| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in Surface Engineering II
|
| Presentation Title |
Morphological Control of Tantalum Carbide through Surface Doping |
| Author(s) |
Tianqi Ren, Richard Tran, Sebastian Lee, Aric Bandera, Manuel Herrera, Xiang-Guo Li, Shyue Ping Ong, Olivia A. Graeve |
| On-Site Speaker (Planned) |
Richard Tran |
| Abstract Scope |
The morphology of nanoparticles plays a key role in tuning their chemical and physical characteristics. Here, we present a combined experimental and computational effort to explore the effects of surface doping on the surface thermodynamics, and by extension, the morphology of TaC nanoparticles. We base our study on nanoparticles of tantalum carbide doped with nickel, iron, cobalt, yttrium, and titanium and observe a 70% transition from round/irregular spheroids to cubes and cuboctahedrons with addition of various dopants. We determine that dopant segregation to the surface of the nanoparticles results in atomic orbital hybridization resulting in a significant decrease of up to 0.13 eVÅ-2 in the surface energy, thus providing the driving force for morphology control. These principles can be generalized to other transition metal-based ceramic nanoparticles. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |