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A single phase of delafossite CuAlO 2 (CAO) was successfully synthesized by a 600 W microwave radiation for 20 min. The CAO sample was composed of quite distorted single-crystalline plates with 200–350 nm thick. Its atomic vibrations were detected at 760 and 550 cm −1 belonging to Al–O and Cu–O stretching, respectively. The direct and indirect energy gaps were respectively determined...
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