High-Resolution Transmission Electron Microscopy (HRTEM) and X-ray Diffraction (XRD) Study of the Intergrowth in Zeolites ITQ-13/ITQ-34

Selected area electron diffraction and high-resolution electron microscopy have been used to fully characterize ITQ-13 and ITQ-34. ITQ-13 is made up by a stacking sequence of AAAA... layers along the a-axis, while the stacking sequence is ABAB... for ITQ-34. These polytypes can intergrow to crystallize as new materials with different concentrations of each polytype as observed by X-ray powder diffraction. High-resolution images show that in all compositional range both materials intergrow in a disordered sequence along the a direction of the ITQ-13.