Heating rate and temperature effects on the BaTiO3 formation by thermal descomposition of (Ba, Ti) organic precursors during the pechini process

LEANDRO ALFREDO RAMAJO; RODRIGO PARRA; MARÍA MARTA REBOREDO; MARÍA APARECIDA ZAGHETE; MIRIAM SUSANA CASTRO

MATERIALS CHEMISTRY AND PHYSICS

Elsevier Science Ltd.

Año: 2008 vol. 107 p. 110 - 114

0254-0584

Different thermal treatments for the synthesis of BaTiO3 powder obtained through the Pechini method were studied. The synthesis of BaTiO3 starts at 150ºC by the thermal dehydration of organic precursors. The usual inevitable formation of barium carbonate during the thermal decomposition of the precursor could be retarded at lower calcination temperatures and optimized heating rates. The organic precursors were treated at temperatures between 200 and 400ºC. Then, the samples were calcined at 700 and 800ºC for 4 and 2h, respectively. The resulting ceramic powders were characterized by gravimetric and differential thermal analyses, X-ray powder diffraction and infrared spectroscopy. It was found that depending on the heating rate and final temperature of the thermal treatment, high amounts of BaCO3 and TiO2 could be present due to the high concentration of organics in the final calcination step.