Interplanar Ferromagnetism Enhanced Ultrawide Zero Thermal Expansion in Kagome Cubic Intermetallic (Zr,Nb)Fe2

作者：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^*

来源：Journal of the American Chemical Society, 2023, 145(31): 17096-17102.

DOI：10.1021/jacs.3c03160

• INVAR
• NI

A cubic metal exhibiting zero thermalexpansion (ZTE)over a widetemperature window demonstrates significant applications in a broadrange of advanced technologies but is extremely rare in nature. Here,enabled by high-temperature synthesis, we realize tunable thermalexpansion via magnetic doping in the class of kagome cubic (Fd-3m) intermetallic (Zr,Nb)Fe-2. A remarkably isotropic ZTE is achieved with a negligible coefficientof thermal expansion (+0.47 x 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, andhyperfine Mo''ssbauer spectrum analysis reveals that interplanarferromagnetic ordering contributes to a large magnetic compensationfor normal lattice contraction upon cooling. Trace Fe-doping introducesextra magnetic exchange interactions that distinctly enhance the ferromagnetismand magnetic ordering temperature, thus engendering such an ultrawideZTE. This work presents a promising ZTE in kagome metallic materials.

• 单位
  桂林理工大学; 北京科技大学; 兰州大学