About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Phase Stability, Phase Transformations, and Reactive Phase Formation in Electronic Materials XXV
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| Presentation Title |
Polar Nanoregion Fluctuations and Phasons in Strong Pockels Material Strontium Barium Niobate |
| Author(s) |
Michael E. Manley, Daniel P Phelan, Bixia Wang, Songxue E. Chi, Douglas L Abernathy, Matthew S Bryan, Raphael P Hermann |
| On-Site Speaker (Planned) |
Michael E. Manley |
| Abstract Scope |
Relaxor ferroelectrics display broad diffuse phase transitions, polar nanoregions (PNRs), and exhibit enhanced properties that make them suitable for a wide range of applications including optoelectronic switches and piezoelectric actuators. Some of these enhanced properties have been attributed to interplay between PNR fluctuations and phonons. However, the promising lead-free uniaxial relaxor ferroelectric strontium barium niobate, SrxBa1-xNb2O6 (SBNx) (x>0.6), exhibits an incommensurate modulation that introduces phasons and amplitudons in addition to phonons. Considerable debate remains as to the relationship between the incommensurability and relaxor ferroelectric behavior. To more fully characterize the transition inelastic neutron scattering measurements of the phonons, phasons, and PNR quasielastic diffuse scattering were performed on SBN61. The phason intensity reaches a maximum on cooling ahead of the incommensurate transition and this corresponds to a maximum in the quasielastic width of the PNR diffuse scattering – revealing a strong influence of phasons on PNRs and hence relaxor ferroelectric behavior. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Electronic Materials, Characterization, Phase Transformations |