| About this Abstract |
| Meeting |
2022 TMS Annual Meeting & Exhibition
|
| Symposium
|
Grain Boundaries and Interfaces: Metastability, Disorder, and Non-Equilibrium Behavior
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| Presentation Title |
Characterization of the Structure and Chemistry of Grain Boundaries and Heterointerfaces in Multiphase High Entropy Oxides Processed by Heat Treatment |
| Author(s) |
Hasti Vahidi, Alexander Davis Dupuy, Justin Cortez, Julie M Schoenenung, William John Bowman |
| On-Site Speaker (Planned) |
Hasti Vahidi |
| Abstract Scope |
High entropy oxide (HEO) materials greatly expand the available compositional space and possess promising functional properties for a range of ceramic applications, all of which are influenced by the presence of grain boundaries and heterointerfaces. Research on HEOs is still in its early stages and exploratory studies are required to understand the uniqueness and similarities between these complex oxides and conventional oxide ceramics. The rock salt (Co,Cu,Mg,Ni,Zn)O HEO system is known to undergo a reversible entropic phase transformation upon heat treatment, forming secondary phases that significantly change the microstructure of the material, thereby providing a means of controlling behavior and properties through heat treatment. Here, we use advanced transmission electron microscopy (TEM) and scanning TEM to observe the local atomic structure, composition, defect chemistry, and electronic structure of the heterointerfaces between the oxide precipitates and HEO matrix to elucidate how these phases form, grow, and potentially impact functionality. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Phase Transformations, Ceramics, Characterization |