铁磁性
热膨胀
凝聚态物理
化学
超精细结构
磁化
中子衍射
金属间化合物
负热膨胀
材料科学
结晶学
晶体结构
磁场
冶金
物理
原子物理学
有机化学
合金
量子力学
作者
Yanming Sun,Yili Cao,Shixin Hu,Maxim Avdeev,Chin-Wei Wang,Sergii Khmelevskyi,Yang Ren,Saul H. Lapidus,Xin Chen,Qiang Li,Jinxia Deng,Jun Miao,Kun Lin,Xiaojun Kuang,Xianran Xing
摘要
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.
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