Synthesis of Nanocrystalline Aluminum Nitride by Nitridation of δ-Al2O3 Nanoparticles in Flowing Ammonia |
| |
Authors: | Qinghong Zhang Lian Gao |
| |
Affiliation: | State Key Lab of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China |
| |
Abstract: | Nanocrystalline aluminum nitride (AlN) with surface area more than 30 m2/g was synthesized by nitridation of nanosized δ-Al2O3 particles using NH3 as a reacting gas. The resulting powders were characterized by CHN elemental analysis, X-ray diffraction (XRD), Fourier transform infrared spectra, X-ray photoelectron spectra, field-emission scanning electron microscopy, transmission electron microscopy, and Brunauer–Emmett–Teller surface area techniques. It was found that nanocrystalline δ-Al2O3 was converted into AlN completely (by XRD) at 1350°–1400°C within 5.0 h in a single-step synthesis process. The complete nitridation of nanosized alumina at relatively lower temperatures was attributed to the lack of coarsening of the initial δ-Al2O3 powder. The effect of precursor powder types on the conversion was also investigated, and it was found that α-Al2O3 was hard to convert to AlN under the same conditions. |
| |
Keywords: | |
|
|