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Destabilization of cubic-stabilized zirconia electrolyte induced by boron oxide under reducing atmosphere

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Abstract

The stability of yttria-stabilized zirconia (YSZ) and scandia-stabilized zirconia (ScSZ) electrolytes against boron oxide was examined. Boron oxide was painted on the polished surface of YSZ and ScSZ and annealed at 1273 K for 100 h under wet hydrogen flowing condition. The X-ray diffractometry, scanning electron microscopy/energy dispersive X-ray analysis, and Raman studies revealed that formation of Y2O3 and Sc2O3 occurred on YSZ and ScSZ surfaces contacting the boron oxide, but rare earth borates were not observed. The surface of electrolytes around precipitated particles became rough and phase transformation was confirmed from the cubic to the tetragonal or the monoclinic phases due to stabilizer removal from cubic zirconia. It has been also verified that small amounts of zirconium and yttrium were transported from the electrolyte to the gas phase via boron component. This destabilization effect induced by boron oxide was more serious for ScSZ than for YSZ. A destabilization mechanism under wet hydrogen atmosphere is proposed based on pseudo ternary phase diagrams for the YO1.5–BO1.5–ZrO2 system and the ScO1.5–BO1.5–ZrO2 system and thermodynamic considerations.

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Acknowledgement

This study was supported by the New Energy and Industrial Technology Development Organization (NEDO) of Japan.

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Authors and Affiliations

  1. National Institute of Advanced Industrial Science and Technology (AIST), AIST Tsukuba Central No. 5, Higashi 1-1-1, Tsukuba, Ibaraki, 305-8565, Japan

    Haruo Kishimoto, Natsuko Sakai, Katsuhiko Yamaji, Teruhisa Horita, Yue-Ping Xiong, Manuel E. Brito & Harumi Yokokawa

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  1. Haruo Kishimoto
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  2. Natsuko Sakai
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  3. Katsuhiko Yamaji
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  4. Teruhisa Horita
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  5. Yue-Ping Xiong
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  6. Manuel E. Brito
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  7. Harumi Yokokawa
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Correspondence to Haruo Kishimoto.

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Kishimoto, H., Sakai, N., Yamaji, K. et al. Destabilization of cubic-stabilized zirconia electrolyte induced by boron oxide under reducing atmosphere. J Mater Sci 44, 639–646 (2009). https://doi.org/10.1007/s10853-008-3061-8

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  • DOI: https://doi.org/10.1007/s10853-008-3061-8

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