Synthesis of sodium beta alumina films by heat treatment of sodium aluminum oxides

Chi Chen, Hirokazu Katsui, Takashi Goto

Research output: Contribution to journalArticle

Abstract

Sodium beta alumina (Na-β-alumina) films were synthesized by heat treatment of NaAl6O9.5 and γ-NaAlO2 films at temperatures of 1 373-1 573 K. Single-phase γ-NaAlO2 and NaAl6O9.5 films were prepared by laser chemical vapor deposition at the deposition temperatures of 976 and 1 100 K, respectively. Subsequent heat treatment of the films resulted in the formation of Na-β-alumina with α-Al2O3 at temperatures above 1 373 K for NaAl6O9.5 and 1 473 K for γ-NaAlO2. On heat treatment at temperatures of 1 473-1 573 K, the faceted morphology with terraces of the as-deposited (110)-oriented γ-NaAlO2 films transformed to a porous morphology with platelet grains comprising Na-β-alumina and α-Al2O3. On heat treatment at temperatures of 1 373-1 473 K, the pyramidal, faceted grains of as-deposited NaAl6O9.5 films transformed to planer, shapeanisotropic morphology in the film of mixed Na-β-alumina and α-Al2O3. A dense morphology was observed in both the as-deposited and heat-treated NaAl6O9.5 films.

Original languageEnglish
Pages (from-to)6-10
Number of pages5
JournalJournal Wuhan University of Technology, Materials Science Edition
Volume31
Issue number1
DOIs
Publication statusPublished - 2016 Feb 1

Keywords

  • chemical vapor deposition
  • heat treatment
  • morphology
  • sodium beta alumina

ASJC Scopus subject areas

  • Materials Science(all)

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