Electrical conductivity of nonstoichiometric Ba β-alumina single crystals prepared by a floating zone method

An Yu Zhang, Takaya Akashi, Takashi Goto

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

Nonstoichiometric Ba β-alumina single crystals, Ba1 - 0.25xMg1 - xAl10 + xO17 + 0.25x (0 ≤ x ≤ 1), were prepared in the BaO-MgO-Al2O3 system by a floating zone method. The single crystals were cleaved parallel to a (001) plane. The electrical conductivity parallel to the cleavage plane (σ //) was 10 to 20 times greater than that perpendicular to the cleavage plane (σ). The σ// and σ had the maximum at around x = 0.5. The activation energy of σ, 240 to 270 kJ/mol, was slightly greater than that of σ//, 170 to 190 kJ/mol. The σ// was almost independent of oxygen partial pressure (PO2), while σ showed a PO2-1/6 dependence in a low PO2 region of PO2 = 10-4 to 10 -13 Pa.

Original languageEnglish
Pages (from-to)77-82
Number of pages6
JournalSolid State Ionics
Volume166
Issue number1-2
DOIs
Publication statusPublished - 2004 Jan 15

Keywords

  • Ba β-alumina
  • Electrical conductivity
  • Floating zone method
  • Nonstoichiometric
  • Single crystal

ASJC Scopus subject areas

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

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