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Electron diffraction and high resolution microscopy have been performed on Mg 1-x Al x B 2 with x 0.5. This composition displays a superstructure with a repeat period of exactly 2c along the c-axis and about 10 nm in the a-b plane. The superstructure results in ring-shaped superreflections in the diffraction pattern. Irradiation by a strong electron beam results...
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