Peculiar behavior of V on the Curie temperature and anisotropy field of SmFe12-xVx compounds

Peculiar behavior of V on the Curie temperature and anisotropy field of SmFe12-xVx compounds
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V对SmFe12-xVx化合物居里温度和各向异性场的特殊行为

DOI:
10.1016/j.actamat.2022.117928
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发表时间:
2022
期刊:
影响因子:
9.4
通讯作者:
Takahashi Y.K.
Takahashi Y.K.
中科院分区:
材料科学1区
文献类型:
--
作者:
Tozman P.;Fukazawa T.;Ogawa D.;Sepehri-Amin H.;Bolyachkin A.;Miyake T.;Hirosawa S.;Hono K.;Takahashi Y.K.

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研究了V对SmFe_(12-x)Vx(0 ≤x≤ 1.9)薄膜和SmFe_(12-x)Vx(x= 1.5和2)体相稳定性和内禀磁性的影响。发现V通过降低晶格参数c和c/aratio至其固溶度极限x = 1.4而有助于稳定ThMn 12型相。在此极限以上,在显微组织中观察到富Sm相的形成。有趣的是,居里温度(Tc)和各向异性场(μ 0 Ha)不表现出与磁化强度(μ 0 Ms)相同的趋势,其中增加V增强这两个量,同时降低磁化强度。Tc从x = 0时的533 K增加到x = 1时的660 K,这与第一性原理计算结果一致,这与Fe-V耦合沿着加强及其周围的Fe-Fe耦合作用有关。通过微磁学模拟证实了在10 ~ 12 T之间的室温各向异性场的保持。此外,在300-550 K温度范围内,V取代化合物的μ 0 Has值高于SmFe 12和Nd 2Fe 14 B。比较SmFe_(11)M_(11)M_(11)中M = Ti、Ti_(0.5)V_(0.5)和V的相稳定元素,发现V的μ 0 Ms、μ 0 Ha和Tc最高。该研究表明,具有7at.%的V-取代化合物相稳定剂比钛代相稳定剂具有更大的优点,有利于开发具有更好外磁性能的高性能磁体。
The effect of V on the phase stability and intrinsic magnetic properties of SmFe12-xVx(0 ≤x≤ 1.9) thin films, and bulk SmFe12-xVx(x= 1.5 and 2) are investigated. It is found that V help to stabilize the ThMn12-type phase by decreasing the lattice parameterscand thec/aratio up to its solid solubility limitx= 1.4. Above this limit, the formation of Sm-rich phase has been observed in the microstructure. Interestingly, Curie temperature (Tc) and anisotropy field (μ0Ha) do not exhibit the same trend with the magnetization (μ0Ms) where increasing V enhances the two quantities while decreasing the magnetization. TheTcincrease from 533 K forx= 0 up to 660 K forx= 1 agrees with first principles calculation and it is related with the strengthening of the effect of Fe-V coupling along with its surrounding Fe-Fe couplings. Preservation of room temperature anisotropy field between 10 and 12 T is confirmed by micromagnetic simulation. In addition, V-substituted compounds demonstrate a higher μ0Hathan SmFe12and Nd2Fe14B in the temperature range of 300–550 K. A comparison of the phase stabilizing elementsM= Ti, Ti0.5V0.5, and V in SmFe11M1reveals that V yields the highest μ0Ms, μ0Ha, and Tc. This study demonstrates that V-substituted compounds with 7 at.% phase stabilizers have more merit than Ti-substituted ones for the development of high-performance magnet with better extrinsic magnetic properties.
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发表时间: 2020-06-11
影响因子: 4.6
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