About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in Ceramic Materials and Processing
|
| Presentation Title |
Engineering Low Thermal Conductivity in Compositionally Complex Rare Earth Pyrochlores Oxides |
| Author(s) |
Sean Drewry, Katharine Page, Joshua Safin |
| On-Site Speaker (Planned) |
Sean Drewry |
| Abstract Scope |
Pyrochlore type oxides (A2B2O7) are a promising candidate for simultaneously stiff and insulative ceramics which serve as a key element in multilayer thermal barrier coating systems. Further reductions in thermal conductivity have been achieved in pyrochlore oxides through compositional complexity, incorporating multiple cation species on a single crystallographic lattice site. Recently, ionic size disorder was shown to strongly correlate with low thermal conductivity compositions among compositionally complex rare earth pyrochlores (RE2B2O7, where B =Ti, Zr, Hf, ...etc). A series of RE titanate pyrochlores (RE2Ti2O7), where the RE composition was systematically changed to increase ionic size disorder, showed a monotonic decrease in thermal conductivity while mechanical properties were maintained. X-ray total scattering measurements were performed on the series of RE titanates. Atomic structure refinements and atomic pair distribution function (PDF) analysis was used to elucidate the fundamental mechanisms behind the evolution of thermal conductivity and mechanical properties with compositions. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Ceramics, High-Temperature Materials, Other |