Fig. 3: Structural relaxation of DDR-type zeolite during TMCT treatment.
From: Control of zeolite framework flexibility for ultra-selective carbon dioxide separation
a SEM image of DDR-type zeolite crystal. b Rotation of silica tetrahedra during TMCT procedure, transferring the space group from R-3m to R-3. The silicon and oxygen atoms are highlighted in blue and red color to demonstrate the structure relaxation. Fresh, as-synthesized zeolite; TMCT, overheating at 700 °C for 1 min.
