Premium
Modified Phase Diagram for the Barium Oxide–Titanium Dioxide System for the Ferroelectric Barium Titanate
Author(s) -
Lee Soonil,
Randall Clive A.,
Liu ZiKui
Publication year - 2007
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2007.01794.x
Subject(s) - materials science , phase diagram , barium titanate , ferroelectricity , analytical chemistry (journal) , annealing (glass) , phase transition , titanium dioxide , barium , titanium , titanate , transition temperature , barium oxide , mineralogy , oxide , phase (matter) , metallurgy , ceramic , chemistry , condensed matter physics , dielectric , superconductivity , physics , optoelectronics , organic chemistry , chromatography
The ferroelectric phase transition behavior in BaTiO 3 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 (TiO 2 ) 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 TiO 2 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 Ba 1.054 Ti 0.946 O 2.946 →Ba 2 TiO 4 +BaTiO 3 and second 1250°C for BaTi 2 O 5 →Ba 6 Ti 17 O 40 +BaTiO 3 , respectively. All other regimes of the BaO–TiO 2 were found to be consistent with the reported diagrams in the literature.