Kinetic studies on leucite precursors

• Authors: Martina Mrázová , Alexandra Kloužková , Martina Kohoutková
• Languages of publication: EN

Abstracts

EN

Kinetic studies were performed on two types of leucite precursors. These precursors were prepared using a hydrothermal method at 150°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°C, 900°C, 950°C, 1000°C and 1050°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-Eroféev model is the most appropriate to describe the experimental data. Using the Avrami-Eroféev model n reaches an average value of 2.9 which is connected with the three-dimensional growth of nuclei. The calculated activation energy of crystallization of leucite was 385 kJ mol-1 for non-seeded precursors and 246 kJ mol-1 for seeded precursors, respectively. [...]

• Publisher: De Gruyter Open
• Journal: Open Chemistry
• Year: 2009
• Volume: 7
• Issue: 2
• Pages: 205-210

Dates

published

1 - 6 - 2009

online

9 - 4 - 2009

Contributors

author

Martina Mrázová

author

Alexandra Kloužková

• Department of Glass and Ceramics, Institute of Chemical Technology, 160 00, Prague, Czech Republic

author

Martina Kohoutková

• Laboratory of Inorganic Materials, Institute of Inorganic Chemistry of AS CR and ICT, 166 28, Prague, Czech Republic

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Identifiers

DOI

10.2478/s11532-009-0003-5