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

Authors :
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
Source :
APL Materials. 10:121108
Publication Year :
2022
Publisher :
AIP Publishing, 2022.

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.

Details

ISSN :
2166532X
Volume :
10
Database :
OpenAIRE
Journal :
APL Materials
Accession number :
edsair.doi...........d5f2a752a81ef2ca90cce0addf81a380