6 nm crystalline A1N has been synthesized through a simple reaction between
commercial Al and NH4Cl in an autoclave at 580 degrees C which is much low
er than those of traditional methods. X-ray diffraction result indicates th
e formation of hexagonal A1N nanocrystallites. Transmission electron micros
copy image shows that the average size of the crystallites is 6 nm. The pos
sible synthetic mechanism of A1N is proposed.