Chemical and structural effects on ionic conductivity at columnar grain boundaries in yttria-stabilized zirconia thin films

Takanori Kiguchi, Yumiko Kodama, Toyohiko J. Konno, Hiroshi Funakubo, Osamu Sakurai, Kazuo Shinozaki

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

This study elucidated the effects of coherence and chemical composition on ionic conductivity at columnar grain boundaries of 6 mol% Y2O 3 doped ZrO2 (YSZ) thin films. The YSZ thin films were deposited with several orientation textures on MgO (100), Al2O 3 (102), and SiO2-glass substrates using metalorganic chemical vapor deposition (MOCVD). Impedance measurements revealed the total ionic conductivity of the thin films. The activation energy of the ionic conduction of YSZ thin films on MgO or Al2O3 substrates was 90120 kJ/mol. These films showed similar dependence that simply increased along with decreasing coherency at the columnar grain boundaries. However, that of YSZ thin films on SiO2 glass substrate showed dependence of the coherency at the columnar grain boundaries, but the value is higher than those of the films on MgO or Al2O3 substrates by more than 20 kJ/mol. Structural and compositional analyses clarified that the second phase of SiO2 is segregated at mid-gaps between columnar grain boundaries in YSZ thin films on a SiO2 glass substrate. Results show that two factors affect ionic conductivity at the columnar grain boundaries in YSZ thin films: structural coherency and the second phase of ionic insulator.

Original languageEnglish
Pages (from-to)430-435
Number of pages6
JournalJournal of the Ceramic Society of Japan
Volume122
Issue number1426
DOIs
Publication statusPublished - 2014 Jun

Keywords

  • Coherency
  • Columnar structure
  • Grain boundary
  • HAADF-STEM
  • Ionic conduction
  • Tem
  • Thin film
  • Zirconia

ASJC Scopus subject areas

  • Ceramics and Composites
  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry

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