| About this Abstract |
| Meeting |
MS&T22: Materials Science & Technology
|
| Symposium
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50 Years of Characterizing Structural Ceramics and Glasses: Recognizing the Contributions of George Quinn
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| Presentation Title |
On the Elastic Isotropy of the Entropy-stabilized Oxide (Mg, Co, Ni, Cu, Zn)O Compound |
| Author(s) |
Edgar Lara-Curzio, Krishna Chaitanya Pitike , Andres E. Marquez-Rossy, Alexis Flores-Betancourt, De Xin Chen, Santosh KC, Valentino R. Cooper |
| On-Site Speaker (Planned) |
Edgar Lara-Curzio |
| Abstract Scope |
The elastic properties of the entropy-stabilized oxide (Mg, Co, Ni, Cu, Zn)O compound were determined by nanoindentation and estimated using first principles calculations. Values of the indentation modulus obtained on grains with a wide range of crystallographic orientations revealed a high degree of elastic isotropy.
First principles calculations predict mild elastic anisotropy for the paramagnetic structure, which decreases when the system is considered to be non-magnetic. When the antiferromagnetic state of CoO, CuO, and NiO is accounted for, a slight increase in elastic anisotropy is predicted, suggesting a coupling between magnetic ordering and the orientation dependent elastic properties. An examination of the local structure reveals that the isotropy is favored through local ionic distortions of Cu and Zn, due to their tendencies to form tenorite and wurtzite phases. The relationships between the elastic properties of the multicomponent oxide and those of its constituent binary oxides are reviewed |