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Structural instability of single wall carbon nanotube under electron beam irradiation was investigated by our developed in-situ transmission electron microscopy observation technique. It was observed that the nanotube shrunk and necked in diameter gradually and the curved nanotube shrunk faster in axis direction than straight one with increasing of electron dose during the irradiation. Such athermally...
GaN epilayers grown on pre-nitridated (0001) sapphire substrates by metallorganic vapor phase epitaxy were investigated by wavelength dispersive X-ray spectroscopy and energy dispersive X-ray spectroscopy. Precipitates were observed to mainly consist of O impurity whose strengths were weaker than surrounding matrix. The precipitates were larger in size and distributed more sparsely and inhomogeneously...
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