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AlN single crystal platelets up to 2x3mm 2 and needles 1mm in diameter and 3mm in length were successfully grown by directly heating the source materials with microwaves. The process temperature was over 2000 o C and the pressure was kept constant at 910Torr. The growth rate was typically 300μmh -1 in the c-direction. An emission around 5.5eV was observed in the photoluminescence...