Structural and spectroscopic characterization of the quenched hexacelsian

Abstract

The hexacelsian with disorder distribution of the Si 4+ and Al 3+ 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 (Eu 3+ doped hexacelsian) spectroscopy's. The crystal structure (space group P6 3/ mcm) and microstructure (size-strain analysis) results indicate disorder distribution of the Si 4+ and Al 3+. Analysis of the spectra indicates disorder distribution of the Si 4+ and Al 3+ ( 29Si and 27Al MAS NMR spectroscopy), dynamical disorder in the structure and site symmetry lowering for the Ba 2+ site at a low temperature (Raman and luminescence spectroscopy's).