Abstract
The ferroelectric phase transition behavior in BaTiO3 was investigated for various annealing times, temperatures, and Ba/Ti ratios by means of a differential scanning calorimeter. Coupling these observations with powder X-ray diffraction and transmission electron microscopy allowed new insights into the barium oxide (BaO)-titanium dioxide (TiO2) phase diagram. The transition temperature was varied systematically with the Ba/Ti ratio at annealing temperatures from 1200° to 1400°C in air. The transition temperature decreased with increasing concentrations of BaO and TiO2 partial Schottky defects, and showed a discontinuous change at the phase boundaries. Beyond the solubility region, two peritectoid reactions were confirmed and revised; first around 1150°C for Ba1.054Ti0.946O2.946→Ba2TiO4+BaTiO3 and second 1250°C for BaTi2O5→Ba6Ti17O40+BaTiO3, respectively. All other regimes of the BaO-TiO2 were found to be consistent with the reported diagrams in the literature.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 2589-2594 |
| Number of pages | 6 |
| Journal | Journal of the American Ceramic Society |
| Volume | 90 |
| Issue number | 8 |
| DOIs | |
| State | Published - Aug 2007 |
All Science Journal Classification (ASJC) codes
- Ceramics and Composites
- Materials Chemistry
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