Synthesis of AlN – presence and absence of additive; pp. 239–249

Direct nitridation of hexagonal aluminium nitride (AlN), using additive like NH4Cl, was performed from Al metal powder. Different methods of AlN synthesis, viz. a) Al powder, b) Al and NH4Cl, c) Al and NH4Cl with urea, were carried out in continuous flowing of N2 gas at 900 °C for 5 h. The synthesized powder was characterized by employing TGA/DTA, XRD, FTIR, SEM, UV-VIS Spectroscopy and CHNS analysis. The mechanism for the formation of AlN by the influence of additive and role of urea are discussed.