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J. Korean Ceram. Soc. > Volume 31(12); 1994 > Article
Journal of the Korean Ceramic Society 1994;31(12): 1501.
급격산화법에 의해 제조된 $delta$-FeOOH의 열분해과정
박영도, 이훈하, 김태옥
부산대학교 무기재료공학과
The Thermal Decomposition Process of $delta$-FeOOH Prepared by Rapid Oxidation Method
The precipitate of FeCl2.4H2O and NaOH, Fe(OH)2 was rapidly made to oxidize by H2O2 to prepare $delta$-FeOOH. The particle size, surface and morphology of $delta$-FeOOH, and the shape and structure of thermally decomposed $delta$-FeOOH were investigated by the use of high resolution STEM. $delta$-FeOOH prepared under the condition of reaction temperature of Fe(OH)2 at 4$0^{circ}C$, [OH-][Fe2+]=5 and aging time of 2 hr Fe(OH)2, had 630$AA$ mean particle size, 4~5 aspect ratio, 20.8 emu/g saturation magnetization and 210 Oe coercivity. The edges of $delta$-FeOOH were inclined to (001) about 41$^{circ}$, 60$^{circ}$ and coincident with (102), (101) respectively. When $delta$-FeOOH was thermally decomposed at 25$0^{circ}C$ for 2 hr in vacuo, which had micropores of 0.9 nm thickness and crystallites of 2.4 nm thickness. (001)hex, [10]hex. of $delta$-FeOOH parallel with (001)hex, [100]hex. of $alpha$-Fe2O3 respectively. This showed three dimensional topotaxial structure transition, which was investigated by SADP (Selected Area Diffraction Pattern) of STEM.
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