Figure 3

(a) HRTEM image of a double-core IONF. The outer boundaries of the individual cores and their interface are indicated by a solid line and by a dashed line, respectively. Panels (b) and (c) show local FFTs of the cores labeled A and B in (a), respectively. In panel (b), reflections associated with the ordering of vacancies are marked by arrows. (d) Filtered inverse FFT showing the \((2\,2\,0)\) lattice fringes from the region in the middle of panel (a) that is marked by a square. (e) Strain field component perpendicular to the \((2\,2\,0)\) lattice planes of the cores as determined by GPA.