High-coercivity ThMn12-type monocrystalline Sm–Zr–Fe–Co–Ti particles by high-temperature reduction diffusion
High-coercivity ThMn12-type monocrystalline Sm–Zr–Fe–Co–Ti particles by high-temperature reduction diffusion
复制标题
高温还原扩散法制备高矫顽力ThMn12型单晶Sm-Zr-Fe-Co-Ti颗粒
DOI：
10.1016/j.scriptamat.2021.113760
复制
发表时间：
2021
影响因子：
6
通讯作者：
G. Hadjipanayis
中科院分区：
文献类型：
--
作者：
A. Gabay;G. Hadjipanayis
ThMn_（12）型（Sm，Zr）_（1（Fe，Co，Ti）_（12））化合物具有潜在的永磁性能。通过将元素氧化物和Co与Ca和CaO分散剂混合，进行一系列高能球磨，在990-1220°C下还原扩散和反复洗涤，制备了这种化合物的磁硬和各向异性粉末。所得到的ThMn 12型微晶的大小，它们的结晶度和单晶颗粒的分数都被发现与还原扩散温度增加。在1220°C下合成的颗粒是高度单晶的，平均尺寸为0.54 μm，并且在磁场对准之后，表现出1.26 T的矫顽力和至少209 kJ/m3（26.3 MGOe）的全密度投影最大能量积。还原-扩散温度对结晶度的强正效应归因于微晶的分离和结构缺陷的发生率的降低。
The ThMn12-type (Sm,Zr)1(Fe,Co,Ti)12compounds have the potential of powerful permanent magnets. Magnetically hard and anisotropic powders of such compound have been prepared by subjecting elemental oxides and Co mixed with Ca and CaO dispersant to a succession of high-energy ball-milling, reduction diffusion at 990–1220°C and repeated washing. The size of the resulting ThMn12-type crystallites, their coercivity and fraction of monocrystalline particles were all found to increase with the reduction-diffusion temperature. Particles synthesized at 1220°C were highly monocrystalline with a mean size of 0.54 μm and, after a magnetic-field alignment, exhibited a coercivity of 1.26 T and a full-density-projected maximum energy product of at least 209 kJ/m3(26.3 MGOe). The strong positive effect of the reduction-diffusion temperature on the coercivity has been attributed to separation of the crystallites and to decrease in the incidence of structural defects.