Penetration of water into yttrium- and scandium-doped barium zirconate and its relation to proton conductivity

Y. Nose, Y. Okumura, S. Imashuku, K. Suehiro, T. Uda, Y. Awakura

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

The diffusion coefficient and amount of water in trivalent cation doped barium zirconate were investigated by thermogravimetry. The apparent diffusion coefficient of water of yttrium-doped barium zirconate which was sintered for 24 hours, Y24, was 2.9 × 10-11 m2 s-1 at 700 °C under pH2O= 0.05 atm. The diffusion coefficient is almost independent of the sintering period. This means that the diffusion coefficient is independent of the grain size. The ratio of water to oxide ion vacancy before water introduction was evaluated from weight change of water in thermogravimetry. This ratio in Y24 is about 32 % and 62 % at 600 °C and 500 °C, respectively. Electric conductivity of sintered pellets was also measured. In S24, which is scandium-doped barium zirconate sintered for 24 hours, the change of the bulk conductivity after change of the atmosphere from dry to wet was governed by the diffusion of water. It takes more than 10 hours to thermodynamically complete full hydration of the specimen in the disk with the diameter of 10 mm and thickness of 1.5 mm even at 700 °C.

Original languageEnglish
Title of host publicationThe Minerals, Metals and Materials Society - 3rd International Conference on Processing Materials for Properties 2008, PMP III
Pages223-228
Number of pages6
Publication statusPublished - 2009 Dec 1
Externally publishedYes
Event3rd International Conference on Processing Materials for Properties 2008, PMP III - Bangkok, Thailand
Duration: 2008 Dec 72008 Dec 10

Publication series

NameThe Minerals, Metals and Materials Society - 3rd International Conference on Processing Materials for Properties 2008, PMP III
Volume1

Other

Other3rd International Conference on Processing Materials for Properties 2008, PMP III
CountryThailand
CityBangkok
Period08/12/708/12/10

Keywords

  • Amount of water
  • Barium zirconate
  • Diffusion of water
  • Perovskite-type oxide

ASJC Scopus subject areas

  • Materials Science(all)

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