Preparation of AlN by direct nitridation at low temperature

Abstract

In order to lower synthesis temperature of AlN by direct nitridation method, Al powder was mixed with Li salt and heated at 500-1000°C in N₂ atmosphere. Mixing of Li salt was done by a mortar, and planetary ball-mill in N₂ atmosphere for 1h. For the Al powder added 1.9mol% LiOH·H₂O, the former and later samples ware nitrided at 630 and 580°C, respectively. These temperatures were lower than a melting point of Al.