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.
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Funded by the Ministry of Education, Culture, Sports, Science and Technology, a Grant-in-Aid for Challenging Exploratory Research (No. 26560235), the ARCMG–IMR Cooperative Program (No. 14G0402) of Tohoku University, and the China Scholarship Council and the 111 Project (No.B13035) of China
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Chen, C., Katsui, H. & Goto, T. Synthesis of sodium beta alumina films by heat treatment of sodium aluminum oxides. J. Wuhan Univ. Technol.-Mat. Sci. Edit. 31, 6–10 (2016). https://doi.org/10.1007/s11595-016-1320-0
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DOI: https://doi.org/10.1007/s11595-016-1320-0