Comparison on the magnetic properties and phase evolution of melt-spun SmCo7 ribbons with Zr and Hf substitution

Chang, H. W.; Huang, Sheng-en; Chang, Chih‐Wen; Chiu, Chien‐Liang; Chen, I.W.; Chang, W.C.; Sun, Andy; Yao, Y. D.

doi:10.1016/j.scriptamat.2007.02.009

Cited by 48 publications

(8 citation statements)

References 20 publications

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“…The grain size and morphology are almost unchanged with a slight Ta substitution. The role of Ta in enhancing the coercivity of melt spun SmCo 7−x M x ribbons is unlike those of Ti, Zr, Hf, or V elements reported elsewhere, 9,10,14,15 which is mainly arisen from the enhancement of magnetic anisotropy field of the 1:7 crystal structure. On the other hand, inasmuch as the Ta element is nonmagnetic, the remanence of the SmCo 7−x Ta x ribbons is diluted from 63.1 emu/g for x = 0 to 48.6 emu/g for x = 0.3.…”

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confidence: 55%

Crystal structure and magnetic properties of melt spun SmCo7−xMx (M=Ta, Cr, and Mo; x=–0.6) ribbons

Hsieh

Chang

Guo

et al. 2010

Journal of Applied Physics

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The crystal structure and magnetic properties of melt spun SmCo 7−x M x ͑M = Ta, Cr, and Mo; x =0-0.6͒ ribbons have been investigated. Based on x-ray diffraction analysis, it is found that a pure TbCu 7 -type structure is formed in the melt spun SmCo 7−x Ta x ͑x=0-0.3͒ ribbons, while minor amount of additional 2:17 phase appears for the SmCo 7−x M x ͑M = Cr and Mo; x = 0.1-0.6͒ ribbons, implying that the elements in VI B group ͑Cr and Mo͒ are inferior to the element in V B group ͑Ta͒ in stabilizing metastable 1:7 phase. The result, analyzed by Rietveld refinement method, shows that Ta, Cr, and Mo may occupy the 2e site of 1:7 phase, which leads to the enhancement of the magnetic anisotropy field of 1:7 phase, just like Ti, Zr, Hf, Nb, or V did. From the magnetic performance point of view, with increasing the content of doping element x from 0 to 0.6, the maximum coercivity of SmCo 7−x M x ribbons is enhanced from 1.9 kOe for binary SmCo 7 to 11.3 kOe for M = Ta, 6.6 kOe for M = Cr, and 7.5 kOe for M = Mo, respectively, while the remanent magnetization is all reduced for the above ternary alloy ribbons.In order to search for novel permanent magnetic materials for high temperature applications, researches have been focused intensively on Sm͑Co, M͒ 7 alloys with TbCu 7 -type structure due to their excellent intrinsic magnetic properties. 1-13 The TbCu 7 -type structure can be regarded as a derivative of CaCu 5 -type structure ͑space group P6/mmm͒ in which a part of Sm atoms is disorderedly substituted by "dumbbell" pair of Co-Co, 1 and it keeps merit of the 1:5 structure, such as high anisotropy, and of the 2:17 structure, such as high magnetization and high Curie temperature. However, 1:7 is a metastable structure which is easy to decompose into 1:5 and 2:17 phases, and therefore, a third element is necessary to stabilize the SmCo 7 phase with TbCu 7 -type structure. Sm͑Co, M͒ 7 ͑M = Ti, Zr, Hf, Cu, Ga, Si, and Ag͒ magnets with a pure 1:7 phase, prepared by arc melting followed by lengthy annealing, have been reported to exhibit large magnetic anisotropy field, which resulted from the occupancy of M on the 2e or 3g sites of 1:7 crystal structure. [6][7][8]11,13 Furthermore, nanocrystalline Sm͑Co, M͒ 7 ͑M = Ti, Hf, Zr, V, and Nb͒ magnets prepared by arc melting followed by rapid solidification were shown to exhibit excellent coercivity. 9,10,14-16 Substitution of IV B group metals, i.e., Ti, Hf, Zr, and V B group metals, i.e., V or Nb, for Co in SmCo 7−x M x ͑M = Hf, Zr, V, and Nb; x = 0.1-0.3͒ ribbons, has been found to occupy 2e site of the TbCu 7 -type structure, and consequently, enhances the magnetic properties effectively. However, Ta is at the same V B group as that of V and Nb in periodic table, while Cr and Mo are located at the VI B group. It is of interest to realize whether those three elements play the same role as V and Nb in TbCu 7 structure or not.The alloys with the nominal composition of SmCo 7−x M x ͑M=Ta, Cr, and Mo; x=0-0.6͒ were prepared using arc melting in a high purity argon atmosphere. To c...

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confidence: 55%

Crystal structure and magnetic properties of melt spun SmCo7−xMx (M=Ta, Cr, and Mo; x=–0.6) ribbons

Hsieh

Chang

Guo

et al. 2010

Journal of Applied Physics

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“…For applications, the largest possible magnetic response (magnetization) over the largest field range (set by the magnetocrystalline anisotropy measured by H a ), is optimal. For this reason, Sm(Co,M) 7 compounds (where M is a doping element) [5,6] have been the focus of intensive investigations as these compounds can exhibit both high saturation magnetizations and large magnetic anisotropies [7][8][9][10]. In terms of rare-earth magnet system, there is a driving economic force to find a replacement for Neodymium and Dysprosium rare-earth-based magnets, and Sm-Co based system are strong contenders [11].…”

Section: Introductionmentioning

confidence: 99%

“…In terms of rare-earth magnet system, there is a driving economic force to find a replacement for Neodymium and Dysprosium rare-earth-based magnets, and Sm-Co based system are strong contenders [11]. The SmCo 7 compound is metastable with a TbCu 7 -type structure but a doping element can be employed to stabilize the phase, and enhance the magnetic properties such as the coercivity (H c ), [7,10] that is the germane attribute for useful magnets at high temperature (>500°C) [12]. Stabilizing elements M = Ti, Zr, Hf, Si, Ga, Cu and V have been examined previously [9,[13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Origins of the significant improvement in nanocrystalline Samarium–Cobalt’s magnetic properties when doping with Niobium

Chiou

Chang

et al. 2015

Journal of Alloys and Compounds

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“…Zr [10,11,13], Nb [2], Ag [12] and Mo [14] and platinum group elements with non-full 5d-shell, e.g. Hf [10,12,[15][16][17][18]. Besides stabilizing elements, the additions of ceramic ZrB 2 , Cr 3 C 2 microparticles and non-metallic elements C and B are also attempted [19,20].…”

Section: Introductionmentioning

confidence: 99%

Effects of Hf and CNTs on magnetic transformation and thermal stabilities of TbCu7-type Sm–Co matrix ribbon magnets

Sun

Han

Cui

et al. 2009

Journal of Alloys and Compounds

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Comparison on the magnetic properties and phase evolution of melt-spun SmCo7 ribbons with Zr and Hf substitution

Cited by 48 publications

References 20 publications

Crystal structure and magnetic properties of melt spun SmCo7−xMx (M=Ta, Cr, and Mo; x=–0.6) ribbons

Crystal structure and magnetic properties of melt spun SmCo7−xMx (M=Ta, Cr, and Mo; x=–0.6) ribbons

Origins of the significant improvement in nanocrystalline Samarium–Cobalt’s magnetic properties when doping with Niobium

Effects of Hf and CNTs on magnetic transformation and thermal stabilities of TbCu7-type Sm–Co matrix ribbon magnets

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