Bajorek Anna, Łopadczak Paweł, Prusik Krystian, Zubko Maciej
A. Chełkowski Institute of Physics, University of Silesia in Katowice, 75 Pułku Piechoty 1, 41-500 Chorzów, Poland.
Silesian Center for Education and Interdisciplinary Research, University of Silesia in Katowice, 75 Pułku Piechoty 1A, 41-500 Chorzów, Poland.
Materials (Basel). 2021 Feb 8;14(4):805. doi: 10.3390/ma14040805.
Magnetic nanocomposites SmCo/α-Fe were synthesized mechanically by high-energy ball milling (HEBM) from SmCo and 5%wt. of α-Fe powders. The X-ray diffraction analysis reveals the hexagonal 1:5 phase as the main one accompanied by the cubic α-Fe phase and 2:17 rhombohedral as the secondary phase. The content of each detected phase is modified throughout the synthesis duration. A significant decrease in crystallite size with a simultaneous increase in lattice straining is observed. A simultaneous gradual reduction in particle size is noted from the microstructural analysis. Magnetic properties reveal non-linear modification of magnetic parameters associated with the strength of the exchange coupling induced by various duration times of mechanical synthesis. The highest value of the maximum energy product at room temperature is estimated for samples milled for 1 and 6 h. The intermediate mixed-valence state of Sm ions is confirmed by electronic structure analysis. An increase in the Co magnetic moment versus the milling time is evidenced based on the performed fitting of the Co3 core level lines.
通过高能球磨（HEBM）由SmCo和5%重量的α-Fe粉末机械合成磁性纳米复合材料SmCo/α-Fe。X射线衍射分析表明，六方1:5相是主要相，伴有立方α-Fe相和2:17菱面体相作为次要相。在整个合成过程中，每个检测相的含量都会发生变化。观察到微晶尺寸显著减小，同时晶格应变增加。微观结构分析表明，颗粒尺寸同时逐渐减小。磁性表明，与机械合成不同持续时间引起的交换耦合强度相关的磁参数发生非线性变化。对于研磨1小时和6小时的样品，估计室温下最大能量积的最高值。电子结构分析证实了Sm离子的中间混合价态。基于对Co3芯能级线的拟合，证明了Co磁矩随研磨时间的增加。
