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Indian Journal of Pure & Applied Physics (IJPAP) >
IJPAP Vol.44 [2006] >
IJPAP Vol.44(08) [August 2006] >
| Title: | Mechanism of phase formation of BaTiO3-SrTiO3 solid solution through solid – oxide reaction |
| Authors: | Rout, S K
Panigrahi, S |
| Keywords: | Perovskite
Phase formation kinetics
BaTiO3-SrTiO3
Solid solution |
| Issue Date: | Aug-2006 |
| Publisher: | CSIR |
| IPC Code: | B01D9/00 |
| Abstract: | The formation of solid solution composition Ba0.5Sr0.5TiO3,
from BaCO3, SrCO3 and TiO2 powders has been
studied through solid oxide reactions using TGA/DSC and XRD. The compound BaCO3
decomposes at much lower temperature in the mixture due to the presence of
acidic TiO2. BaTiO3 (BT) and SrTiO3 (ST) which
start forming from the temperatures 700 and 800°C, respectively without
formation of BaO/SrO or any titanate phases. Rietveld refinement shows the rate
of formation of BT is relatively higher than that of ST. The solid solution Ba0.5Sr0.5TiO3
(BST (ss)) starts forming from 1000°C. The rate of formation of BaTiO3 is higher
than that of SrTiO3. Activation energy for formation of BaTiO3
(40.41 kcal/mol) is higher than that of SrTiO3 (58.867 kcal/mol) in
the system. Lattice parameter of initial solid solution phase is higher
indicating that the BST forms with the interface of BT. The final BST (ss)
formation requires more activation energy (76.999 kcal/mol) than initial BT and
ST. |
| Page(s): | 606-611 |
| ISSN: | 0975-1041 (Online); 0019-5596 (Print) |
| Source: | IJPAP Vol.44(08) [August 2006]
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