Interplanar ferromagnetism enhanced ultrawide zero thermal expansion in kagome cubic intermetallic (Zr,Nb)Fe2
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Date
2023-07-25
Journal Title
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Publisher
American Chemical Society
Abstract
A cubic metal exhibiting zero thermal expansion (ZTE) over a wide temperature window demonstrates significant applications in a broad range of advanced technologies but is extremely rare in nature. Here, enabled by high-temperature synthesis, we realize tunable thermal expansion via magnetic doping in the class of kagome cubic (Fd-3m) intermetallic (Zr,Nb)Fe2. A remarkably isotropic ZTE is achieved with a negligible coefficient of thermal expansion (+0.47 × 10-6 K-1) from 4 to 425 K, almost wider than most ZTE in metals available. A combined in situ magnetization, neutron powder diffraction, and hyperfine Mössbauer spectrum analysis reveals that interplanar ferromagnetic ordering contributes to a large magnetic compensation for normal lattice contraction upon cooling. Trace Fe-doping introduces extra magnetic exchange interactions that distinctly enhance the ferromagnetism and magnetic ordering temperature, thus engendering such an ultrawide ZTE. This work presents a promising ZTE in kagome metallic materials. © 2023 American Chemical Society.
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Keywords
Ferromagnetism, Thermal expansion, Intermetallic compounds, Niobium, Zirconium, Iron, Temperature range, Synthesis, Crystal doping, Neutron diffraction, Magnetism, Magnetic properties
Citation
Sun, Y., Cao, Y., Hu, S., Avdeev, M., Wang, C.-W., Khmelevskyi, S., Ren, Y., Lapidus, S. H., Chen, X., Li, Q., Deng, J., Miao, J., Lin, K., Kuang, X., & Xing, X. (2023). Interplanar ferromagnetism enhanced ultrawide zero thermal expansion in kagome cubic intermetallic (Zr,Nb)Fe2. Journal of the American Chemical Society, 145(31), 17096-17102. doi:10.1021/jacs.3c03160