X-raying Mg0.2Co0.2Ni0.2Cu0.2Zn0.2O: disentangling elemental contributions in a prototypical high-entropy oxide
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arXiv
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| Main Authors: | , , , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866909930001268736 |
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| author | Zinouyeva, Maryia Fracchia, Martina Maranini, Giulia Coduri, Mauro Impelluso, Davide Brookes, Nicholas B. Grilli, Lorenzo Kummer, Kurt Rosa, Francesco Aramini, Matteo Ghiringhelli, Giacomo Ghigna, Paolo Sala, Marco Moretti |
| author_facet | Zinouyeva, Maryia Fracchia, Martina Maranini, Giulia Coduri, Mauro Impelluso, Davide Brookes, Nicholas B. Grilli, Lorenzo Kummer, Kurt Rosa, Francesco Aramini, Matteo Ghiringhelli, Giacomo Ghigna, Paolo Sala, Marco Moretti |
| contents | 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. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2507_10428 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | X-raying Mg0.2Co0.2Ni0.2Cu0.2Zn0.2O: disentangling elemental contributions in a prototypical high-entropy oxide Zinouyeva, Maryia Fracchia, Martina Maranini, Giulia Coduri, Mauro Impelluso, Davide Brookes, Nicholas B. Grilli, Lorenzo Kummer, Kurt Rosa, Francesco Aramini, Matteo Ghiringhelli, Giacomo Ghigna, Paolo Sala, Marco Moretti Materials Science 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. |
| title | X-raying Mg0.2Co0.2Ni0.2Cu0.2Zn0.2O: disentangling elemental contributions in a prototypical high-entropy oxide |
| topic | Materials Science |
| url | https://arxiv.org/abs/2507.10428 |