| About this Abstract |
| Meeting |
MS&T22: Materials Science & Technology
|
| Symposium
|
Ceramics for a New Generation of Nuclear Energy Systems and Applications
|
| Presentation Title |
Phonon Broadening in High Entropy Ceramic Carbide |
| Author(s) |
Linu Malakkal, Kaustubh K Bawane, Cody A Dennet, Zilong Hua, Lingfeng He, Yongfeng Lu, Bai Cui |
| On-Site Speaker (Planned) |
Linu Malakkal |
| Abstract Scope |
In the quest for novel irradiation-resistant and high-temperature tolerant ceramic materials for nuclear applications, the high entropy ceramic carbide materials with outstanding properties are a promising material class. At high temperatures, material properties such as thermal stability, thermodynamic, elastic property, and thermal conductivity are critically influenced by atomic vibrations (phonons). In a crystalline ceramic, carbides with an extreme disorder of cations can induce significant phonon scattering and broadening, owing to the inherently present mass and force constant variances. Despite the importance, phonon scattering and broadening in high entropy ceramic carbide are still lacking. Hence, in this work, we use the abinitio calculations to systematically investigate the impact of the mass and force constant variance on the phonon spectral function of face-centered cubic HECC, from binaries up to 5-component high entropy alloys, addressing the key question of how chemical complexity impacts the phonons |