TY  - JOUR
AU  - Dimitrijević, Radovan
AU  - Dondur, Vera
AU  - Vulić, Predrag
AU  - Marković, Smilja
AU  - Macura, Slobodan
PY  - 2004
UR  - https://dais.sanu.ac.rs/123456789/16226
AB  - Using the zeolite thermally induced transformation route and starting from Na-LTA, Na-FAU and Na-GIS zeolites as precursors, we synthesized pure sodium nephelines (ps-Ne) with Si/Al ratios between 1.0 and 1.5 (ps-NeLTA, ps-NeFAU, ps-NeGIS). By X-ray diffraction analysis of intermediaries, we found that ps-NeLTA and ps-NeFAU were obtained as polymorphous transformation products from carnegieite phases and ps-NeGIS was synthesized directly from amorphous zeolite precursor. Stoichiometric ps-NeLTA {Na8[Al8Si8]16O32} and nonstoichiometric ps-NeFAU {(Na7.20A0.80)8[Al7.20Si8.80]16O32} and ps-NeGIS {(Na6.41A1.59)8[Al6.41Si9.59]16O32} were obtained at temperatures 900– 1200 8C. The crystal structures of these ps-Ne-s were refined in the P63 space group, from X-ray powder data using the Rietveld method. Mean T – O bond lengths decreases almost linearly with increasing the Si/Al ratio. These changes are induced by short-range order–disorder of Si, Al cations through the TG and TS sites. The increase of short-range disorder over T-sites, is followed and confirmed by 29Si MAS NMR and IR spectroscopy. Comparison of the Si/Al ordering of synthesized ps-Ne structures with the published data shows inverse segregation of framework cations (Si; T1 ¼ T4 and Al; T2 ¼ T3). That is probably a consequence of applied synthesis route.
T2  - Journal of Physics and Chemistry of Solids
T1  - Structural characterization of pure Na-nephelines synthesized by zeolite conversion route
SP  - 1623
EP  - 1633
VL  - 65
IS  - 10
DO  - 10.1016/j.jpcs.2004.03.005
UR  - https://hdl.handle.net/21.15107/rcub_dais_16226
ER  - 

@article{
author = "Dimitrijević, Radovan and Dondur, Vera and Vulić, Predrag and Marković, Smilja and Macura, Slobodan",
year = "2004",
abstract = "Using the zeolite thermally induced transformation route and starting from Na-LTA, Na-FAU and Na-GIS zeolites as precursors, we synthesized pure sodium nephelines (ps-Ne) with Si/Al ratios between 1.0 and 1.5 (ps-NeLTA, ps-NeFAU, ps-NeGIS). By X-ray diffraction analysis of intermediaries, we found that ps-NeLTA and ps-NeFAU were obtained as polymorphous transformation products from carnegieite phases and ps-NeGIS was synthesized directly from amorphous zeolite precursor. Stoichiometric ps-NeLTA {Na8[Al8Si8]16O32} and nonstoichiometric ps-NeFAU {(Na7.20A0.80)8[Al7.20Si8.80]16O32} and ps-NeGIS {(Na6.41A1.59)8[Al6.41Si9.59]16O32} were obtained at temperatures 900– 1200 8C. The crystal structures of these ps-Ne-s were refined in the P63 space group, from X-ray powder data using the Rietveld method. Mean T – O bond lengths decreases almost linearly with increasing the Si/Al ratio. These changes are induced by short-range order–disorder of Si, Al cations through the TG and TS sites. The increase of short-range disorder over T-sites, is followed and confirmed by 29Si MAS NMR and IR spectroscopy. Comparison of the Si/Al ordering of synthesized ps-Ne structures with the published data shows inverse segregation of framework cations (Si; T1 ¼ T4 and Al; T2 ¼ T3). That is probably a consequence of applied synthesis route.",
journal = "Journal of Physics and Chemistry of Solids",
title = "Structural characterization of pure Na-nephelines synthesized by zeolite conversion route",
pages = "1623-1633",
volume = "65",
number = "10",
doi = "10.1016/j.jpcs.2004.03.005",
url = "https://hdl.handle.net/21.15107/rcub_dais_16226"
}

Dimitrijević, R., Dondur, V., Vulić, P., Marković, S.,& Macura, S.. (2004). Structural characterization of pure Na-nephelines synthesized by zeolite conversion route. in Journal of Physics and Chemistry of Solids, 65(10), 1623-1633.
https://doi.org/10.1016/j.jpcs.2004.03.005
https://hdl.handle.net/21.15107/rcub_dais_16226

Dimitrijević R, Dondur V, Vulić P, Marković S, Macura S. Structural characterization of pure Na-nephelines synthesized by zeolite conversion route. in Journal of Physics and Chemistry of Solids. 2004;65(10):1623-1633.
doi:10.1016/j.jpcs.2004.03.005
https://hdl.handle.net/21.15107/rcub_dais_16226 .

Dimitrijević, Radovan, Dondur, Vera, Vulić, Predrag, Marković, Smilja, Macura, Slobodan, "Structural characterization of pure Na-nephelines synthesized by zeolite conversion route" in Journal of Physics and Chemistry of Solids, 65, no. 10 (2004):1623-1633,
https://doi.org/10.1016/j.jpcs.2004.03.005 .,
https://hdl.handle.net/21.15107/rcub_dais_16226 .