Nanostructured Al2O3 powders have been synthesized by combustion of aluminum powder in a microwave oxygen plasma, and characterized by X-ray diffraction and electron microscopy. The main phase is γ-Al2O3, with a small amount of δ-Al2O3. The particles are truncated octahedral in shape, with mean particle sizes of 21-24 nm. The effect of reaction chamber pressure on the phase composition and the particle size was studied. The γ-alumina content increases and the mean particle size decreases with decreasing pressure. No α-Al2O3 appears in the final particles. Electron microscopy studies find that a particle may contain more than one phase.
|Original language||English (US)|
|Number of pages||3|
|Journal||Journal of the American Ceramic Society|
|State||Published - Sep 2003|
ASJC Scopus subject areas
- Ceramics and Composites
- Materials Chemistry