Electrical‐conductivity and thermoelectric‐power measurements of magnetite and iron‐aluminate spinels at high temperatures confirm a small‐polaron model of electronic conduction. Electrical properties corroborate the previously established cation distribution and defect model. Iron cations become randomly distributed between sublattices at the highest temperature. An n‐to‐p transition therefore occurs at the 50%Fe3O4‐50%FeAl2O4 composition. Cation distribution and defect equilibria appear to be independent of composition.
|Original language||English (US)|
|Number of pages||6|
|Journal||Journal of the American Ceramic Society|
|State||Published - Apr 1981|
ASJC Scopus subject areas
- Ceramics and Composites
- Materials Chemistry