About this Abstract |
| Meeting |
MS&T25: Materials Science & Technology
|
| Symposium
|
Advances in Dielectric Materials and Electronic Devices
|
| Presentation Title |
Investigation of the dielectric relaxation processes in donor-doped BaTiO3-based ceramics |
| Author(s) |
Tawan H. T. Rosa, Marco Aurélio de Oliveira, Yanela Mendez González, Fidel Guerrero Zayas, Ruyan Guo, Amar S. Bhalla, José de los Santos Guerra |
| On-Site Speaker (Planned) |
Tawan H. T. Rosa |
| Abstract Scope |
In this work, Ba1-xGdxTiO3 ferroelectric ceramics (x = 0.001–0.005) were synthesized via the Pechini’s chemical method to investigate the influence of the conduction mechanisms on the dielectric response. The structural properties, investigated from the X-ray diffraction technique, confirmed the formation of a single-phase tetragonal perovskite (P4mm) without any undesirable secondary phase. The dielectric response revealed strong dispersion effects, which were analyzed using the Davidson-Cole’s formalism. The results revealed a polaron-assisted relaxation process, showing activation energy values decreasing from 0.29 up to 0.21 eV with the increase of the Gd content. On the other hand, the electrical conductivity analysis, performed by using the Jonscher’s universal power-law, confirmed the decisive role of the small polaron hopping (SPH) charge transport for the conduction mechanism. |