| About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
|
2024 Undergraduate Student Poster Contest
|
| Presentation Title |
SPU-17: Tailoring Cation Solubility in Rock Salt High Entropy Oxides |
| Author(s) |
Matthew Furst, Saeed Almishal, Jacob Sivak, Susan B. Sinnot, Jon-Paul Maria |
| On-Site Speaker (Planned) |
Matthew Furst |
| Abstract Scope |
Entropy stabilization offers a novel approach to materials stabilization, distinct from conventional enthalpy-minimization strategies. Entropy-stabilized materials exhibit unique properties due to local disorder coupled with long-range symmetry, unconventional coordination, and lattice distortions. In this study, we investigate derivatives of the prototypical high-entropy oxide (Mg1/5Co1/5Ni1/5Cu1/5Zn1/5)O by incorporating highly misfit cations, such as large Ca2+ and thermodynamically unfavorable Mn2+, challenging the solubility limit in HEO bulk ceramics. Moreover, we demonstrate that non-equilibrium kinetic pathways enabled by pulsed laser deposition (PLD) result in enhanced solubility in thin films compared to bulk. We use x-ray diffraction to determine the phase composition of both bulk and thin-film materials and employ calibrated x-ray fluorescence for precise chemical composition analysis. Although we focus on understanding cation-specific solubility in (Mg1/5Co1/5Ni1/5Cu1/5Zn1/5)O, this framework is broadly applicable to incorporate functional cations to tailor properties in other high-entropy materials. |