Fig. 3
From: Maximizing sinusoidal channels of HZSM-5 for high shape-selectivity to p-xylene
Structural details of HZSM-5_T crystal. a SEM images of HZSM-5_T crystals showing a highly intergrowth morphology, with the front facet of each main crystal covered by corresponding intergrowth twin crystal. b A thin cross-section cut from the central part of this crystal (marked with a red rectangle) was fabricated by FIB. c TEM side view of the lamella taken from b. The lamella contains three domains that are separated by two boundaries partially highlighted by yellow dashed lines. The areas from area ① to ⑤ were selected for SAED. d–h show SAED patterns correspond to areas in c from ① to ⑤, respectively. Based on the unit cell parameters and Pnma symmetry, the main indexes are marked in yellow and red for different twin domains. i The deduced twinning model of HZSM-5 crystals, where the two twin components, marked in blue and purple, differ in their crystallographic orientation by 90° rotation over the common c-axis
