Coercivity of Pulverized ThMn12 Compounds with a Limited Amount of α-(Fe,Co) Phase
Coercivity of Pulverized ThMn12 Compounds with a Limited Amount of α-(Fe,Co) Phase
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含有限量 α-(Fe,Co) 相的粉状 ThMn12 化合物的矫顽力
DOI：
10.2320/matertrans.m2019038
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发表时间：
2019
影响因子：
1.2
通讯作者：
S. Sugimoto
中科院分区：
文献类型：
--
作者：
T. Kuno;Shunji Suzuki;K. Urushibata;Kurima Kobayashi;S. Sugimoto
我们新制备了几乎无γ-(Fe,Co)相的ThMn₁₂化合物(Sm₀.₉Zr₀.₁)(Fe₀.₈Co₀.₂)₁₁.₃Ti₀.₇（A）和(Nd₀.₈Zr₀.₂)(Fe₀.₉Co₀.₁)₁₁.₃Ti₀.₇N₁.₅（B）。这些化合物在高温区域（473K）表现出优于Nd₂Fe₁₄B相的磁性能。我们还制备了一种典型的无γ-(Fe,Co)相化合物Nd(Fe₀.₈Co₀.₂)₁₁MoN₁.₃（C），它具有低饱和极化强度，但有高磁各向异性场和较好的热稳定性。我们研究了粉碎对化合物（A） - （C）的矫顽力（Hc）的影响。单畴颗粒的临界半径（Rc）对于（A）和（B）约为120nm，对于（C）约为400nm，是由每个样品中矫顽力最大的粉碎颗粒所测量的磁畴宽度确定的。随着粉碎时间增加，Hc分别增加到最大值，（A）为0.10MA/m，氮化的（B）为0.14MA/m，氮化的（C）为0.21MA/m。进一步粉碎样品会使Hc降低。这种降低主要是由于未氮化的（A）中的氧化以及（B）和（C）中晶格畸变的累积造成的。[doi:10.2320]
We newly prepared the ThMn 12 compounds (Sm 0.9 Zr 0.1 )(Fe 0.8 Co 0.2 ) 11.3 Ti 0.7 (A) and (Nd 0.8 Zr 0.2 )(Fe 0.9 Co 0.1 ) 11.3 Ti 0.7 N 1.5 (B), which were almost ¡ -(Fe,Co) phase-free. These compounds show magnetic properties superior to those of the Nd 2 Fe 14 B phase in the high-temperature region (473K). We also prepared a typical ¡ -(Fe,Co) phase-free compound, Nd(Fe 0.8 Co 0.2 ) 11 MoN 1.3 (C), which has a low saturation polarization, but a high magnetic anisotropy fi eld, and better thermal stability. We examined the e ff ect of pulverization on the coercivity ( H c ) of compounds (A) (C). The critical radii of single-domain particles ( R c ) were about 120nm for (A) and (B), and about 400nm for (C), and were determined from the measured magnetic domain widths of the most coercive pulverized particles of each sample. As the pulverization time increased, H c increased to maximum values of 0.10MAm ¹ 1 for (A), 0.14MAm ¹ 1 for nitrogenated (B), and 0.21MAm ¹ 1 for nitrogenated (C). Further pulverization of the samples decreased H c . The decrease was mainly caused by oxidation in non-nitrogenated (A) and by the accumulation of lattice distortion in (B) and (C). [doi:10.2320