About this Abstract |
Meeting |
2025 TMS Annual Meeting & Exhibition
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Symposium
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Neutron and X-ray Scattering in Materials Science and Engineering
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Presentation Title |
Impact of electric fields on local structure, phonons, and thermal transport in a relaxor ferroelectric |
Author(s) |
Puspa Upreti, Douglas Abernathy, Raffi Sahul, Raphael Hermann, Michael Manley |
On-Site Speaker (Planned) |
Puspa Upreti |
Abstract Scope |
Relaxor-based ferroelectrics PMN-xPT have been extensively studied due to their giant electromechanical coupling that is utilized in sensors and ultrasound applications. The application of an external electric field impacts the structure on multiple scales ranging from induced local atomic displacements to polar nanoregions and longer range ferroelectric domain alignments. These structural responses influence the phonon dispersion (group velocities) and lifetimes, and, consequently, the thermal transport properties. With this motivation we have investigated the response of thermal transport properties to electric fields using a two-pronged approach. Inelastic neutron scattering measurements with ARCS were used to determine the phonon properties and single crystal diffuse scattering measurements on CORRELI were used to correlated with the changes in the local structures induced by electric field poling PMN-30PT at the Oak Ridge National Laboratory Spallation Neutron Source. |
Proceedings Inclusion? |
Planned: |