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Kinetic studies on leucite precursors
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SYSNO ASEP 0340094 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Kinetic studies on leucite precursors Author(s) Mrázová, M. (CZ)
Kloužková, A. (CZ)
Kohoutková, Martina (UACH-T)Source Title Central European Journal of Chemistry - ISSN 1895-1066
Roč. 7, č. 2 (2009), s. 205-210Number of pages 6 s. Language eng - English Country PL - Poland Keywords leucite ; crystallization kinetics ; hydrothermal Subject RIV JH - Ceramics, Fire-Resistant Materials and Glass R&D Projects 2A-1TP1/063 GA MPO - Ministry of Industry and Trade (MPO) CEZ AV0Z40320502 - UACH-T (2005-2011) UT WOS 000265019100009 DOI 10.2478/s11532-009-0003-5 Annotation Kinetic studies were performed on two types of leucite precursors. These precursors were prepared using a hydrothermal method at 150 degrees C; the reaction time was 1.5 hours. In order to obtain precursors having different amounts of seed the molarity of KOH was changed. These intermediate products were subsequently calcinated from 5 minutes to 72 hours at temperatures of 850 degrees C, 900 degrees C, 950 degrees C, 1000 degrees C and 1050 degrees C. The crystallinities of the powders were calculated by X-ray diffraction analysis. The crystallization curves for the synthesis of leucite exhibited a typical sigmoidal characteristic. Using different kinetic equations it was found that the Avrami-Erofeev model is the most appropriate to describe the experimental data. Using the Avrami-Erofeev model n reaches an average value of 2.9 which is connected with the three-dimensional growth of nuclei. Workplace Institute of Inorganic Chemistry Contact Jana Kroneislová, krone@iic.cas.cz, Tel.: 311 236 931 Year of Publishing 2010
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