Please use this identifier to cite or link to this item: doi:10.22028/D291-24734
Title: Crystallization kinetics of mullite formation in diphasic gels containing different alumina components
Author(s): Tkalcec, Emilija
Ivankovic, Hrvoje
Nass, Rüdiger
Schmidt, Helmut K.
Language: English
Year of Publication: 2003
OPUS Source: Journal of the European Ceramic Society. - 23. 2003, 9, S. 1465-1475
SWD key words: Kristallisation
Aluminium oxydatum
DDC notations: 620 Engineering and machine engineering
Publikation type: Journal Article
Abstract: The crystallization kinetics of mullite formation in diphasic gels containing TEOS-derived amorphous silica and alumina component in different crystalline form and particle size has been studied using quantitative X-ray diffraction (QXRD) with 3:2 mullite as a standard and transmission electron microscopy (TEM). As the source of alumina component, aluminum nitrate nonahydrate, commercial gamma-Al2O3 and boehmite (gamma-AlOOH) were used. The results were consistent with previous studies which indicated that mullite forms initially by nucleation and growth. During the second slow stage of transformation, mullite with approximate 2:1 composition subsequently converts further into 3:2. This process is the fastest in the precursor with the smallest particle size of alumina, and the slowest in the sample with boehmite-derived alumina. In very fine scale of morphology the conversion of 2:1 mullite started even in the first stage of transformation.
Link to this record: urn:nbn:de:bsz:291-scidok-30588
Date of registration: 9-Dec-2010
Faculty: SE - Sonstige Einrichtungen
Department: SE - INM Leibniz-Institut für Neue Materialien
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