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

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)156-162
Number of pages7
JournalSolid State Ionics
Volume301
DOIs
Publication statusPublished - Mar 1 2017

All Science Journal Classification (ASJC) codes

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

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