Strontium and calcium pyroniobates were prepared by a sol–gel process, using strontium/calcium metal and niobium ethoxide as precursors. The formation of Sr2Nb2O7 occurred at 750°C via an intermediate perovskite phase of composition close to Sr0.82NbO3. The crystallization of Ca2Nb2O7 occurred at 600°C directly without any intermediate phases. Sintered Sr2Nb2O7 and Ca2Nb2O7 pellets showed a preferred grain orientation. Microstructural studies revealed an increase in grain growth and associated orientation with sintering temperature.
|Original language||English (US)|
|Number of pages||5|
|Journal||Journal of the American Ceramic Society|
|State||Published - Oct 1992|
All Science Journal Classification (ASJC) codes
- Ceramics and Composites
- Materials Chemistry