Figure 2

Structural study of ED fibres.

(a) EDP taken from region II of Fig. 1a, showing a complex regular rectangular array of diffraction spots. (b) Simulated EDP of Fig. 2a produced by erionite fibres oriented along the [010] axis. (c) Simulated EDP of Fig. 2a produced by erionite fibres oriented along the [310] axis. (d) BF TEM image of fibres aggregates of the ED sample. Blue squares identify the investigated region I and II. Panel I: Magnified area of region I showing two overlapped fibrils of different width. The corresponding d-spacings of the visible lattice fringes are marked by white arrows. Panel Ia: Simulated image of the bright lattice fringes zone, marked by a white-dotted square in Panel I, of erionite as seen along the [010] axis. Sketch: Atomic representation of the erionite structure along the [010] axis. The AABAAC stacking sequence of planes of six-membered rings of (Si,Al)O₄ tetrahedra is also indicated. Panel Ib: Simulated image of the dark lattice fringes zone, marked with a white-dotted square in Panel I, of erionite as seen along the [010] axis. Panel II: Magnified area of region II showing a single fibril. The corresponding d-spacing of the visible lattice fringes is marked with a white arrow. Panel IIa: Simulated image of the bright lattice fringes zone of the nanometric area marked with a white-dotted square in region II as seen along the [010] axis.