High-resolution electron microscopy shows the coexistence of several distinct core structures for coincident-site lattice boundaries in NiO bicrystals near =5,(310), and =13,(510), where is the reciprocal density of coincident lattice sites. Lattice expansion perpendicular to the =5 grain boundaries is considerably smaller than calculated theoretically. Structural units in boundaries near =13,(510) exhibit translations normal to the grain-boundary plane, resulting in a rumpling of the interface on an atomic scale. Our observations suggest the presence of a high concentration of Schottky pairs in the grain boundaries.
ASJC Scopus subject areas
- Physics and Astronomy(all)