Protonic conduction in Rh-doped AZrO3 (A=Ba, Sr and Ca)

Tetsuo Shimura, Kazumasa Esaka, Hiroshige Matsumoto, Hiroyasu Iwahara

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Abstract

The conduction behavior of rhodium-doped AZrO3 (A=Ba, Sr and Ca) was investigated using electrical and electrochemical methods at elevated temperatures. The protonic conductivity of the Rh-doped AZrO3 in hydrogen was close to that of the Y-doped AZrO3. The transport numbers of the ions in hydrogen were unity in all the samples examined in this study. Under high-oxygen partial pressures, the conductivities of the Rh-doped AZrO3 were lower than those of the Y- or In-doped AZrO3, suggesting the low conductivity of electron holes. The oxygen partial pressure dependence of the conductivity indicates that a change in the valence of the rhodium ion might suppress the generation of mobile holes under a high-oxygen partial pressure condition.

Original languageEnglish
Pages (from-to)237-246
Number of pages10
JournalSolid State Ionics
Volume149
Issue number3-4
DOIs
Publication statusPublished - Aug 2 2002
Externally publishedYes

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All Science Journal Classification (ASJC) codes

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

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