| About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
|
Engineering Ceramics: Microstructure-Property-Performance Relations and Applications
|
| Presentation Title |
Enhanced Spontaneous Ferroelectric Polarization in Sm-Doped BaFe0.2Ti0.8O3 Ceramics |
| Author(s) |
Anumeet Kaur, Arkaprava Das |
| On-Site Speaker (Planned) |
Anumeet Kaur |
| Abstract Scope |
We investigate the origin of progressive spontaneous polarization enhancement at room temperature (RT) in Ba1-xSmxTi0.8Fe0.2O3 (BTO) solid solution (x = 0, 0.10, 0.15, 0.20) with increasing Sm doping. XRD and Raman spectroscopic results confirm A (SmBa) and B (FeTi) site cationic substitution and increase in tetragonality. The cooperative off-centering phenomena promote interpolar clustering via nucleation causing an enhancement in remnant polarization and coercive field with increasing Sm doping. Microscopic observation has indicated the presence of multivariant ferroelectric domain fringes along with more compact and larger grain distribution at the highest Sm concentration. The continuous reduction in oxygen vacancy density observed from X-ray photoelectron spectroscopy results in domain wall depinning and easier domain switching. The X-ray absorption spectra for Ti L3,2 shows the increase of t_2g/e_g ratio indicating enhanced Ti 3d– O 2p orbital hybridization. In-depth understanding permits us to tune the controlling parameters in optimizing the ferroelectric ordering at RT. |