Chapter 4 Anisotropy in iron-based soft magnetic materials

Soiński, M. S.; Moses, Anthony John

doi:10.1016/s1567-2719(05)80033-2

Cited by 14 publications

(14 citation statements)

References 72 publications

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“…Considering the angle position and relative intensity, all diffraction peaks were matched against the diffraction files of the Joint Committee on Power Diffraction Standards (JCPDS). In agreement with previous reports [29,42,46], the discernible peaks of 2 NPs were indexed to the lattice planes: (111), (220), (311), (400), (422), (511), (440), (620), (622); resulting to cubic spinel crystalline structure that can be easily indexed to synthetic Fe 3 O 4 (JCPDS 79-0417). In contrast 1, 3-6 NPs diffractograms showed no high intensity diffraction peaks which reveals the non-crystalline nature of those NPs.…”

Section: Xrd (X-ray Diffraction Pattern)supporting

confidence: 90%

“…Among the cyclic aliphatic secondary alcohols (Table 3, entries 5-8), the cycloketone yield increases with the ring size (C5 < C6 < C7 < C8), which is in accord with a previous report [40]. The activity and selectivity of the NPs should depend upon the metal ions, their oxidation states and their coordination in the lattices, the surface metal cation-oxygen bond strength, the amount of oxygen and morphology of the material [28,42,46].…”

Section: Catalytic Performancesupporting

confidence: 82%

“…The addition of a known C-or O-radical trap, Ph 2 NH or CBrCl 3 ( Table 2, entries 6 and 7, respectively) resulted in a strong inhibition of product formation, indicating the radical reaction nature of the catalytic system using t-BuOOH [31,32,40]. The 2 NPs (magnetite) show an inverse cubic spinel structure and the surface shows both Fe 3+ and Fe 2+ ions [29,46]. The oxidation of 1-phenylethanol can conceivably occur [31,32] upon hydrogen abstraction by t-BuOO · and t-BuO · radicals, formed by oxidation or reduction of t-BuOOH by Fe 3+ or Fe 2+ species at the surface of 2 NPs, respectively (Scheme 2 as an example).…”

Section: Catalytic Performancementioning

confidence: 99%

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Solvent-Free Microwave-Induced Oxidation of Alcohols Catalyzed by Ferrite Magnetic Nanoparticles

Martins

Amorim

et al. 2017

Catalysts

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Abstract:A series of first-row-transition-metal ferrite magnetic nanoparticles (NPs) MFe 2 O 4 [M = Mn 2+ (1), Fe 2+ (2), Co 2+ (3), Ni 2+ (4), Cu 2+ (5) or Zn 2+ (6)] were prepared by the co-precipitation method and characterized by Fourier transform infrared (FTIR) spectroscopy, powder X-ray diffraction (XRD), scanning electron microscope -energy dispersive X-ray spectrometry (SEM-EDS), vibrating sample magnetometer (VSM) and X-ray photoelectron spectroscopy (XPS). Those NPs were used as catalysts for the microwave-assisted oxidation of various alcohols in solvent-free medium. MnFe 2 O 4 (1), CoFe 2 O 4 (3) and CuFe 2 O 4 (5) act as catalysts for the conversion of alcohols to the corresponding ketones or aldehydes with a yield range of 81 to 94% in 2 h at 120 • C using t-BuOOH as an oxidant. These catalysts can be readily isolated by using an external magnet and no significant loss of activity is observed when reused up to 10 consecutive runs. The effects of some parameters, such as temperature, time, type of oxidant and presence of organic radicals, on the oxidation reactions were also investigated. The presented literature overview highlights the advantages of our new 1-6 NPs catalytic systems in terms of efficiency and economy, mainly due the used microwave (MW) heating mode.

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Section: Xrd (X-ray Diffraction Pattern)supporting

confidence: 90%

Section: Catalytic Performancesupporting

confidence: 82%

Section: Catalytic Performancementioning

confidence: 99%

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Solvent-Free Microwave-Induced Oxidation of Alcohols Catalyzed by Ferrite Magnetic Nanoparticles

Martins

Amorim

et al. 2017

Catalysts

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“…Non-oriented steels are usually considered as isotropic materials, with the same magnetic properties in any direction. Grain-oriented steels exhibit strong anisotropy of magnetic properties, created by many rolling and re-crystallization production steps [1][2][3][4][5][6][7]. In fact, non-oriented steels may reveal a significant level of anisotropy [2,8], which can affect the efficiency of electrical devices.…”

Section: Introductionmentioning

confidence: 99%

Scaling-based prediction of magnetic anisotropy in grain-oriented steels

Najgebauer¹

2017

Archives of Electrical Engineering

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Abstract:The paper presents the scaling-based approach to analysis and prediction of magnetic anisotropy in grain-oriented steels. Results of the anisotropy scaling indicate the existence of two universality classes. The hybrid approach to prediction of magnetic anisotropy, combining the scaling analysis with the ODFs method, is proposed. This approach is examined in prediction of angular dependencies of magnetic induction as well as magnetization curves for the 111-35S5 steel. It is shown that it is possible to predict anisotropy of magnetic properties based on measurements in three arbitrary directions for φ = 0°, 60° and 90°. The relatively small errors between predicted and measured values of magnetic induction are obtained.

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“…magnetic cores and occurs even in the so-called NO ES, as described in [2]. The crystallographic structure (110) [001] of the most common ES (the Goss texture) is one of the most important structures in crystallized body-centered cubic iron [3].…”

Section: Introductionmentioning

confidence: 99%

Angular Properties of Specific Total Loss Components Under Axial Magnetization in Grain-Oriented Electrical Steel

Pluta

2016

IEEE Trans. Magn.

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Electrical steel (ES) plays an important role in the design of magnetic circuit cores of electrical machines. Separating specific total loss into components is an excellent tool for loss analysis in ES. As is commonly accepted, the specific total loss is separated into three components: hysteresis and both classical and additional eddy current loss components. In addition, the conventional grainoriented (GO) ES presents the strong anisotropy of magnetic properties, due to the (110) [001] Goss texture, with [001] the easiest direction [parallel to rolling direction (RD)], with intermediate [011] and magnetically worst [111] directions, at angles x = 0°, 90°, and about 54°to RD, respectively. However, magnetization angles 0°< x < 54°and 54°< x < 90°also play a very important role in the research of specific total loss components. The angular properties of specific total loss under axial magnetization in GO ES should be most preferably evaluated by the use of single-sheet tester with specimens cut at different angles with respect to RD. This paper demonstrates, in the quantitative way, the dependence of hysteresis P h and additional eddy current P a specific total loss components on Goss texture. In addition, the results obtained justify the division of specific total loss and its components in two flux density regions: below B m ≤ 1 T (the lower region) and above B m > 1 T (the upper region). This paper is intended to offer a better understanding of phenomena that cause magnetic anisotropy, i.e., different Goss textures.Index Terms-Additional loss factor, classical and additional eddy current loss components, electrical steel (ES), Goss texture, hysteresis loss component, loss separation, specific total loss.

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Chapter 4 Anisotropy in iron-based soft magnetic materials

Cited by 14 publications

References 72 publications

Solvent-Free Microwave-Induced Oxidation of Alcohols Catalyzed by Ferrite Magnetic Nanoparticles

Solvent-Free Microwave-Induced Oxidation of Alcohols Catalyzed by Ferrite Magnetic Nanoparticles

Scaling-based prediction of magnetic anisotropy in grain-oriented steels

Angular Properties of Specific Total Loss Components Under Axial Magnetization in Grain-Oriented Electrical Steel

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