On the thermal decomposition of GaN in vacuum

The thermal decomposition of GaN was studied by means of a Mettler Thermoanalyzer while the gaseous products evolved were continuously pumped out. Some small loss of weight of GaN was observable already in the temperature range of 710 to 980°C but a definitive loss started only above 980°C. The gaseous decomposition products were analyzed also by means of a mass-spectrometer, Varian, coupled directly to a vacuum furnace. Only nitrogen was found. The temperature dependence of the decomposition was determined using the equilibrium pressure data of the dynamic system.