Počet záznamů: 1

Kinetic studies on leucite precursors

  1. 1.
    0340094 - UACH-T 2010 RIV PL eng J - Článek v odborném periodiku
    Mrázová, M. - Kloužková, A. - Kohoutková, Martina
    Kinetic studies on leucite precursors.
    Central European Journal of Chemistry. Roč. 7, č. 2 (2009), s. 205-210 ISSN 1895-1066
    Grant CEP: GA MPO 2A-1TP1/063
    Výzkumný záměr: CEZ:AV0Z40320502
    Klíčová slova: leucite * crystallization kinetics * hydrothermal
    Kód oboru RIV: JH - Keramika, žáruvzdorné materiály a skla
    Impakt faktor: 1.065, rok: 2009

    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.
    Trvalý link: http://hdl.handle.net/11104/0183413