Abstract
By using the thermally induced phase transformation initial zeolites were converted into pure carnegieite, stuffed derivative of cristobalite. The polymorphs obtained from Na-LTA are stoichiometric (NaAlSiO4), since those obtained from Na-FAU zeolite are non-stoichiometric (Na1-xAl1-xSi1+xO4). Stoichiometric carnegieite have cubic structure, while non-stoichiometric carnegieite crystallized in cubic and orthorhombic forms. 29Si MAS NMR spectra show a very large but expecting difference between stoichiometric and non-stoichiometric carnegieite. The spectrum of stoichiometric carnegieite has only one peak Si(4Al), while the spectrum of non-stoichiometric carnegieite consist few superimposed peaks assigned to Si(4Al), Si(3Al), Si(2Al), Si(1Al) and Si(0Al). DTA study indicates the occurrence of displacive phase transition of all synthesized carnegieite. The transition temperature is depending on silicon aluminum order: T m=690°C for stoichiometric, T m=565 and 660°C for non-stoichiometric, low-temperature and high-temperature carnegieite, respectively.
Similar content being viewed by others
References
D. C. Palmer, Reviews in Mineralogy, 29 (1995) 83.
M. T. Dove, Am. Miner., 82 (1997) 213.
D. de Ligny, P. Richet, E. F. Westrum Jr. and J. Roux, Phys. Chem. Miner., 29 (2002) 267.
V. Dondur and R. Dimitrijevic, J. Solid State Chem., 63 (1986) 46.
R. Dimitrijevic and V. Dondur, J. Solid State Chem., 115 (1995) 214.
V. Dondur, S. Markovic, R. Dimitrijevic and M. Mitrovic, Mat. Sci. Forum, 352 (2000) 105.
C. Kosanovic, B. Subotic, I. Smit, A. Cizmek, M. Stubicar and A. Tonejc, J. Mat. Sci., 32 (1997) 73.
J. M. Newsam, J. Phys. Chem., 92 (1988) 445.
P. Norby, Zeolites, 10 (1990) 193.
B. Badger and F. A. Hummel, J. Am. Ceram. Soc., 68 (1985) C-46.
W. Schmitz, H. Siegel and R. Schollner, Cryst. Res. Technol., 16 (1981) 385.
R. Dimitrijevic, V. Dondur, P. Vulic, S. Markovic and S. Macura (in press).
M. Rokita, M. Handke and W. Mozgawa, J. Mol. Struct., 511–512 (1999) 277.
A. Dyer, in An Introduction to Zeolite Molecular Sieves, Wiley, Chichester 1988.
M. Handke and W. Mozgawa, J. Mol. Struct., 348 (1995) 341.
M. Handke and W. Mozgawa, Vib. Spectroscopy, 5 (1993) 75.
E. M. Flanigan, H. Khatami and H. A. Szymanski, Adv. Chem. Series, 101 (1971) 201.
G. Engelhardt and D. Michel, in High-Resolution Solid-State NMR of Silicates and Zeolite, Wiley, Chichester 1987.
J. F. Stebbins, in Mineral Physics and Crystallography, A Handbook of Physical Constants, American Geophysical Union 1995, p. 303.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Dondur, V., Markovic, S., Dimitrijevic, R. et al. Reconstructive and displacive transformations of tectosilicates. Journal of Thermal Analysis and Calorimetry 72, 373–381 (2003). https://doi.org/10.1023/A:1023969130688
Issue Date:
DOI: https://doi.org/10.1023/A:1023969130688