Fig. 8.

(a) HRTEM images of the M phase taken in orientations corresponding to $[11\overline{2}0]$ (upper micrograph) and $[1\overline{1}00]$ (lower micrograph) zone axes of the hexagonal Ba(Ti,Fe)O₃ layer. On the background the yellow and pink stripes correspond to P (perovskite) and H-type (magnetite) slabs, respectively. (b) Composional maps of the M phase (in $[11\overline{2}0]$ zone axis orientaion) obtained with Ti L_2,3, Ba M_4,5, and Fe L_2,3 edges. The maps show the Ti composition is relatively uniform throughout the crystals whereas the Fe elemental distribution reveals an enhancement corresponding to the H slabs. Similarly, the Ba distribution is decreased in the H slabs relative to the P slabs. (c) A schematic drawing of a reciprocal lattice of the compounds showing the typical rods of continuous intensity in the c-direction. (d) The image obtained by inverse FFT shows only the H slabs. Rectangles correspond to a characteristic structural element of the H slab and emphasize random shift of the H slabs.