Fabrication and electrical characterization of 15% yttrium-doped barium zirconate - Nitrate freeze drying method combined with vacuum heating

Susumu Imashuku, Tetsuya Uda, Yoshitaro Nose, Yasuhiro Awakura

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

We applied a nitrate freeze-drying method to obtain a fine synthesized powder of 15% yttrium-doped barium zirconate. Fine 15% yttrium-doped barium zirconate powder of particle size about 30 nm was obtained by synthesizing at 500 °C in vacuum from a powder mixed by the nitrate freeze-drying method. However, we could not obtain such fine powder by synthesizing in air. Using the powder synthesized in vacuum, large and homogeneous grains of 15% yttrium-doped barium zirconate were easily obtained after sintering. Then, the bulk and grain boundary resistance were evaluated by AC 2-terminal measurement of sample in the form of bar and pellet and DC 4-terminal measurement of bar-shape sample. The grain boundary resistance was not inversely proportional to the grain size as theoretically expected. We concluded that specific grain boundary conductivity varies with samples. Some impurities, evaporation loss of barium oxide and/or other unexpected reasons might affect the grain boundary resistance in 15% yttrium-doped barium zirconate.

Original languageEnglish
Pages (from-to)3872-3879
Number of pages8
JournalJournal of Alloys and Compounds
Volume509
Issue number9
DOIs
Publication statusPublished - 2011 Mar 3
Externally publishedYes

Keywords

  • Barium zirconate
  • Fuel cell
  • Grain boundary
  • Nitrate freeze-drying method

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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