Abstract
Aluminium nitride powders were synthesized by the gas-phase reaction of AlCl3-NH3-N2 system. The yield of AlN powders from AlCl3 and their crystallinity increased as the reaction temperature and the mole ratio of NH3/AlCl3 were increased. AlN powders were also formed outside the reactor and their crystallinity was amorphous. The yield of AlN powders was as high as 80% when the reactor temperature was 1000 °C and the mole ratio of NH3/AlCl3 was 8. Most of the HCl by-product was recovered as NH4Cl outside the reactor. Powder characteristics, such as shape, size distribution and crystallinity, were also studied.
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