Doping effect of Sm³⁺ on magnetic and dielectric properties of Ni-Zn ferrites

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• 作者：Zhiqing Liu^a ; ^b ; Zhijian Peng^a ; ^{pengzhijian@cugb.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Changchun Lv^a ; Xiuli Fu^b ; ^{xiulifu@bupt.edu.cn" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Ni-Zn ferrite ; Doping ; Sm ; Electromagnetic properties
• 刊名：Ceramics International
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：43
• 期：1
• 页码：1449-1454
• 全文大小：1051 K

文摘

Ni-Zn ferrites of nominal composition Ni_0.5Zn_0.5Sm_xFe_2-xO₄ (x=0–0.1) were prepared by a conventional two-steps solid sintering method. The effect of Sm³⁺ doping on the microstructural, magnetic and dielectric properties of the as-prepared Ni-Zn ferrites were investigated. The main phase of all the samples was ferrite spinel, and the samples doped with Sm³⁺ ions contained a small amount of a foreign SmFeO₃ phase as well. And the doping of Sm³⁺ resulted in the increase of lattice constant. The grain size, density and densification of the ferrites initially decreased after Sm³⁺ doping, but then increased with more Sm³⁺ doped. With increasing substitution level, x, the saturation magnetization of the as-prepared ferrites decreased, while the coercivity increased. The Curie temperature raised initially and decreased later with increasing content of Sm³⁺ in the samples, reaching a maximum of 274 °C when x=0.025. The initial permeability of the ferrites first decreased and then increased with increasing doping amount of Sm³⁺ ions. The introduction of Sm³⁺ ions into Ni-Zn ferrite would lead to the reduced dielectric loss in the frequency range of 1–100 MHz, but the dielectric loss raised when more Sm³⁺ was added in the frequency range of 100–1000 MHz. When x=0.05, the dielectric loss reached the lowest value.