Abstract
The first entropy-stabilized oxide, (Mg0.2Co0.2Ni0.2Cu0.2Zn0.2)O, was reported in 2015. Initial studies synthesized this material using solid state processing and were limited to densities < 80%. Here, we report a straightforward solid state route to sinter samples to densities up to 98% of the theoretical by identifying the role of oxygen and promoting the resulting mechanisms in densification. Previous works have studied effects of cation stoichiometry on the entropy-driven reaction to form a single phase, but few have explored the associated effects of anion stoichiometry and/or redox chemistry on both phase stability and densification. We demonstrate here that tuning heating rate and pO2 during heating of initially-homogeneous calcined powders can enhance densifying diffusion processes and enable reliable sintering of dense Mg0.2Co0.2Ni0.2Cu0.2Zn0.2)O samples.
Original language | American English |
---|---|
Pages (from-to) | 4328-4334 |
Number of pages | 7 |
Journal | Journal of the European Ceramic Society |
Volume | 42 |
Issue number | 10 |
DOIs | |
State | Published - 2022 |
NREL Publication Number
- NREL/JA-5K00-82772
Keywords
- entropy
- mixing
- oxide
- thermal profile