| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in Ceramic Materials and Processing
|
| Presentation Title |
Local structure dynamics in high entropy oxide thin films |
| Author(s) |
Christina M. Rost, Gabriela Niculescu, Gerald Bejger, John Barber, Joshua Wright, Saeed Almishal, Matthew Webb, Sai Venkata Gayathri Ayyagari, Jon-Paul Maria, Nasim Alem, John Heron |
| On-Site Speaker (Planned) |
Christina M. Rost |
| Abstract Scope |
High entropy oxide thin films offer a new frontier in materials science, promising unparalleled tunability and functionality. This study investigates the local structure of high entropy oxide thin films, specifically (MgNiCuCoZn)0.167(MnCr)0.083O, synthesized via pulsed laser deposition. By varying oxygen partial pressures, the films' lattice parameters and phase stability were examined through X-ray diffraction, revealing a decrease in lattice parameter with increased pO2 until phase separation onset. X-ray absorption fine structure analysis indicated that as cation valence changes, Cr and Co atoms shift to more energetically favorable coordination as pressure increases. Transmission electron microscopy confirmed X-ray-based observations, showing a transition from rock salt to spinel structure at higher deposition pressures. These findings enhance the understanding of cation behavior in high entropy oxides, informing future synthesis pathways for these materials. This talk discusses the current fundamental knowledge of local structural trends and their influence on global properties in high entropy oxides. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Ceramics, High-Entropy Alloys, Thin Films and Interfaces |