Fig. 6
Electron beam-induced grain rotation of a single Co3O4 grain. The sample is prepared by surfactant-assisted solvothermal growth. The mid-voltage range electron beam acceleration is 80 kV. a–c show successively recorded phase images with dose rates and total doses as indicated. A, B, C highlight the presence of different crystal structures. It is seen that the [211] crystal orientation exhibit two distinctly different patterns A, B. A is an unknown atom configuration and B can be modeled by the expected atom configuration of a [211] oriented spinel Co3O4 grain as shown by the inset in Fig. 1a). C is the expected [321] pattern of the spinel Co3O4 as confirmed by the depicted image simulation, too. The local nano-diffraction patterns of the reconstructed wave functions are shown below, together with matched, calculated kinematic diffraction patterns that are used to identify the listed zone axes orientations. Black arrows point to specific diffraction spots that dominate in the [211] zone axis orientation but remain visible even in the [321] crystal orientation. On top, the standard stereographic projection of fcc crystal structure shows the suggested grain rotation of 10.9°