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X-raying Mg0.2Co0.2Ni0.2Cu0.2Zn0.2O: disentangling elemental contributions in a prototypical high-entropy oxide

by Grilli, Lorenzo , Aramini, Matteo , Zinouyeva, Maryia , Kummer, Kurt , Ghigna, Paolo , Maranini, Giulia , Rosa, Francesco , Coduri, Mauro , Marco Moretti Sala , Fracchia, Martina , Ghiringhelli, Giacomo , Impelluso, Davide , Brookes, Nicholas B

in Entropy / Inelastic scattering / Jahn-Teller effect / Magnetic properties / Physical properties

2025

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X-raying Mg0.2Co0.2Ni0.2Cu0.2Zn0.2O: disentangling elemental contributions in a prototypical high-entropy oxide

in Entropy / Inelastic scattering / Jahn-Teller effect / Magnetic properties / Physical properties

2025

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X-raying Mg0.2Co0.2Ni0.2Cu0.2Zn0.2O: disentangling elemental contributions in a prototypical high-entropy oxide

in Entropy / Inelastic scattering / Jahn-Teller effect / Magnetic properties / Physical properties

2025

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Paper

X-raying Mg0.2Co0.2Ni0.2Cu0.2Zn0.2O: disentangling elemental contributions in a prototypical high-entropy oxide

Grilli, Lorenzo,

Aramini, Matteo,

Zinouyeva, Maryia,

Kummer, Kurt,

Ghigna, Paolo,

Maranini, Giulia,

Rosa, Francesco,

Coduri, Mauro,

Marco Moretti Sala,

Fracchia, Martina,

Ghiringhelli, Giacomo,

Impelluso, Davide,

Brookes, Nicholas B

2025

Overview

We employ several X-ray based techniques, including X-ray diffraction, absorption and resonant inelastic scattering, to disentangle the contributions of individual chemical species to the structural, electronic and magnetic properties of high-entropy oxides. In the benchmark compound Mg0.2Co0.2Ni0.2Cu0.2Zn0.2O and related systems, we unambiguously resolve a sizable Jahn-Teller distortion at the Cu sites, more pronounced in the absence of Ni2+ and Mg2+, suggesting that these ions promote positional order, whereas Cu2+ ions act to destabilize it. Moreover, we detect magnetic excitations and estimate the strength of the interactions between pairs of different magnetic elements. Our results provide valuable insights into the role of the various chemical species in shaping the physical properties of high-entropy oxides.

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Publisher

Cornell University Library, arXiv.org

Subject

Entropy

/ Inelastic scattering

/ Jahn-Teller effect

/ Magnetic properties

/ Physical properties