有序异构功能材料

张海天, 张湘义

Heterostructured Functional Materials with Ordered Structures

ZHANG Hai-Tian, ZHANG Xiangyi

图2 原子尺度序构(成分梯度)对2∶17型SmCo异构磁体性能的影响[17,18]

Fig.2 Effects of atomic-scale ordered structure (composition gradient) on the magnetic properties of 2∶17-type SmCo heterostructured magnets (a) coercivity of the magnet as a function of annealing time at 850oC (μ0—magnetic constant,iHc—intrinsic coercivity, t—annealing time)[17] (b) EDX results of Cu concentration profile for samples before (sample A) and after (sample B) annealing for 5 min (The y-axis represents normalized atomic concentration of Cu)[17] (c) 3D atom maps of Sm and Cu, and the composition profiles of constituent elements selected from the 1∶5 cell boundary phase[18] (d, e) simulation results of 6 different anisotropy constant gradients (d), and their corresponding effects on the depinning field (e) (K1—first anisotropy constant)[18]