Preparation, structural and microstructural properties of Ba0.64Ca0.32Al2Si2O8 ceramics phase

Abstract

Monoclinic celsian has been prepared from Ba-LTA zeolite precursor. The Ca2+-texchanged hexacelsian (HCCa,) synthesized from Ba-LTA zeolite precursors was used for preparation of monoclinic celsian (MCCa). The partially ion exchange diphyllosilicate has a composition of Ba0.64Ca0.32Al2Si2O8 (HCCa). It was found that prepared HCCa phase is stable between room temperature and 1300 degrees C. During prolonged heating this phase is polymorphic transformed to Ba, Ca-celsian feldspar. Synthesis of Ba, Ca-celsian and thermal behavior during transformation processes was observed by XRD method. The crystal structure and microstructural parameters were refined using Rietveld method. The crystal morphology of thermal treated samples was observed by SEM/EDAX analysis. (C) 2011 Elsevier Ltd and Techna Group S.r.l. All rights reserved.