Two members of the ABC-D6R family of zeolites: zeolite phi and linde D

Abstract

Linde D and phi, members of the ABC-double six-ring (ABC-D6R) family of zeolites, have been studied by X-ray diffraction. Broadening of specific lines in the X-ray powder diffraction pattern is observed which is consistent with the existence of faulting within the crystals. Both X-ray powder diffraction patterns can be simulated by introducing double six-member-ring sheet structural faults into the AABBCC stacking sequence of chabazite. These zeolites can be synthesised from a potassium–sodium-containing gel system in the absence of organic amines.