Characterization of Aluminum Nitride from a Precursor Poly (isopropyliminoalane)

Abstract

Aluminum nitride (AlN) was prepared by pyrolysis of poly (isopropyliminoalane) under Ar and NH₃/N₂ atmospheres. X-ray powder diffraction analysis revealed that the only crystalline phase was AlN, whose lattice constants showed that possible amounts of carbon and oxygen in the lattice should be very small. Chemical analyses showed the presence of carbon only in the product pyrolyzed in Ar; almost all carbon was removed by pyrolysis in NH₃/N₂. The ceramic yield for two-step pyrolysis in Ar (1000°C for 2h, 1600°C for 2h) was 32%, while that for pyrolysis in NH₃/N₂ (600°C for 2h in NH₃, 1350°C for 8h in N₂) was 47%.