Figure 1

(a) An energy-filtered dark filed image and (b) a reduced interference function $Qi\left(Q\right)$ profile obtained from the specimen annealed at 873K for 1 h. The dark-field image was taken by using a part of the first halo ring and the enlarged image is also shown in the inset of (a). A SAED pattern used in making the $Qi\left(Q\right)$ profile is also shown in the inset of (b).Reuse & Permissions

Figure 2

Two types of NBED patterns, (a) perfect ${\text{Fe}}_{23}{\text{B}}_6$ and (b) ${\text{Fe}}_{23}{\text{B}}_6$-like patterns, obtained from the specimen annealed at 873K for 1 h. The electron incidence is parallel to the [110] direction of the ${\text{Fe}}_{23}{\text{B}}_6$ structure. The simulated diffraction pattern is also shown in $\left({\text{a}}^{\prime }\right)$. For comparison, the surrounded areas in the patterns of (a) and (b) are enlarged in (c), (d), $\left({\text{c}}^{\prime }\right)$, and $\left({\text{d}}^{\prime }\right)$, respectively.Reuse & Permissions

Figure 3

Pseudotenfold NBED pattern obtained from the specimen annealed at 873K for 1 h. To visualize weak spots in the higher scattering angle region, a high contrasted NBED pattern is also shown in the right side.Reuse & Permissions

Figure 4

(Color online) (a) An [110] projection of the ${\text{Fe}}_{23}{\text{B}}_6$ structure. The larger and smaller circles denote the Fe and B atoms, respectively. The linkages between Fe atoms make a tiling with deformed decagonal units. (b) A deformed decagonal unit found in the ${\text{Fe}}_{23}{\text{B}}_6$ structure. $\left({\text{b}}^{\prime }\right)$ An exact decagonal unit obtained by slight atomic displacements into the deformed unit. (c) Three types of tiles found in the decagonal unit. (d) A preliminary structure model giving the pseudotenfold diffraction pattern, in which the there types of tiles as structural motifs of ${\text{Fe}}_{23}{\text{B}}_6$ are linked each other. A Fourier transform pattern obtained from the model is also shown in the inset. The Fourier transform pattern with ten strong spots is well consistent with the experimental obtained pattern of Fig. 3. Arrows in the model mean orientations of the structural motifs with five different directions, which contribute to give the isotropic diffraction pattern with ten strong spots.Reuse & Permissions