Sun Yanming, Cao Yili, Hu Shixin, Avdeev Maxim, Wang Chin-Wei, Khmelevskyi Sergii, Ren Yang, Lapidus Saul H, Chen Xin, Li Qiang, Deng Jinxia, Miao Jun, Lin Kun, Kuang Xiaojun, Xing Xianran
Beijing Advanced Innovation Center for Materials Genome Engineering, Institute of Solid State Chemistry, Department of Physical Chemistry, University of Science and Technology Beijing, Beijing 100083, China.
Institute of Applied Magnetics, Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education, Lanzhou University, Lanzhou 730000, People's Republic of China.
J Am Chem Soc. 2023 Aug 9;145(31):17096-17102. doi: 10.1021/jacs.3c03160. Epub 2023 Jul 25.
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 (-3) intermetallic (Zr,Nb)Fe. A remarkably isotropic ZTE is achieved with a negligible coefficient of thermal expansion (+0.47 × 10 K) 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.
一种在很宽温度范围内表现出零热膨胀（ZTE）的立方金属在广泛的先进技术中具有重要应用，但在自然界中极为罕见。在此，通过高温合成，我们在 Kagome 立方（-3）金属间化合物（Zr，Nb）Fe 类中通过磁掺杂实现了可调热膨胀。从 4 到 425 K 实现了显著各向同性的 ZTE，热膨胀系数可忽略不计（+0.47×10⁻⁶K⁻¹），几乎比大多数现有金属中的 ZTE 范围更广。原位磁化、中子粉末衍射和超精细穆斯堡尔谱分析相结合表明，面间铁磁有序对冷却时正常晶格收缩的大磁补偿有贡献。微量 Fe 掺杂引入了额外的磁交换相互作用，显著增强了铁磁性和磁有序温度，从而产生了如此超宽的 ZTE。这项工作展示了 Kagome 金属材料中一种有前景的 ZTE。
