The Influence of the Synthesis Method on the Characteristics of BaTiO[sub.3]

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 °C, 800 °C and 1000 °C....

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Bibliographic Details
Published in:Materials 2023-04, Vol.16 (8)
Main Authors: Almeida, G. N, de Souza, R. N, Lima, L. F. S, Mohallem, N. D. S, da Silva, E. P, Silva, A. M. A
Format: Article
Language:English
Subjects:
Analysis
Ceramic materials
Ceramics
Dielectrics
Methods
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Summary: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 °C, 800 °C and 1000 °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 BaTiO[sub.3] 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 BaCO[sub.3] 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).
ISSN:1996-1944
1996-1944
DOI:10.3390/ma16083031