| Pacific Rim Symposium on Surfaces, Coatings and Interfaces (PacSurf 2018) | |
| Thin Films | Thursday Sessions |
| Session TF-ThM |
| Session: | Nanostructured Surfaces and Thin Films: Synthesis and Characterization III |
| Presenter: | Jeffrey Braun, University of Virginia |
| Authors: | J. Braun, University of Virginia C. Rost, University of Virginia M. Lim, North Carolina State University A. Giri, University of Virginia D. Olson, University of Virginia G. Kotsonis, Pennsylvania State University G. Stan, National Institute of Standards and Technology D. Brenner, North Carolina State University J.-P. Maria, Pennsylvania State University P. Hopkins, University of Virginia |
| Correspondent: | Click to Email |
Manipulating a crystalline material's configurational entropy though the introduction of unique atomic species can produce novel materials with desirable mechanical and electrical properties. From a thermal transport perspective, large differences between elemental properties such as mass and interatomic force can reduce the rate at which phonons carry heat and thus reduce the thermal conductivity. Recent advances in materials synthesis have enabled the fabrication of entropy-stabilized ceramics, opening the door for understanding the implications of extreme disorder on thermal transport. Measuring the structural, mechanical, and thermal properties of single-crystal entropy stabilized oxides, we show that local ionic charge disorder can effectively reduce thermal conductivity without compromising mechanical stiffness. These materials demonstrate similar thermal conductivities to their amorphous counterparts, in agreement with the theoretical minimum limit, resulting in this class of material possessing the highest ratio of elastic modulus to thermal conductivity of any isotropic crystal.