Formation of Beta-Alumina from Metalkoxide

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J. Korean Ceram. Soc. > Volume 25(2); 1988 > Article

Journal of the Korean Ceramic Society 1988;25(2): 136.

금속알콕시이드로부터 $beta$-Alumina의 생성

공용식, 문종수¹, 이서우

부산대학교 무기재료공학과
¹경남대학교 무기재료공학과

Formation of Beta-Alumina from Metalkoxide

ABSTRACT

β-Al2O3, which is used for solid electrolyte membrances in sodium-sulfur batteries, was prepared by sol-gel process. Sodium-n-propoxide NaOC3H7 and aluminum-isopropoxide Al(OC3H7)3 were hydrolyzated in the solution at pH 3, pH 7, pH 9 and pH 11, respectively. The sol-gel processed samples were calcined at several temperature steps, respectively and analysed by thermal analyser(DT-TGA), infrared spectrum analyser and X-ray diffraction analyser. The gelling rate of solution at pH 7 was much higher than that of the solution at pH 3. Thermal exchanging behavior of the gels at pH 3 were similar to Na2O·Al2O3·6H2O and, above pH 7, were similar to Na2O·Al2O3·3H2O. When samples' composition ratio was 9.13 : 90.87 [NaOC3H7:Al(OC3H7)3] at pH 7, β-Al2O3 was formed at 1100℃.