Abstract
The Li+- and Na+-doped hexacelsians (HC) synthesized from Ba-LTA synthetic zeolite as precursors were used for preparation of monoclinic celsians (MC). The doped pure MC and mixture HC/MC species were obtained by thermally induced polymorphous transformation at 1200 C. Synthesized-doped MC have been characterized by X-ray powder diffraction and spectroscopic (infrared, Raman and 29Si magic angle spinning nuclear magnetic resonance) methods. The obtained results suggest that in all investigated samples Na+ or Li+ dopants were incorporated in MC crystal structures during thermal transformation of a zeolite. It has been shown that HC → MC transformation depends on molar fractions of alkali cations. These findings combined with used temperature/time conditions could help in optimization of MC synthesis route.
Original language | English (US) |
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Pages (from-to) | 2827-2832 |
Number of pages | 6 |
Journal | Journal of Physics and Chemistry of Solids |
Volume | 69 |
Issue number | 11 |
DOIs | |
State | Published - Nov 2008 |
Keywords
- Ceramics
- Chemical synthesis
- Crystal structure
- Phase transitions
ASJC Scopus subject areas
- General Chemistry
- General Materials Science
- Condensed Matter Physics