Investigation of structural and magnetic properties of Cu-substituted NiZn spinel ferrites
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Investigation of structural and magnetic properties of Cu-substituted NiZn spinel ferrites Yong Li1 , Xiansong Liu1,*, Xucai Kan1,*, Shuangjiu Feng1, Qingrong Lv1, Jingwen Huang1, Jinkui Zhao1, and Jiyu Hu1 1
Engineering Technology Research Center of Magnetic Materials, School of Physics & Materials Science, Anhui University, Hefei 230601, People’s Republic of China
Received: 17 June 2020
ABSTRACT
Accepted: 17 August 2020
In this paper, Cu-substituted NiZn ferrites with nominal compositions of (Ni0.3Zn0.7)1-xCuxFe2O4 (0 B x B 0.4) were prepared by solid-state reaction method. Then, the structural, element composition, valence distribution, surface morphology and magnetic properties of the samples were investigated systematically. As the concentration of composition (x) increases, the lattice constant gradually decreases. When x = 0.1, the l0 are much higher than of the pure sample, and the power loss lower than that of the sample without Cu, which indicating a significant improvement as substituting in an appropriately extend. Thus, the high permeability and low power loss can be obtained by the small addition of Cu in NiZn ferrites, which improve the application range of the NiZn ferrites.
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Springer Science+Business
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1 Introduction Magnetic spinel ferrites have been wildly applied in many switch-mode power supplies and other electronic devices because of their excellent electrical properties, high saturation magnetization, and low power loss [1–3]. In general, those physical properties are determined by the local [4]. The spinel ferrites with structural configuration MFe2O4 (M = Co, Mg, Zn, Ni etc.) [5]. The ferrites MFe2O4 with the spinel structure are based on a face-center cubic lattice of the oxygen ions. In each unit cell with eight formula units, there are 64 tetrahedral sites and 32 octahedral sites [6]. Meanwhile, for spinel-type structural ferrites, including normal AB2O4 and inverse A2BO4 (A
and B sites represent tetrahedral gap and octahedral gap, respectively) [7]. Soft ferrites magnetic properties arise from interactions between metallic ions occupying particular positions relative to the oxygen ions in its spinel crystalline structure [8]. Over the past several decades, NiZn ferrites are useful in many magnetic devices operating in the radio frequency region and the changed magnetic properties enhanced their ability of applications in magnetic devices [9]. Previous investigations of NiZn ferrites mainly focused on how to lower the sintering temperature and how to improve electromagnetic properties [9–11]. Bayoumy et al. has reported the prepared Cr-substituted NiZnCu ferrites by the Eggwhite method, which reveal that the coercivity
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https://doi.org/10.1007/s10854-020-04273-y
J Mater Sci: Mater Electron
change with the particle sizes [12]. Hu et al. have reported the polycrystalline NiZn ferrites doped with Ti by the solid-state reaction and found that the real permeabil
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