Formation of BaTiO3 from BaCO3 and TiO2 in Air and in CO2 |
| |
Authors: | LIESELOTTE K TEMPLETON JOSEPH A PASK |
| |
Affiliation: | Ceramics Laboratory, Department of Mineral Technology, University of California, Berkeley, California |
| |
Abstract: | The formation of BaTiO3 from equimolar BaCO3 and TiO2 (rutile) mixtures was studied in air and in CO2. A small amount of BaTiO3 is formed first directly from BaCO3 and TiO2 at the surface of contact. From then on it is a diffusion-controlled reaction, and both BaTiO3 and Ba2TiO4 are produced, with Ba2TiO4 being formed in much larger amounts. In 1 atmosphere of CO2, the intermediate Ba2TiO4 was suppressed up to a temperature of about 1100°C. in agreement with thermodynamic calculations. Ba2TiO4 reacts fast with 1 atmosphere of CO2 below about 1100°C. to produce BaTiO3and BaCO3 |
| |
Keywords: | |
|
|