On the thermal and mechanical properties of Mg0.2Co0.2Ni0.2Cu0.2Zn0.2O across the high-entropy to entropy-stabilized transition

Christina M. Rost, Daniel L. Schmuckler, Clifton Bumgardner, Md Shafkat Bin Hoque, David R. Diercks, John T. Gaskins, Jon Paul Maria, Geoffrey L. Brennecka, Xiadong Li, Patrick E. Hopkins

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6 Scopus citations

Abstract

As various property studies continue to emerge on high entropy and entropy-stabilized ceramics, we seek a further understanding of the property changes across the phase boundary between "high-entropy"and "entropy-stabilized"phases. The thermal and mechanical properties of bulk ceramic entropy stabilized oxide composition Mg0.2Co0.2Ni0.2Cu0.2Zn0.2O are investigated across this critical transition temperature via the transient plane-source method, temperature-dependent x-ray diffraction, and nano-indentation. The thermal conductivity remains constant within uncertainty across the multi-to-single phase transition at a value of ≈2.5 W/mK, while the linear coefficient of thermal expansion increases nearly 24% from 10.8 to 14.1 × 10-6 K-1. Mechanical softening is also observed across the transition.

Original languageEnglish (US)
Article number121108
JournalAPL Materials
Volume10
Issue number12
DOIs
StatePublished - Dec 1 2022

All Science Journal Classification (ASJC) codes

  • General Materials Science
  • General Engineering

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