On the thermal and mechanical properties of Mg${}_{0.2}$Co${}_{0.2}$Ni${}_{0.2}$Cu${}_{0.2}$Zn${}_{0.2}$O across the high-entropy to entropy-stabilized transition

Abstract

As various property studies continue to emerge on high entropy and entropy-stabilized ceramics, we seek further understanding of property changes across the phase boundary between \enquote{high-entropy} and \enquote{entropy-stabilized}. The thermal and mechanical properties of bulk ceramic entropy stabilized oxide composition Mg${}_{0.2}$Co${}_{0.2}$Ni${}_{0.2}$Cu${}_{0.2}$Zn${}_{0.2}$O are investigated across this critical transition temperature via the transient plane-source method, temperature-dependent X-ray diffraction, and nano-indentation. 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 x 10${}^{-6}$ K${}^{-1}$. Mechanical softening is also observed across the transition.

14 pages, 4 figures, to be published in APL Materials

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