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We synthesized a high-entropy oxide with an ilmenite-type structure (Mg0.2Mn0.2Co0.2Ni0.2Zn0.2)TiO3 and revealed that it undergoes long-range antiferromagnetic ordering below TN ~ 9.5 K despite strong cation disorder. Neutron diffraction measurements showed that the magnetic structure comprises ferromagnetic honeycomb planes that stack antiferromagnetically, analogous to the parent CoTiO3 and NiTiO3 ilmenites. Derivatives of the high-entropy ilmenite were obtained by substituting one of the divalent cations of (Mg0.2Mn0.2Co0.2Ni0.2Zn0.2)TiO3 with an equimolar amount of Li+ ions and trivalent cations. The antiferromagnetic order remains robust against aliovalent doping that introduces extra disorder owing to cations with different valence states. In contrast, when the cation ratio was tuned to a Mn-rich composition of (Mg0.2Mn0.3Co0.15Ni0.15Zn0.2)TiO3, spin-glass freezing was observed, most likely because of the enhanced competition of the in-plane magnetic interactions. This suggests that long-range magnetic ordering in high-entropy materials is formed by a subtle balance of competing interactions, and fine-tuning of constituent magnetic ions provides control over their magnetic ground states.

権利情報:

• Creative Commons BY Attribution 4.0 International
  

キーワード: high-entropy oxide, magnetism, neutron diffraction

刊行年月日: 2026-09-22

出版者: American Chemical Society (ACS)

掲載誌:

• Chemistry of Materials (ISSN: 08974756) vol. 38 issue. 18 p. 9509-9517

研究助成金:

• Deutsche Forschungsgemeinschaft (DFG) 431403378

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1021/acs.chemmater.6c01899

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更新時刻: 2026-09-25 08:51:13 +0900

MDRでの公開時刻: 2026-09-25 10:38:48 +0900