Evaluation of isotope diffusion coefficient and surface exchange coefficient of ScSZ series oxide by oxygen isotope exchange method

Takaaki Sakai, Junji Hyodo, Masako Ogushi, Atsushi Inoishi, Shintaro Ida, Tatsumi Ishihara

研究成果: ジャーナルへの寄稿記事

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In this work, the Isotope diffusion coefficient (D*) and surface exchange coefficient (k*) of Sc2O3 stabilized ZrO2 (ScSZ) series oxide, 6 mol% Sc2O3-ZrO2 (6ScSZ), 10 mol% Sc2O3-ZrO2 (10ScSZ) and 10 mol% Sc2O3- 1 mol% CeO2-ZrO2 (10Sc1CeSZ) were evaluated by using oxygen isotope exchange method. It was found that these ScSZ oxides showed a relatively higher D* value; 10Sc1CeSZ showed 1.1 × 10− 7 cm2 s− 1, 10ScSZ showed 9.3 × 10− 8 cm2 s− 1 and 6ScSZ showed 6.1 × 10− 8 cm2 s− 1 at 711 °C, respectively. In addition, its activation energy was 1.0 eV for 10Sc1CeSZ, 1.1 eV for 10ScSZ and 1.0 eV for 6ScSZ, respectively. The rapid change of D* due to the phase transition was also confirmed at around 600 °C in the case of 10ScSZ. The surface exchange coefficient (k*) of these ScSZ oxides showed a relatively high value at lower temperature. 10Sc1CeSZ showed 1.3 × 10− 8 cm s− 1 at 498 °C under lower vapor pressure of less than 20 Pa.

元の言語英語
ページ(範囲)156-162
ページ数7
ジャーナルSolid State Ionics
301
DOI
出版物ステータス出版済み - 3 1 2017

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All Science Journal Classification (ASJC) codes

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

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