About this Abstract |
| Meeting |
MS&T25: Materials Science & Technology
|
| Symposium
|
Energy Materials for Sustainable Development
|
| Presentation Title |
Tuning Thermal Transport in Perovskite Oxides via Defect and Strain Engineering |
| Author(s) |
Sepideh Akhbarifar, Mohammad El Loubani, Md Shafkat Bin Hoque, Scott Bender, Dongkyu Lee, Patrick Hopkins |
| On-Site Speaker (Planned) |
Sepideh Akhbarifar |
| Abstract Scope |
Reducing thermal conductivity in perovskite oxides is central to enhancing thermoelectric performance. This talk compares two approaches for suppressing lattice thermal conductivity in Sr-based perovskites. In bulk SrTi₁₋ₓRuₓO₃, ruthenium doping introduces point defect scattering, lowering κ from 5.5 to 1.01 W/m·K at room temperature. Extending this concept to thin films, we investigate epitaxial SrRuO₃ layers grown on lattice-mismatched substrates, where compressive strain is used to modulate oxygen vacancy concentrations. Using time-domain thermoreflectance, we observe that strained films exhibit reduced thermal conductivity relative to bulk SrRuO₃. While compressive strain improves electrical conductivity, we emphasize that boundary scattering and reduced oxygen vacancy disorder further contribute to the suppression of thermal transport. These results demonstrate that structural and defect engineering, whether through doping or strain, offers a powerful route to control phonon-mediated heat transport in complex oxides. Preliminary thermal conductivity findings in thin films are presented with acknowledgment of ongoing collaborative work. |