锌替代对反向尖晶石 NiFe2O4 结构、磁性和电传输特性的影响

IF 5.1 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International Pub Date : 2024-09-24 DOI:10.1016/j.ceramint.2024.09.304

Biman Kar , Pawan Kumar , Simanchalo Panigrahi , Durga Prasad Sahu , Subhankar Mishra

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引用次数: 0

摘要

本研究报告对块状 NiFe2O4 和 Ni0.7Zn0.3Fe2O4 陶瓷的结构、磁性和电传输特性进行了比较研究。这些材料是通过固态反应法合成的。X 射线衍射分析证实了铁氧体样品的立方尖晶石结构属于 Fd 3‾ m 空间群。通过对 X 射线衍射数据的里特维尔德细化和拉曼研究，对陶瓷的结构分析进行了全面评估。由于锌的替代，Ni0.7Zn0.3Fe2O4 微结构中的晶粒尺寸增大。结构和微观结构的改变使 Ni0.7Zn0.3Fe2O4 陶瓷的磁性和电性发生了显著变化。由于锌的替代，Ni0.7Zn0.3Fe2O4 体系的饱和磁化率大幅提高，矫顽力下降。XPS 分析证实，由于晶粒尺寸增大，Fe3+ 和 Fe2+ 离子之间的电子跳跃增大，在 Zn 取代的镍铁氧体陶瓷中观察到直流电阻率下降。此外，由于电荷跳跃和界面极化加剧，在镍锌铁氧体中观察到了明显的介电弛豫。Ni0.7Zn0.3Fe2O4 的复合阻抗谱显示了表面极化与晶粒和晶界对电传输特性的影响。

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Effect of Zn substitution on structural, magnetic and electric transport properties in inverse spinel NiFe2O4

In the present investigation, we report a comparative study of structural, magnetic and electric transport properties in bulk NiFe₂O₄ and Ni_0.7Zn_0.3Fe₂O₄ ceramics. The materials were synthesized by solid state reaction method. X-ray diffraction analysis confirmed the cubic spinel structure of the ferrite samples belonging to the Fd

\overline{3}

m space group. The structural analysis of the ceramics was comprehensively evaluated from Rietveld refinements of the XRD data and Raman studies. An increased grain size in the Ni_0.7Zn_0.3Fe₂O₄ microstructure was noticed due to Zn substitution. Both structural and microstructural modifications led to a significant change in the magnetic and electric properties of the Ni_0.7Zn_0.3Fe₂O₄ ceramic. A large increase in saturation magnetization with decreased coercivity was noticed in the Ni_0.7Zn_0.3Fe₂O₄ system due to Zn substitution. DC resistivity was observed to decrease in the Zn-substituted nickel ferrite ceramic due to increased grain size and larger electron hopping between Fe³⁺ and Fe²⁺ ions, as verified by the XPS analysis. Further, a remarkable dielectric relaxation has been observed in the Ni-Zn ferrite owing to greater charge hopping and interfacial polarization. Complex impedance spectra of Ni_0.7Zn_0.3Fe₂O₄ revealed evidence of surface polarization contribution with grain and grain boundary effect on the electric transport properties.

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来源期刊

Ceramics International 工程技术-材料科学：硅酸盐

CiteScore

9.40

自引率

15.40%

发文量

4558

审稿时长

25 days

期刊介绍： Ceramics International covers the science of advanced ceramic materials. The journal encourages contributions that demonstrate how an understanding of the basic chemical and physical phenomena may direct materials design and stimulate ideas for new or improved processing techniques, in order to obtain materials with desired structural features and properties. Ceramics International covers oxide and non-oxide ceramics, functional glasses, glass ceramics, amorphous inorganic non-metallic materials (and their combinations with metal and organic materials), in the form of particulates, dense or porous bodies, thin/thick films and laminated, graded and composite structures. Process related topics such as ceramic-ceramic joints or joining ceramics with dissimilar materials, as well as surface finishing and conditioning are also covered. Besides traditional processing techniques, manufacturing routes of interest include innovative procedures benefiting from externally applied stresses, electromagnetic fields and energetic beams, as well as top-down and self-assembly nanotechnology approaches. In addition, the journal welcomes submissions on bio-inspired and bio-enabled materials designs, experimentally validated multi scale modelling and simulation for materials design, and the use of the most advanced chemical and physical characterization techniques of structure, properties and behaviour. Technologically relevant low-dimensional systems are a particular focus of Ceramics International. These include 0, 1 and 2-D nanomaterials (also covering CNTs, graphene and related materials, and diamond-like carbons), their nanocomposites, as well as nano-hybrids and hierarchical multifunctional nanostructures that might integrate molecular, biological and electronic components.