Macroscopic Gradient Ordered a-Fe/Pr2Fe14B Nanocomposites with Ultrahigh Energy Density
Macroscopic Gradient Ordered a-Fe/Pr2Fe14B Nanocomposites with Ultrahigh Energy Density
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DOI：
10.1021/acs.nanolett.2c02778
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发表时间：
2022-09-14
期刊：
影响因子：
10.8
通讯作者：
Zhang, Xiangyi
中科院分区：
文献类型：
--
作者：
Li, Xiaohong;Lou, Li;Zhang, Xiangyi
纳米粒子自组装使得能够产生具有增强的性质或新功能的复杂有序纳米结构。然而，由于控制自组装过程的相对较弱的超分子相互作用，这种有序化通常限于微米尺度的化学策略。在这里，通过温度梯度辅助自组装的物理策略，报告创建三维（3D）宏观有序的纳米复合材料具有不同的梯度变化的晶粒尺寸，成分含量和晶体取向。所得的α-Fe/Pr 2Fe 14 B有序纳米结构的晶粒尺寸和α-Fe含量的反向梯度表现出约25 MGOe的各向同性α-Fe/Pr 2Fe 14 B系统的创纪录的高能量密度，约130%，高于其无序对应物。实验和微磁模拟都表明，创建有序的纳米结构是开发高性能永磁材料的另一种方法。我们的研究结果朝着创造3D宏观有序纳米结构迈出了重要的一步，并将刺激有序纳米材料的发展。
Nanoparticle self-assembly enables the generation of complex ordered nanostructures with enhanced properties or new functionalities. However, the ordering is often limited to the micrometer scale with chemical strategies due to the relative weak supramolecular interactions that govern the self-assembly process. Here a physical strategy via temperature-gradient-assisted self assembly is reported to create three-dimensional (3D) macroscopic ordered nanocomposites with different gradient variations in grain size, constituent content, and crystal orientation. The resulting alpha-Fe/Pr2Fe14B ordered nanostructure with reverse gradients in both the grain size and alpha-Fe content exhibits a record-high energy density of about 25 MGOe for isotropic alpha-Fe/ Pr2Fe14B systems, approximately 130% higher than that of its disordered counterpart. Both experiments and micromagnetic simulations demonstrate that creating ordered nanostructures is an alternative approach to develop high-performance permanent magnet materials. Our findings make a significant step toward creating 3D macroscopic ordered nanostructures and will stimulate the development of ordered nanomaterials.