C-axis oriented β″-alumina ceramics with anisotropic ionic conductivity prepared by spark plasma sintering

Kazuto Koganei, Toshihisa Oyama, Miki Inada, Naoya Enomoto, Katsuro Hayashi

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

High-density β″-alumina with relative density exceeding 98% was obtained by spark plasma sintering (SPS) at 1400 °C for 15 min. X-ray diffraction measurements and scanning electron microscopy demonstrated that the c-axis of the β″-alumina grains oriented along the direction of pressure application during SPS. Na volatilization was well suppressed by encapsulation in a carbon die and a short sintering time. Higher ionic conductivity was observed along the vertical direction than along the direction of pressure application owing to the alignment of the conduction plane in β″-alumina crystals. The highest total conductivity at 25 °C was 1.9 × 10- 2 S·cm- 1.

Original languageEnglish
Pages (from-to)22-26
Number of pages5
JournalSolid State Ionics
Volume267
DOIs
Publication statusPublished - Dec 1 2014

All Science Journal Classification (ASJC) codes

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

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