High-Entropy Magnet Enabling Distinctive Thermal Expansions in Intermetallic Compounds
The high-entropy strategy has gained increasing popularity in the design of functional materials due to its four core effects. In this study, we introduce the concept of a "high-entropy magnet (HEM)", which integrates diverse magnetic compounds within a single phase and is anticipated to demonstrate unique magnetism-related properties beyond that of its individual components. This concept is exemplified in AB<sub>2</sub>-type layered Kagome intermetallic compounds (Ti,Zr,Hf,Nb,Fe)Fe<sub>2</sub>. It is revealed that the competition among individual magnetic states and the presence of magnetic Fe in originally nonmagnetic high-entropy sites lead to intricate magnetic transitions with temperature. Consequently, unusual transformations in thermal expansion property (from positive to zero, negative, and back to near zero) are observed. Specifically, a near-zero thermal expansion is achieved over a wide temperature range (10-360 K, α<sub>v</sub> = -0.62 × 10<sup>-6</sup> K<sup>-1</sup>) in the A-site equal-atomic ratio (Ti<sub>1/5</sub>Zr<sub>1/5</sub>Hf<sub>1/5</sub>Nb<sub>1/5</sub>Fe<sub>1/5</sub>)Fe<sub>2</sub> compound, which is associated with successive deflection of average Fe moments. The HEM strategy holds promise for discovering new functionalities in solid materials.
Authors
- Jinghan Li (ORCID: https://orcid.org/0000-0003-3619-5121)
- Hankun Xu
- Kenichi Kato (ORCID: https://orcid.org/0000-0002-1954-5508)
- Xin Chen (ORCID: https://orcid.org/0000-0002-5120-1983)
- Yili Cao (ORCID: https://orcid.org/0000-0003-0523-2073)
- Jun Miao (ORCID: https://orcid.org/0000-0002-6924-0737)
- Kun Lin (ORCID: https://orcid.org/0000-0003-4515-3206)
- Youyong Li (ORCID: https://orcid.org/0000-0002-5248-2756)
- Wentao Yang (ORCID: https://orcid.org/0000-0002-0769-4709)
- Shogo Kawaguchi (ORCID: https://orcid.org/0000-0002-8498-0936)
- Chengyi Yu (ORCID: https://orcid.org/0000-0002-5627-1825)
- Jinxia Deng (ORCID: https://orcid.org/0000-0002-3362-4595)
- Chin-Wei Wang
- Qinghua Zhang (ORCID: https://orcid.org/0000-0001-9086-7000)
- Jing Chen (ORCID: https://orcid.org/0000-0001-6703-2486)
- Qian Zhang (ORCID: https://orcid.org/0000-0002-1774-9726)
- Qiang Li (ORCID: https://orcid.org/0000-0003-4259-6984)
- Xianran Xing (ORCID: https://orcid.org/0000-0003-0704-8886)
Institutions
- University of Science and Technology (YE)
- National Synchrotron Radiation Research Center (TW)
- SPring-8 (JP)
- Institute of Solid State Physics (CN)
- State Key Laboratory for Advanced Metals and Materials
- University of Science and Technology Beijing (CN)
Publication Details
- Journal
- Journal of the American Chemical Society
- Published
- 2024-10-24
- DOI
- https://doi.org/10.1021/jacs.4c10681
- Citations
- 12
- Primary Topic
- Magnetic Properties of Alloys
- Type
- article
- Field-Weighted Citation Impact
- 1.41
Funders
- National Natural Science Foundation of China
- Bagui Scholars Program of Guangxi Zhuang Autonomous Region
- National Key Research and Development Program of China
- Fundamental Research Funds for the Central Universities