Fig. 1
From: Structure and electrochromism of two-dimensional octahedral molecular sieve h’-WO3
Structure and nanostructure of the h’-WO3 framework. The study has been performed on the bronze recovered directly after aqueous synthesis. a SEM and b HRTEM images showing nanosized platelets. The inset in (b) shows a typical hexagonal SAED pattern. c HAADF-STEM and d corresponding ABF-STEM micrographs showing the arrangement of tungsten octahedra (blue, in inset of (c)). e Rietveld refined powder XRD pattern (Cu Kα). Projections of the structure along the (f) c axis and (g) the [110] direction. Bottom of (g) shows the structure with depth fading to highlight square channels along the [110] direction. The inset in (d) shows contrast variations along the yellow line. Each large increase in intensity corresponds to each numbered (WO6)6 tunnel along the line. Black arrows show depressions of intensity in each tunnel, highlighting inserted cations
