Impact of Cr Substitution on Structural, Magnetic, Electric and Impedance Study of Mn-Ni-Zn Ferrites

• 作者: Shanzida Haque Sajal Chandra Mazumdar Mohammed Nazrul Islam Khan Mithun Kumar Das
• 来源期刊: 材料科学与应用期刊(英文)
• 学科: 工学
• 关键词: X-Ray Diffraction PERMEABILITY Dielectric Property Curie Temperature Impedance Spectroscopy
• 年，卷（期）: 2021,（3）
• 页码范围: 121-138
• 页数: 18页
• 分类号: TG1

摘要

A series of Cr³⁺-substituted Mn-Ni–Zn ferrites;Mn_0.5Ni_0.1Zn_0.4Fe_2-xCr_xO₄ (<em>x</em> = 0.0 - 0.4 in a step of 0.1) were prepared by traditional solid-state reaction route. The structural, magnetic, dielectric properties and impedance spectroscopy of these compositions were studied. Phase identification and lattice constant (a₀) determination were carried out by X-ray diffraction (XRD). The XRD patterns established the fabrication of a single-phase spinel structure. The FESEM micrographs exposed that the average grain size (<img src="Edit_da92e8c9-165d-4d71-aaf5-717db2aa65e1.png" alt="" />) increased slightly with chromium (Cr) substitution and then decreased for a higher concentration of chromium in the composition. The real part of initial permeability (<img src="Edit_1d356971-e483-44dc-875c-698f938e7d9f.png" alt="" />) diminished owing to the enhanced porosity of the compositions with the increase of Cr³⁺ content in the composition. The highest relative quality factor (RQF) was attained for the samples with x = 0.1. The magnetic hysteresis was investigated to know the effect of Cr³⁺ substitution in the composition of the magnetic properties. The decrease of saturation magnetization (<em>M_s</em>) with an enhancement in Cr³⁺ might be triggered by switching of Fe³⁺ ions from octahedral to tetrahedral site. The samples with x = 0.1 exhibited the highest anisotropy constant (<em>K</em>). Curie temperatures of the investigated samples were significantly modified to lower temperatures with the Cr³⁺ content. The frequency characteristics of dielectric properties and impedance spectroscopy had been investigated. The highest dielectric constant (<em><span style="white-space:nowrap;">ε</span>'</em>) and resistivity were observed for x = 0.1 and x = 0.2 samples. The complex impedance spectra analysis reveals in-depth information about the conduction mechanism, microstr