About this Abstract |
| Meeting |
2027 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in Ceramic Materials and Processing
|
| Presentation Title |
Effect of secondary phase formation induced by high Ho3+ concentrations on the structural, microstructural, and dielectric properties of BaTiO3 |
| Author(s) |
I. Mendoza-Sánchez, M. Perez-Labra, J. A. Romero-Serrano , M.I. Valenzuela-Carrillo , M. Reyes-Pérez , M.U. Flores, A. Cruz-Ramírez, V.E. Reyes-Cruz |
| On-Site Speaker (Planned) |
I. Mendoza-Sánchez |
| Abstract Scope |
Holmium-doped barium titanate, Ba1-xHoxTi1-x/4O3 (x = 0.0, 0.15, and 0.25), was synthesized by the conventional solid-state reaction method followed by sintering. The ceramics were characterized by X-ray diffraction (XRD), high-resolution scanning electron microscopy coupled with energy-dispersive spectroscopy (HRSEM-EDS), and dielectric measurements. XRD results confirmed tetragonal BaTiO3 as the main phase, while secondary Ho2Ti2O7 pyrochlore-type and Ho2TiO5 phases appeared at higher Ho3+ contents, indicating limited dopant incorporation. HRSEM analysis revealed a reduction in particle size with increasing holmium concentration, whereas EDS showed a Ba/Ti ratio below unity, suggesting a non-stoichiometric composition. Dielectric measurements at 1 kHz between 50 and 200 °C showed a marked decrease in the dielectric constant from 8512 to 2504 as Ho3+ content increased. Conversely, the Curie temperature shifted from 120 to 128 °C, likely due to structural distortions and the formation of secondary phases. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Other, Other, Other |