Please use this identifier to cite or link to this item: http://www.repository.rmutt.ac.th/xmlui/handle/123456789/392
Title: Phase transformation behavior of nanocrystalline chi-alumina powder obtained by thermal decomposition of AIP in inert organic solvent
Authors: Mekasuwandumrong, O
Praserthdam, P
Inoue, M
Pavarajarn, V
Tanakulrungsank, W
Keywords: ALPHA-ALUMINA
GAMMA-ALUMINA
TRANSITION
ADDITIVES
BOEHMITE
Issue Date: 1-Apr-2004
Publisher: KLUWER ACADEMIC PUBL
Citation: Web of Science
Series/Report no.: JOURNAL OF MATERIALS SCIENCE;
Abstract: Thermal decomposition of aluminum isopropoxide (AIP) in inert organic solvents ( toluene and mineral oil) resulted in the formation of chi-alumina. Phase evolution by calcination at various temperatures for this alumina was studied via X-ray diffraction. The results suggest a direct transformation from chi-alumina to alpha-alumina at approximately 1180degreesC, without the formation of kappa-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 &chi;-alumina crystal transforms into one &alpha;-alumina crystal at its critical size in a nucleation step. This crystal exhibits a rapid grain growth following the transformation. (C) 2004 Kluwer Academic Publishers.
URI: http://www.repository.rmutt.ac.th/dspace/handle/123456789/392
ISSN: 22-2461
Appears in Collections:บทความ (Article)

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