Synthesis of Aluminium Nitride by Spark Discharge Method in Liquid Ammonia

Abstract

Aluminium nitride poWders were synthesized by the spark discharge method in liquid ammonia at 0-130 °C and 2.5-11 kV of the spark discharge voltage using aluminium pellets as starting material. The crystallite size and the grain size of MN were 29-43 nm and 4.5-8.7 μm, respectively. Significant amount of Al coexisted with AlN. The content of A1N increased with decreasing the size of aluminium pellet and with rising the temperature of liquid ammonia. By calcining the powder in nitrogen atmosphere at 900-1200 °C Al coexisted with AlN could be converted to AlN without coagulation of the powder.