Na 2O·xAl 2O 3 (x = 9, 11) films have been obtained by sol-gel method. Crystallization processes during heat treatments have been investigated by X-ray diffraction analysis. A metastable phase with the mullite structure, λ-Na 2O·xAl 2O 3, has been observed starting from 800°C. Films remained stable after a heat treatment at 1000°C for 250 h. Impedance spectroscopy measurements showed that the films of λ-Na 2O·xAl 2O 3 possess a large three-dimensional ionic conductivity at 400°C.
|Original language||English (US)|
|Number of pages||4|
|Journal||Journal of the American Ceramic Society|
|State||Published - Nov 2003|
ASJC Scopus subject areas
- Ceramics and Composites
- Materials Chemistry