About this Abstract |
| Meeting |
2027 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in Ceramic Materials and Processing
|
| Presentation Title |
Frequency Dependence of the Dielectric Response in La3+/Bi3+ Co-Doped BaTiO3 Ceramics |
| Author(s) |
M. I. Valenzuela-Carrillo, M. Pérez-Labra , I. Mendoza-Sánchez , J. A. Palmas-León, J. A. Romero-Serrano, M. Reyes-Pérez, A. Hernández-Ramírez |
| On-Site Speaker (Planned) |
M. I. Valenzuela-Carrillo |
| Abstract Scope |
Pure and La3+/Bi3+ co-doped BaTiO3 ceramics were synthesized by ball milling and heat treatment, with dopant concentrations of x = 0.0, 0.002, 0.0045, and 0.05. X-ray diffraction and Rietveld refinement confirmed a tetragonal ferroelectric phase for the low-doped compositions and a cubic structure with a BaBiO3 secondary phase beyond the solubility limit. The dielectric response was evaluated versus temperature and frequency at 1 kHz, 10 kHz, and 100 kHz. Unlike previous single-frequency studies, this work analyzes how frequency affects the permittivity and the apparent Curie temperature. For all compositions, the dielectric constant decreased as frequency increased, a behavior associated with dipolar and interfacial relaxation. Low-doped samples showed a permittivity peak higher than undoped BaTiO3, the highest for x = 0.002. In contrast, x = 0.05 showed a reduced, nearly temperature-independent permittivity related to the paraelectric cubic phase. These results confirm that co-doped BaTiO3 dielectric behavior depends strongly on frequency. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Ceramics, Characterization, Powder Materials |