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

doi:10.1063/5.0122775

On the thermal and mechanical properties of Mg_0.2Co_0.2Ni_0.2Cu_0.2Zn_0.2O 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

Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

13 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 language	English (US)
Article number	121108
Journal	APL Materials
Volume	10
Issue number	12
DOIs	https://doi.org/10.1063/5.0122775
State	Published - Dec 1 2022

All Science Journal Classification (ASJC) codes

General Materials Science
General Engineering

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10.1063/5.0122775

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title = "On the thermal and mechanical properties of Mg0.2Co0.2Ni0.2Cu0.2Zn0.2O 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 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.",

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

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doi = "10.1063/5.0122775",

language = "English (US)",

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AU - Rost, Christina M.

AU - Schmuckler, Daniel L.

AU - Bumgardner, Clifton

AU - Bin Hoque, Md Shafkat

AU - Diercks, David R.

AU - Gaskins, John T.

AU - Maria, Jon Paul

AU - Brennecka, Geoffrey L.

AU - Li, Xiadong

AU - Hopkins, Patrick E.

PY - 2022/12/1

Y1 - 2022/12/1

N2 - 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.

AB - 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.

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On the thermal and mechanical properties of Mg_0.2Co_0.2Ni_0.2Cu_0.2Zn_0.2O across the high-entropy to entropy-stabilized transition

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