| About this Abstract |
| Meeting |
MS&T21: Materials Science & Technology
|
| Symposium
|
Phase Transformations in Ceramics: Science and Applications
|
| Presentation Title |
Critical Parameters Controlling the Formation of High-entropy Oxides |
| Author(s) |
Kuo-Pin Tseng, Benjamin S. Hulbert, Qun Yang, Waltraud M. Kriven |
| On-Site Speaker (Planned) |
Waltraud M. Kriven |
| Abstract Scope |
The formation of a multi-component system often suffers from phase separation during synthesis, resulting in multiple phases instead of single-phase materials. In high-entropy oxides, multiple cations should be constrained in a single-phase solid solution with homogeneous distribution. In formation of high-entropy oxides, both size mismatch and valance configuration among constituent cations have significant effects. Two lanthanide systems were designed to reveal the influence between these key parameters and the final oxide structures. The results demonstrate that a large mismatch in cations could trigger the failure in single-phase formation. On the other hand, the crystal structures of high-entropy oxides be modified by the preferred valence configurations of constituent cations. Here, this research provided a protocol for cation selection in order to synthesize high-entropy ceramics and explore the next generation of structure-stabilized ceramics. |