Thermal Decomposition Process of Barium Titanyl Oxalate Tetrahydrate.

Abstract

Thermal decomposition of barium titanyl oxalate tetrahydrate was investigated in air and nitrogen atmospheres, respectively. Decomposition process is divided into four steps; dehydration, decomposion, crystallization and the production of BaTiO3. In air atmosphere, after dehydration and the decomposition of barium titanyl oxalate, a small amount of BaCO3 and TiO2 is formed through the reaction between the decomposition product and the generated CO2 gas in air atmosphere, while the other large part of the decomposition product crystallizes out as intermediate phase (Ba2Ti2O5CO3) in intermediate process of decomposition. In nitrogen atmosphere, however, BaTiO3 is only formed through decomposition of intermediate phase.