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2009 | 7 | 2 | 205-210
Tytuł artykułu

Kinetic studies on leucite precursors

Treść / Zawartość
Warianty tytułu
Języki publikacji
EN
Abstrakty
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. [...]
Słowa kluczowe
Wydawca

Czasopismo
Rocznik
Tom
7
Numer
2
Strony
205-210
Opis fizyczny
Daty
wydano
2009-06-01
online
2009-04-09
Twórcy
  • Department of Glass and Ceramics, Institute of Chemical Technology, 160 00, Prague, Czech Republic
  • Laboratory of Inorganic Materials, Institute of Inorganic Chemistry of AS CR and ICT, 166 28, Prague, Czech Republic
Bibliografia
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Typ dokumentu
Bibliografia
Identyfikatory
Identyfikator YADDA
bwmeta1.element.-psjd-doi-10_2478_s11532-009-0003-5
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