TY - JOUR
T1 - Modified phase diagram for the barium oxide-titanium dioxide system for the ferroelectric barium titanate
AU - Lee, Soonil
AU - Randall, Clive A.
AU - Liu, Zi Kui
PY - 2007/8
Y1 - 2007/8
N2 - 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.
AB - 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.
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U2 - 10.1111/j.1551-2916.2007.01794.x
DO - 10.1111/j.1551-2916.2007.01794.x
M3 - Article
AN - SCOPUS:34547651010
SN - 0002-7820
VL - 90
SP - 2589
EP - 2594
JO - Journal of the American Ceramic Society
JF - Journal of the American Ceramic Society
IS - 8
ER -