| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in Ceramic Materials and Processing
|
| Presentation Title |
Quasi High Entropy 3D Alumina Based Glasses: Sintering, Structural Relaxation, and Nano-Crystallization |
| Author(s) |
Angshuman Gupta, Ashutosh Suresh Gandhi |
| On-Site Speaker (Planned) |
Angshuman Gupta |
| Abstract Scope |
An alumina-based glass was designed by adopting a quasi-high-entropy approach wherein four alumina-rich binary eutectic compositions were brought together in equimolar ratio. Solution combustion synthesized glassy powder exhibits glass transition temperature Tg ~225 °C, and crystallization temperature Tx exceeding 950 °C. The wide Tx – Tg window facilitates sintering without crystallization. Dielectric, thermal properties, band gap, and coefficient of thermal expansion were measured on the bulk sample, made possible by the ability to produce 3D shapes of the quasi-high-entropy glass. 27Al MAS NMR and EXAFS were utilized to probe local structure in terms of Al3+ coordination environment, and stabilizing cations. Annealing of bulk glasses was performed to investigate structural evolution leading to changes in the macroscopic properties. Nano-crystallization studies were conducted on the dense glasses. This study opens up the opportunity to obtain bulk dense glassy and nanocrystalline alumina ceramics. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Ceramics, Characterization, High-Temperature Materials |