Structural and spectroscopic characterization of the quenched hexacelsian Original Research Article

The hexacelsian with disorder distribution of the Si4+ and Al3+ is synthesized by thermally induced transformation of a Ba-LTA zeolite. The initial Ba-LTA zeolite is annealed and quenched to room temperature. The crystal structure and microstructure i.e. long-range ordering is investigated from the polycrystalline material by the Rietveld refinement procedure while short-range ordering is investigated by the 29Si and 27Al MAS NMR, Raman and luminescence (Eu3+ doped hexacelsian) spectroscopyʹs. The crystal structure (space group P63/mcm) and microstructure (size-strain analysis) results indicate disorder distribution of the Si4+ and Al3+. Analysis of the spectra indicates disorder distribution of the Si4+ and Al3+ (29Si and 27Al MAS NMR spectroscopy), dynamical disorder in the structure and site symmetry lowering for the Ba2+ site at a low temperature (Raman and luminescence spectroscopyʹs).