Densification of the Entropy Stabilized Oxide (Mg0.2Co0.2Ni0.2Cu0.2Zn0.2)O

Valerie Jacobson, K. Gann, M. Sanders, G. Brennecka

Research output: Contribution to journalArticlepeer-review

2 Scopus Citations

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 languageAmerican English
Pages (from-to)4328-4334
Number of pages7
JournalJournal of the European Ceramic Society
Volume42
Issue number10
DOIs
StatePublished - 2022

NREL Publication Number

  • NREL/JA-5K00-82772

Keywords

  • entropy
  • mixing
  • oxide
  • thermal profile

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