• Li, Xiaodong
• Hoque, Md Shafkat Bin
• Schmuckler, Daniel
• Maria, Jon-Paul
• Hopkins, Patrick
• Rost, Christina
• Gaskins, John T.
• Bumgardner, Clifton H.

Abstract

<jats:p>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.</jats:p>

Topics

• impedance spectroscopy
• phase
• x-ray diffraction
• phase transition
• thermal expansion
• ceramic
• thermal conductivity
• phase boundary