Silicon nitride ceramics with sodium ion conductive grain boundary phase

Hirokazu Kawaoka, Tohru Sekino, Takafumi Kusunose, Koichi Niihara

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)


Sodium ion-conductive silicon nitride ceramic with Na2O-Al 2O3-SiO2 glass as the grain boundary phase was fabricated by adding Na2CO3, Al2O3, and SiO2 as sintering additives. The electrical conductivity was two and four orders of magnitude higher than that of Si3N4 ceramic with Y2O3 and Al2O3 additives at 100 and 1000°C, respectively. This result clearly indicates that ionic conductivity can be provided to insulating structural ceramics by modification of the grain boundary phase without dispersion of conductive particles.

Original languageEnglish
Pages (from-to)2752-2755
Number of pages4
JournalJournal of Materials Research
Issue number12
Publication statusPublished - 2003 Dec

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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