In this paper, we study the elastic properties of the entropy-stabilized oxide (Mg, Co, Ni, Cu, Zn)O using experimental and first principles techniques. Our measurements of the indentation modulus on grains with a wide range of crystallographic orientations of the entropy-stabilized oxide revealed a high degree of elastic isotropy at ambient conditions. First principles calculations predict mild elastic anisotropy for the paramagnetic structure, which decreases when the system is considered to be non-magnetic. When the antiferromagnetic state of CoO, CuO, and NiO is accounted for in the calculations, a slight increase in elastic anisotropy is observed, suggesting a coupling between magnetic ordering and the orientation dependent elastic properties. Furthermore, an examination of the local structure reveals that the isotropy is favored through local ionic distortions of Cu and Zn—due to their tendencies to form tenorite and wurtzite phases. The relationships between the elastic properties of the multicomponent oxide and those of its constituent binary oxides are reviewed. These insights open up new avenues for controlling isotropy for technological applications through tuning composition and structure in the entropy-stabilized oxide or the high-entropy compounds in general.
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On the elastic anisotropy of the entropy-stabilized oxide (Mg, Co, Ni, Cu, Zn)O compound
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7 July 2020
Research Article|
July 01 2020
On the elastic anisotropy of the entropy-stabilized oxide (Mg, Co, Ni, Cu, Zn)O compound
Krishna Chaitanya Pitike
;
Krishna Chaitanya Pitike
1
Materials Science and Technology Division, Oak Ridge National Laboratory
, 1 Bethel Valley Rd., Oak Ridge, Tennessee 37831, USA
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Andres E. Marquez-Rossy;
Andres E. Marquez-Rossy
1
Materials Science and Technology Division, Oak Ridge National Laboratory
, 1 Bethel Valley Rd., Oak Ridge, Tennessee 37831, USA
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Alexis Flores-Betancourt;
Alexis Flores-Betancourt
1
Materials Science and Technology Division, Oak Ridge National Laboratory
, 1 Bethel Valley Rd., Oak Ridge, Tennessee 37831, USA
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De Xin Chen;
De Xin Chen
1
Materials Science and Technology Division, Oak Ridge National Laboratory
, 1 Bethel Valley Rd., Oak Ridge, Tennessee 37831, USA
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KC Santosh;
KC Santosh
2
Chemical and Materials Engineering, San José State University
, San José, California 95112, USA
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Valentino R. Cooper
;
Valentino R. Cooper
1
Materials Science and Technology Division, Oak Ridge National Laboratory
, 1 Bethel Valley Rd., Oak Ridge, Tennessee 37831, USA
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Edgar Lara-Curzio
Edgar Lara-Curzio
a)
1
Materials Science and Technology Division, Oak Ridge National Laboratory
, 1 Bethel Valley Rd., Oak Ridge, Tennessee 37831, USA
a)Author to whom correspondence should be addressed: laracurzioe@ornl.gov
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a)Author to whom correspondence should be addressed: laracurzioe@ornl.gov
J. Appl. Phys. 128, 015101 (2020)
Article history
Received:
April 20 2020
Accepted:
June 14 2020
Citation
Krishna Chaitanya Pitike, Andres E. Marquez-Rossy, Alexis Flores-Betancourt, De Xin Chen, KC Santosh, Valentino R. Cooper, Edgar Lara-Curzio; On the elastic anisotropy of the entropy-stabilized oxide (Mg, Co, Ni, Cu, Zn)O compound. J. Appl. Phys. 7 July 2020; 128 (1): 015101. https://doi.org/10.1063/5.0011352
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