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.
|ジャーナル||Journal Wuhan University of Technology, Materials Science Edition|
|出版物ステータス||Published - 2016 2 1|
ASJC Scopus subject areas
- Materials Science(all)