Synthesis of monodispersed nanophase α-Fe2O3 (hematite) powder to be used as a red pigment in porcelains was investigated using microwave-hydrothermal and conventional-hydrothermal reactions using 0.018M FeCl3·6H2O and 0.01M HCl solutions at 100°-160°C. Acicular and yellow β-FeOOH (akaganite) particles 300 nm in length and 40 nm in thickness were dominantly formed at 100°C after 2-3 h, while spherical α-Fe2O3 particles 100-180 nm in diameter were preferentially formed after 13 h using a conventional-hydrothermal reaction. However, a microwave-hydrothermal reaction at 100°C led to monodispersed and red α-Fe2O3 particles 30-66 nm in diameter after 2 h without the formation of β-FeOOH particles. In this paper, the effect of microwave radiation during hydrothermal treatment at 100°-160°C on the formation yield, kinetics, morphology, phase type, and color of α-Fe2O3 was investigated.
|Original language||English (US)|
|Number of pages||5|
|Journal||Journal of the American Ceramic Society|
|State||Published - Oct 1 2001|
All Science Journal Classification (ASJC) codes
- Ceramics and Composites
- Materials Chemistry