Figure 2

The effect of temperature on AlN growth observed in three samples: a) SEM image of the hexagonal features grown at T_G=1820-1830°C, EDX of these features (AlN_xSiC_y ); b) AlN single crystal growth at T_G=1870-1880°C; cracks due to thermal and mechanical stresses are evident; c) colorless and transparent AlN islands with flat c-faces grown at T_G=1920-1930°C.

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