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Phase transformation behavior of nanocrystalline χ-alumina powder obtained by thermal decomposition of AIP in inert organic solvent

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Abstract

Thermal decomposition of aluminum isopropoxide (AIP) in inert organic solvents (toluene and mineral oil) resulted in the formation of χ-alumina. Phase evolution by calcination at various temperatures for this alumina was studied via X-ray diffraction. The results suggest a direct transformation from χ-alumina to α-alumina at approximately 1180°C, without the formation of κ-alumina phase, while still maintaining the small particle size (<100 nm). The transformation behavior was observed by TEM and the crytallite size was calculated by the Scherrer equation. The results indicate one χ-alumina crystal transforms into one α-alumina crystal at its critical size in a nucleation step. This crystal exhibits a rapid grain growth following the transformation.

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Authors and Affiliations

  1. Research Center on Catalysis and Catalytic Reaction Engineering, Department of Chemical Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok, 10330, Thailand;

    O. Mekasuwandumrong, P. Praserthdam & V. Pavarajarn

  2. Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Kyoto, 606-8077, Japan

    O. Mekasuwandumrong

  3. Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Kyoto, 606-8077, Japan

    M. Inoue

  4. Department of Chemical Engineering, Faculty of Engineering, Rajamangala Institute of Technology, Pathumthani, 12110, Thailand

    W. Tanakulrungsank

Authors
  1. O. Mekasuwandumrong
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  2. P. Praserthdam
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  3. M. Inoue
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  4. V. Pavarajarn
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  5. W. Tanakulrungsank
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Mekasuwandumrong, O., Praserthdam, P., Inoue, M. et al. Phase transformation behavior of nanocrystalline χ-alumina powder obtained by thermal decomposition of AIP in inert organic solvent. Journal of Materials Science 39, 2417–2421 (2004). https://doi.org/10.1023/B:JMSC.0000020004.41419.0f

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  • DOI: https://doi.org/10.1023/B:JMSC.0000020004.41419.0f

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