Absence of Long-Range Magnetic Ordering in a Trirutile High-Entropy Oxide (Mn0.2Fe0.2Co0.2Ni0.2Cu0.2)Ta1.92O6–δ

Angelo, Gina; Klivansky, Liana; Philbrick, Jeremy G.; Kong, Tai; Zhang, Jian; Gui, Xin

doi:10.1021/acs.inorgchem.4c04165

Title: Absence of Long-Range Magnetic Ordering in a Trirutile High-Entropy Oxide (Mn_0.2Fe_0.2Co_0.2Ni_0.2Cu_0.2)Ta_1.92O_6–δ

Journal Article · Tue Feb 11 00:00:00 UTC 2025 · Inorganic Chemistry

DOI: https://doi.org/10.1021/acs.inorgchem.4c04165 · OSTI ID:2514476

Angelo, Gina ^[1]; Klivansky, Liana ^[2]; Philbrick, Jeremy G. ^[3]; Kong, Tai ^[3];

^[2];

^[1]

University of Pittsburgh, PA (United States)
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
University of Arizona, Tucson, AZ (United States)

Functionalities of solid-state materials are usually considered to be dependent on their crystal structures. The limited structural types observed in the emerging high-entropy oxides put constraints on the exploration of their physical properties and potential applications. Herein, we synthesized the first high-entropy oxide in a trirutile structure, (Mn_0.2Fe_0.2Co_0.2Ni_0.2Cu_0.2)Ta_1.92O_6–δ, and investigated its magnetism. The phase purity and high-entropy nature were confirmed by powder Xray diffraction and energy-dispersive spectroscopy, respectively. X-ray photoelectron spectroscopy indicated divalent Mn, Co, Ni, and Cu along with trivalent Fe. Magnetic property measurements showed antiferromagnetic coupling and potential short-range magnetic ordering below ~4 K. The temperature-dependent heat capacity data measured under zero and high magnetic fields confirmed the lack of long-range magnetic ordering and a possible low-temperature phonon excitation. The discovery of the first trirutile high-entropy oxide opens a new pathway for studying the relationship between the highly disordered atomic arrangement and magnetic interaction. Furthermore, it provides a new direction for exploring the functionalities of highentropy oxides.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); University of Pittsburgh, PA (United States)

Sponsoring Organization:: US Department of Energy; USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22), Scientific User Facilities Division (SC-22.3 )

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 2514476

Journal Information:: Inorganic Chemistry, Journal Name: Inorganic Chemistry Journal Issue: 7 Vol. 64; ISSN 0020-1669

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Crystal structure
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Title: Absence of Long-Range Magnetic Ordering in a Trirutile High-Entropy Oxide (Mn0.2Fe0.2Co0.2Ni0.2Cu0.2)Ta1.92O6–δ

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Title: Absence of Long-Range Magnetic Ordering in a Trirutile High-Entropy Oxide (Mn_0.2Fe_0.2Co_0.2Ni_0.2Cu_0.2)Ta_1.92O_6–δ