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Structural evolution of GaN under electron-beam-irradiation at a flux of . [(a) and (d)] 0 s, [(b) and (e)] 900 s, and [(c) and (f)] 1800 s.
(a) High-resolution TEM image of the damaged region and its Fourier power spectrum. The electron beam is incident along the direction. [(b) and (c)] Electron diffraction patterns obtained from the different crystal orientation. The patterns are indexed in terms of the original wurtzite structure.
Electron energy-loss spectra for N -edge of the unirradiated and irradiated GaN.
Simulated electron diffraction patterns for the proposed structure of the ordered crystalline phase. Beam orientations are given by (a) , (b) , and (c) .
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