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KMID : 1059519910350040422
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Journal of the Korean Chemical Society
1991 Volume.35 No. 4 p.422 ~ p.426
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Alum and Hydroxide Routes to α-Al2O3 (Ⅱ) Ultra-Fine Alumina by Thermal Decomposition
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Choy Jin-Ho
Yoo Jong-Seok
KIm Jin-Tae
Lee Chang-Kyo
Lee Nang-Ho
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Abstract
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In order to synthesize high-purity alpha alumina fine powder, the aluminum hydroxide and ammonium aluminum sulfate(alum) precursor were prepared from natural alumino-silicate(halloysite). The thermal decomposition mechenism for both precursors was elucidated by DTA/TG, XRD and IR analysis. The microstructure, specific surface area and purity of α-Al2O3 were characterized by SEM, and BET analysis. The particle size of α-Al2O3 was determined to be φ = 0.1∼0.5 μm. However, the specific surface area for the alum derived α-Al2O3(89.0 m2/g) was extremely higher than that for the aluminum hydroxide derived one(7.3 m2/g).
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