Thermal segregation experiments were performed on open and encapsulated wafers of Fe(Fe1.51Al0.49)O4 spinels using CO2 laser radiation as a heat source. The correlation of “apparent” marker movement and cation segregation led to the conclusion that the free exchange of gaseous oxygen at the external spinel surfaces is necessary to cause significant redistribution of aluminum and iron in a temperature gradient. This was explained by the different mobilities of different cations in a net vacancy (low. Effectively no segregation was observed for the zero vacancy flux condition.
|Original language||English (US)|
|Number of pages||7|
|Journal||Journal of the American Ceramic Society|
|State||Published - Oct 1981|
ASJC Scopus subject areas
- Ceramics and Composites
- Materials Chemistry