Electric properties of [(ZrO2)0.8(CeO2)0.2] 0.9(CaO)0.1 solid solution

Ken Ichi Kawamura, Kensuke Watanabe, Yutaka Nigara, Atsushi Kaimai, Tatsuya Kawada, Junichiro Mizusaki

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10 Citations (Scopus)

Abstract

The oxygen nonstoichiometry, the total conductivity, and the electronic conductivity of [(ZrO2)0.8(CeO2)0.2] 0.9(CaO)0.1 were measured by using high temperature gravimetry, dc four-terminal method, and Hebb-Wagner's dc polarization technique, respectively. The change in the oxygen nonstoichiometry was explained by assuming Ce′Zr, Ca″zr, and VO•• as major defects. At 1173 K and pO2 = 1 ∼ 10-11 atm, the total conductivity corresponded to the ionic conductivity is proportional to [VO••]. At the lower p02, although the oxygen vacancy increased with the decreasing pO2, the ionic conductivity decreased. The relation between [VO••] and the ionic conductivity was similar to that in stabilized ZrO2 with various CaO contents. It was shown that the electronic conductivity is proportional to [Ce′Zr, which is not in accordance with the hopping-type conduction between Ce3+ and Ce4+. Assuming all Ce′Zr release conduction electrons, the calculated mobility is in the order of 10-6 cm2 V-1 s-1 at 1173 K and does not correspond to the band conduction model. It was considered that most of the electrons are trapped at the donor level formed by Ce′Zr and only a small portion of the electrons is excited to conduction band as carriers.

Original languageEnglish
Pages (from-to)2552-2558
Number of pages7
JournalJournal of the Electrochemical Society
Volume145
Issue number7
DOIs
Publication statusPublished - 1998 Jul

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films
  • Electrochemistry
  • Materials Chemistry

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