About this Abstract |
| Meeting |
MS&T25: Materials Science & Technology
|
| Symposium
|
Advances in Dielectric Materials and Electronic Devices
|
| Presentation Title |
Enhancement of spontaneous ferroelectric polarization in Sm-doped BaFe0.2Ti0.8O3 ceramics |
| Author(s) |
Anumeet Kaur |
| On-Site Speaker (Planned) |
Anumeet Kaur |
| Abstract Scope |
We investigate the origin of systematic enhancement of spontaneous polarization upto ~ 8 times at room temperature in Ba1-xSmxFe0.2Ti0.8O3 (BTO) solid solution (x = 0, 0.10, 0.15, 0.20). The cooperative off-centering phenomenon due to octahedral distortion promotes interpolar clustering resulting in the formation of polar nano region causing an enhancement in remnant polarization and coercive field with Sm doping. Microscopic observation has indicated the presence of multivariant ferroelectric domain for the highest Sm doped compounds. 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 edges show the increase of t_2g/e_g ratio indicating enhanced Ti 3d– O 2p orbital hybridization. The first-principles density functional theory calculation also indicates that doping-induced increment in Ti 3d/Sm 4d-O 2p orbital hybridization which weakens the short-range repulsion between core orbitals and facilitates the enhancement of ferroelectricity. |