Preparation and characterisation of analcime by X-ray and SEM.

Martina Novotná1, Alexandra Kloužková2 and Jaroslav Maixner3


1Laboratory of Inorganic Material, Institute of Inorganic Chemistry, AS CR, Praha, Czech Republic  

2Department of Glass and Ceramics, Institute of Chemical Technology,  Praha, Czech Republic

3Central Laboratories, Institute of Chemical Technology, Praha, Czech Republic  


Leucite( KAlSi2O6) based materials having high fracture toughness and being useful for making ceramic-fused-to-metal restorations [1] represent a very promising composite material for dental applications.  For its extensive use is, however, necessary to develop a suitable and reproducible technology of its preparation. This can be achieved either by the direct hydrothermal synthesis of leucite or by the ion-exchange of analcime (NaAlSi2O6·H2O) as a precursor. The purpose of this study was to investigate the synthesis of analcime and the effect of principal factors influencing its crystallisation. Analcime powders were prepared by hydrothermal synthesis in a Teflon lined stainless steel autoclave. The role of the  composition of the reaction mixture (source materials, silica/alumina ratio, OH- concentration, and water concentration), reaction temperature and time was studied.

 [1] J.R.Kelly, Annu. Rev. Mater. Sci., 27, (1997), 443-.