About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
|
Advances in Powder and Ceramic Materials Science
|
Presentation Title |
The Role of Aliovalent Dopants in Multiphase Entropy Stabilized Oxides |
Author(s) |
Jacob Eugene Norman, Alexander Davis Dupuy, Julie M Schoenung |
On-Site Speaker (Planned) |
Jacob Eugene Norman |
Abstract Scope |
Entropy stabilized oxides exhibit a reversible phase transformation between single-phase and multiphase states, giving rise to controllable phase heterogeneity. This presents an opportunity to produce oxide materials with highly controlled phase states, microstructures, and behavior. We hypothesize that doping with aliovalent oxides is an additional strategy to engineer the phase transformation behavior by changing the defect chemistry and promoting the formation of enthalpy driven phases. Here we test his hypothesis by synthesizing (CoCuMgNiZn)O (2+ valence) with single-valence and mixed-valence oxide dopants. Examples include oxides of Fe, Cr, Mn, and Ti. These doped powders are consolidated through conventional sintering and then heat-treated to examine the phase evolution as a function of temperature. The influence of dopant and heat-treatment on microstructure and phase state is characterized through X-ray diffraction and electron microscopy. The influence of the dopant and phase evolution on functional and mechanical behavior are also explored. |
Proceedings Inclusion? |
Planned: |
Keywords |
Ceramics, Phase Transformations, Other |