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J. Korean Ceram. Soc. > Volume 23(6); 1986 > Article
Journal of the Korean Ceramic Society 1986;23(6): 71.
복합 황산염 수화물의 열분해에 의한 Mg-Al 스피넬의 생성반응
박홍채, 오기동
부산대학교 무기재료공학과
Reaction Processes of the Formation of Mg-Al Spinel by a Thermal Decomposition of a Mixed Sulfate Hydrate
The forming reaction processes of magnesium aluminate spinel by a thermal decomposition of sulfate hydrate were studied with DTA, TG. SEM and X-ray powder diffraction methods. The hydrous salt composed of the mixture of the two compounds of $MgSO_4$ $6H_2O$ and ${AL_2}({SO_4})_17H_2O_3$ in which both sulfates were crystalline. On heating the hydrous slat the crystalline magnesium and aluminum sulfate anhydride to amorphous alumina magnesium sulfate anhydride decomposed to amorphous magnesia and these amorphous oxides reacted completely each other to form a spinel at $1000^{circ}C$ The apparent activation energy of forming reaction of spinel was 36.5 kcal/mole($900^{circ}C$~$1000^{circ}C$) The crystallite size of spinel obtained at $1000^{circ}C$ after 1 h was 380$AA$
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