Temperature-induced structural transformations of layered titanosilicate JDF-L1

Abstract

Layered titanosilicate JDF-L1 is synthesised in a Na 2O:TiO 2:SiO 2:H 2O system applying a rapid procedure and without using organic additives in the synthesis mixture. The thermal evolution of the JDF-L1 structure is studied by thermogravimetric-differential thermal analysis, powder X-ray diffraction and Raman spectroscopy. It is shown that on heating JDF-L1 undergoes a sequence of structural rearrangements causing formation of noncrystalline alkali titanate–titanosilicate phases, defect-rich microcrystalline silica and crystalline titanosilicate narsarsukite, the latter becoming the dominant phase at high temperatures.