Mirror symmetry, no symmetry and glide symmetry of crystals are displayed using interference (lattice) fringes appearing in overlapping disks of convergent-beam electron diffraction (CBED) patterns. The lattice fringes with a spacing of 2.7 Å of the 200 reflection of FeS2 have been observed in coherent CBED patterns with use of a JEM2010F electron microscope equipped with a field-emission gun. Two-dimensional interference fringes are shown in three overlapping disks taken from FeS2 at  electron incidence. It is demonstrated that such lattice fringes can be obtained even by an LaB6 electron source when using imaging plates.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Atomic and Molecular Physics, and Optics