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Phase diagram calculations of ZrO2-based ceramics with an emphasis on the reduction/oxidation equilibria of cerium ions in the ZrO2-YO1.5-CeO2-CeO1.5 system

  • Basic And Applied Research
  • Published:
Journal of Phase Equilibria

Abstract

Phase diagram calculations that were made previously for the ZrO2-MO m/2 (m = 2, 3, 4) systems and for the ZrO2-YO1.5-MO m/2 (M = transition metals) systems have been extended to the ZrO2-YO1.5-CeO2(-CeO1.5) system to make an attempt to explain (1) thermogravimetric (TG) results as a function of oxygen potential, (2) electronic conductivity as a function of oxygen potential, and (3) a miscibility gap observed in air. The interaction parameters for the CeO2-CeO1.5-YO1.5 system were obtained from the reported oxygen nonstoichiometry in CeO2−x and rate earth doped ceria, (Ce,RE)O2−δ . The interaction parameters for the ZrO2-CeO2 subsystem were obtained so as to reproduce the observed miscibility gap at 1273 K. Those thermodynamic properties can reproduce consistently the experimental behaviors of the electronic conductivity and the TG results in the (Zr1−x Ce x )0.8Y0.2O1.9 solid solutions; these indicate the enhancement of reduction of CeO2.

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Authors and Affiliations

  1. National Institute of Advanced Industrial Science and Technology, Tsukuba, 305-8565, Ibaraki, Japan

    Harumi Yokokawa, Natsuko Sakai, Teruhisa Horita, Katsuhiko Yamaji & Yueping Xiong

  2. Graduate School of Engineering, Tohoku University, 980-8579, Sendai, Japan

    Takanori Otake & Hiroo Yugami

  3. Research Institute of Scientific Measurements, Tohoku University, 980-8577, Sendai, Japan

    Tatsuya Kawada & Junichiro Mizusaki

Authors
  1. Harumi Yokokawa
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  2. Natsuko Sakai
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  3. Teruhisa Horita
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  4. Katsuhiko Yamaji
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  5. Yueping Xiong
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  6. Takanori Otake
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  7. Hiroo Yugami
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  8. Tatsuya Kawada
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  9. Junichiro Mizusaki
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Yokokawa, H., Sakai, N., Horita, T. et al. Phase diagram calculations of ZrO2-based ceramics with an emphasis on the reduction/oxidation equilibria of cerium ions in the ZrO2-YO1.5-CeO2-CeO1.5 system. JPE 22, 331–338 (2001). https://doi.org/10.1361/105497101770338842

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  • DOI: https://doi.org/10.1361/105497101770338842

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