Fabrication of oriented β-alumina from porous bodies by slip casting in a high magnetic field

Yoshio Sakka, Atsushi Honda, Tohru S. Suzuki, Yusuke Moriyoshi

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

Designing texture is one possible way for improving the electrical, chemical, mechanical and other properties of ceramics. We have reported that oriented α-alumina was obtained by slip casting in a high magnetic field followed by sintering. β-Alumina is well known as sodium ion conductor used in a sodium-sulfur battery. β-Alumina consists of spinel blocks and ion conductive planes. Since the direction of the ion conductive plane of polycrystalline β-alumina is random, the ionic conductivity of the polycrystal is lower than that of the single crystal. The purpose of this study is to prepare oriented β-alumina to enhance the sodium ion conductivity. Oriented β-alumina was prepared by the following method: (1) oriented α-alumina green bodies were prepared by colloidal processing in a high magnetic field, (2) the oriented α-alumina green bodies were infiltrated with Na2O and MgO, and (3) the oriented β-alumina bodies were synthesized by reaction sintering at 1600 and 1700 °C. The reaction product and orientation of the β-alumina were confirmed by XRD.

Original languageEnglish
Pages (from-to)341-347
Number of pages7
JournalSolid State Ionics
Volume172
Issue number1-4 SPEC. ISS.
DOIs
Publication statusPublished - 2004 Aug 31
Externally publishedYes

Keywords

  • High magnetic field
  • Infiltration
  • Reaction sintering
  • Slip casting
  • Texture
  • β-Alumina

ASJC Scopus subject areas

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

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