Mmj. Treacy et al., A HOLLOW-CONE DARK-FIELD STUDY OF INTERLAYER CRACKS IN DELAMINATED HCA2NAN-3NBNO3N+1 MATERIALS, Philosophical magazine. A. Physics of condensed matter. Defects and mechanical properties, 72(1), 1995, pp. 161-177
We investigate the blister features that appear in small-angle hollow-
cone dark-field images of overlapping layers of delaminated calcium ni
obate. Modelling shows that the blister contrasts are caused by pocket
s of gas or liquid that have become trapped when calcium niobate layer
s are brought into contact and reseal. Hollow-cone dark-field contrast
is primarily due to diffraction variations caused by sheet bending ar
ound the pressurized cracks.