be stable against hydrogen with an increase in P(H₂O) or a decrease in temperature.

Original language	English
Pages (from-to)	593-596
Number of pages	4
Journal	Solid State Ionics
Volume	175
Issue number	1-4
DOIs	https://doi.org/10.1016/j.ssi.2004.03.047
Publication status	Published - Nov 30 2004
Externally published	Yes
Event	Fourteenth International Conference on Solid State Ionics - Monterey, CA., United States Duration: Jun 22 2003 → Jun 27 2003

All Science Journal Classification (ASJC) codes

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

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10.1016/j.ssi.2004.03.047

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title = "Chemical stability of SrCe0.95Yb0.05O 3-α in hydrogen atmosphere at elevated temperatures",

abstract = "The influence of water vapor pressure, P(H2O), on chemical stability of SrCe0.95Yb0.05O3-α under hydrogen atmosphere was investigated using XRD and Raman spectroscopy. From an XRD study, a second phase assigned to Sr2CeO4 was observed under strongly reducing conditions such as dry H2 with P(H2O)=4.6 × 10 Pa [ P(O2)=3.1 × 10 -15 Pa] at 1273 K. From Raman spectroscopy, it was found that treated specimens under hydrogen atmosphere exhibited additional Raman bands, which may be assigned to the second phase. The relative intensity of the additional Raman band at 460 cm-1 drastically increased with decreasing P(H2O) in the region P(H 2O)<7.0×102 Pa (2°C sat.), whereas it was quite low in the region P(H2O)>7.0×102 Pa [P(O2)>3.0×10-14 Pa] at 1273 K. The perovskite phase proved to be stable against hydrogen with an increase in P(H2O) or a decrease in temperature.",

author = "Sachio Okada and Atsushi Mineshige and Akira Takasaki and Masafumi Kobune and Tetsuo Yazawa and Hiroshige Matsumoto and Tetsuo Shimura and Hiroyasu Iwahara and Zempachi Ogumi",

note = "Funding Information: This work has been supported by CREST of JST (Japan Science and Technology Corporation).; Fourteenth International Conference on Solid State Ionics ; Conference date: 22-06-2003 Through 27-06-2003",

year = "2004",

month = nov,

day = "30",

doi = "10.1016/j.ssi.2004.03.047",

language = "English",

volume = "175",

pages = "593--596",

journal = "Solid State Ionics",

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TY - JOUR

T1 - Chemical stability of SrCe0.95Yb0.05O 3-α in hydrogen atmosphere at elevated temperatures

AU - Okada, Sachio

AU - Mineshige, Atsushi

AU - Takasaki, Akira

AU - Kobune, Masafumi

AU - Yazawa, Tetsuo

AU - Matsumoto, Hiroshige

AU - Shimura, Tetsuo

AU - Iwahara, Hiroyasu

AU - Ogumi, Zempachi

N1 - Funding Information: This work has been supported by CREST of JST (Japan Science and Technology Corporation).

PY - 2004/11/30

Y1 - 2004/11/30

N2 - The influence of water vapor pressure, P(H2O), on chemical stability of SrCe0.95Yb0.05O3-α under hydrogen atmosphere was investigated using XRD and Raman spectroscopy. From an XRD study, a second phase assigned to Sr2CeO4 was observed under strongly reducing conditions such as dry H2 with P(H2O)=4.6 × 10 Pa [ P(O2)=3.1 × 10 -15 Pa] at 1273 K. From Raman spectroscopy, it was found that treated specimens under hydrogen atmosphere exhibited additional Raman bands, which may be assigned to the second phase. The relative intensity of the additional Raman band at 460 cm-1 drastically increased with decreasing P(H2O) in the region P(H 2O)<7.0×102 Pa (2°C sat.), whereas it was quite low in the region P(H2O)>7.0×102 Pa [P(O2)>3.0×10-14 Pa] at 1273 K. The perovskite phase proved to be stable against hydrogen with an increase in P(H2O) or a decrease in temperature.

AB - The influence of water vapor pressure, P(H2O), on chemical stability of SrCe0.95Yb0.05O3-α under hydrogen atmosphere was investigated using XRD and Raman spectroscopy. From an XRD study, a second phase assigned to Sr2CeO4 was observed under strongly reducing conditions such as dry H2 with P(H2O)=4.6 × 10 Pa [ P(O2)=3.1 × 10 -15 Pa] at 1273 K. From Raman spectroscopy, it was found that treated specimens under hydrogen atmosphere exhibited additional Raman bands, which may be assigned to the second phase. The relative intensity of the additional Raman band at 460 cm-1 drastically increased with decreasing P(H2O) in the region P(H 2O)<7.0×102 Pa (2°C sat.), whereas it was quite low in the region P(H2O)>7.0×102 Pa [P(O2)>3.0×10-14 Pa] at 1273 K. The perovskite phase proved to be stable against hydrogen with an increase in P(H2O) or a decrease in temperature.

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U2 - 10.1016/j.ssi.2004.03.047

DO - 10.1016/j.ssi.2004.03.047

M3 - Conference article

AN - SCOPUS:10044228555

SN - 0167-2738

VL - 175

SP - 593

EP - 596

JO - Solid State Ionics

JF - Solid State Ionics

IS - 1-4

T2 - Fourteenth International Conference on Solid State Ionics

Y2 - 22 June 2003 through 27 June 2003

ER -

Chemical stability of SrCe_0.95Yb_0.05O _3-α in hydrogen atmosphere at elevated temperatures

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