The Influence of the Synthesis Method on the Characteristics of BaTiO3

In this work, barium titanate powders were produced by sol-gel and sol-precipitation methods from metal alkoxides. In the sol-gel method, tetraisopropyl orthotitanate was mixed with 2-propanol, acetic acid and barium acetate, and the gel samples obtained were calcined at 600 degrees C, 800 degrees C and 1000 degrees C. Through the sol-precipitation method, tetraisopropyl orthotitanate was mixed with acetic acid and deionized water and precipitated by the addition of a concentrated solution of KOH. The products were calcined at various temperatures, and the microstructural and dielectric properties of the BaTiO3 prepared for the two processes were analyzed and compared. The results of these analyses allowed us to observe an increase in the tetragonal phase and the dielectric constant (15-50 at 20 kHz) with increasing temperatures in the samples produced by the sol-gel method, while the sample obtained by sol precipitation was cubic. The presence of BaCO3 is more evident in the sample produced by sol-precipitation, and the band gap of the products obtained did not show significant variation, changing the synthesis method (3.363-3.594 eV).

Automated summary

In this study, barium titanate powders were synthesized using sol-gel and sol-precipitation methods. The microstructural and dielectric properties of the samples prepared by both methods were compared. The sol-gel derived samples exhibited an increase in the tetragonal phase and dielectric constant with increasing temperatures, while the sol-precipitation derived sample was cubic. The presence of BaCO3 was more evident in the sol-precipitation derived sample, and the band gap of the products did not show significant variation with the synthesis method.