| About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
|
Advances in Dielectric Materials and Electronic Devices
|
| Presentation Title |
D-1: Analysis of the Electrical Conduction Mechanisms of La-Doped AgNbO3 Ferroelectric Ceramics |
| Author(s) |
Tawan H. T. Rosa, Ruyan Guo, Amar S. Bhalla, José de los Santos Guerra |
| On-Site Speaker (Planned) |
Tawan H. T. Rosa |
| Abstract Scope |
AgNbO3-based ferroelectric ceramics were synthesized by the conventional solid-state reaction method, revealing a single perovskite phase with no undesirable secondary phases for all compositions. The Johnscher's Universal Power Law has been used to investigate the electrical conductivity in both ferroelectric and paraelectric phases for the studied compositions. The obtained values for the power law exponent suggest that the conduction mechanism in both phases is associated with a localized hopping motion. Furthermore, at low temperatures, the temperature-dependent exponent showed that the Small Polaron Hopping (SPH) model is appropriate for the AC conduction mechanism in the lanthanum-doped samples. On the other hand, the activation energy values revealed different conduction mechanisms for the analyzed regions, where the oxygen vacancies play an important role at higher temperatures. ACKNOWLEDGMENTS: The authors thank to CNPq (309494/2022-2 and 408662/2023-9), FAPEMIG (APQ-02875-18) and CAPES (Finance Code 001) for the financial support. |