Single step combustion synthesis to prepare La doped-Bi4Ti3O12 bulk ceramics and some its characterization

• Main Author: Al-Amani, Umar
• Format: Conference or Workshop Item
• Language: English; English
• Published: 2012
• Subjects: T Technology (General)
• Online Access: http://eprints.utem.edu.my/id/eprint/10074/1/AMEC_2012.pdf; http://eprints.utem.edu.my/id/eprint/10074/2/Poster_AMEC_8.tif; http://eprints.utem.edu.my/id/eprint/10074/

This paper describes the potential of combustion route to synthesize the as-burnt Bi4-xLaxTi3O12(BLaT) powders with different La content (x = 0.0, 0.25, 0.50 and 0.75) in a single step synthesis and subsequently, sintered at1000oC for 3 hour. The as-burnt powders were systematically characterized by XRD, Raman andFTIR analysis. In addition to that, the sintered samples were used to measure the electrical properties such as dielectric, conductivity, resistivity and ferroelectric. These measurements were performed at frequency ranging from 100 Hz to 1 MHz at room temperature. The grain microstructures were observed by SEM. Based on powder analysis, the XRD pattern confirmed the formation of a single BIT phase without presence any intermediate phase. The structural behaviour was also supported by Raman and FTIR analysis. This indicates that the combustion route is more convenient and economical in ceramic processing route. The electrical properties were greatly improved with higher La content in BLaT composition. In this particular work, the dielectric constant, dielectric loss, conductivity, resistivity, remanent polarization, coercive field of BLaT samples with x = 0.75 were recorded around 124 - 130, 0.0048 – 0.0197, 6.24 x 10 -9 – 5.42 x 10 -5 S/m, 1.60 x 10 8 – 1.84 x 10 4 Ω/m, 22.6 µC/cm2 and 86 kV/cm, respectively. In comparison to BIT samples, these results were 118 – 145, 0.0063 – 0.0873, 7.49 x 10 -8 – 9.84 x 10 -5 S/m, 1.33 x 10 7 – 1.02x10 4 Ω/m, 13.6 µC/cm2 and 52 kV/cm, respectively.