Electrical conduction properties of rare earth orthophosphates under reducing conditions

Naoto Kitamura, Koji Amezawa, Yoshiharu Uchimoto, Yoichi Tomii, Teiichi Hanada, Naoichi Yamamoto

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Electrical conduction properties of Sr-doped PrPO4, NdPO4 and SmPO4 with the monazite structure were investigated at 500-925 °C under H2/H2O reducing conditions. From H/D isotope effects and p(H2)-dependencies of the conductivities, it was found that the materials dominantly conducted protons under the wet reducing conditions although the materials slightly showed n-type electronic conduction at higher temperatures. Based on p(H2O) and p(H2)-dependencies of the conductivities, defect structures of the materials under the reducing conditions were discussed. As a result, it was considered that major positive defects were oxygen deficits at higher temperatures and protons at lower temperatures.

Original languageEnglish
Pages (from-to)2369-2373
Number of pages5
JournalSolid State Ionics
Volume177
Issue number26-32 SPEC. ISS.
DOIs
Publication statusPublished - 2006 Oct 31
Externally publishedYes

Keywords

  • Defect
  • High temperature protonic conduction
  • Rare earth orthophosphate

ASJC Scopus subject areas

  • Electrochemistry
  • Physical and Theoretical Chemistry
  • Energy Engineering and Power Technology
  • Materials Chemistry
  • Condensed Matter Physics

Fingerprint Dive into the research topics of 'Electrical conduction properties of rare earth orthophosphates under reducing conditions'. Together they form a unique fingerprint.

  • Cite this

    Kitamura, N., Amezawa, K., Uchimoto, Y., Tomii, Y., Hanada, T., & Yamamoto, N. (2006). Electrical conduction properties of rare earth orthophosphates under reducing conditions. Solid State Ionics, 177(26-32 SPEC. ISS.), 2369-2373. https://doi.org/10.1016/j.ssi.2006.06.009