Effect of heat treatment on structural, optical and magneto-dielectric properties of Co–Cu spinel nano ferrites

IF 1.6 4区 物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY
Poorva Rani, Priyanka Godara, Ram Mehar Singh, Ashok Kumar
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Abstract

Here, we have investigated the impact of heat treatment on structural, morphological, optical and magneto-dielectric properties of Co0.5Cu0.5Fe2O4 spinel nanoferrites prepared by sol–gel auto-combustion method. The prepared samples were sintered at 700, 800, and 900 °C and then characterized by XRD, FTIR, SEM, UV–Vis spectroscopy, VSM and impedance analyser techniques. The obtained XRD patterns were refined with Full Prof Suite Software which confirmed the cubic spinel structure of the prepared sample and it was observed that crystallite size increases from 38 to 44 m with increase in sintering temperature and the same is confirmed by W–H plot also. The SEM micro graphs represent the morphological features of the prepared samples and average particle size was calculated by using the imageJ software, which ranges 47–126 nm with increase in temperature. The FTIR spectra confirmed the presence of tetrahedral and octahedral sites in the prepared samples. Various optical parameters were recorded using UV–Vis spectroscopy and it was found that optical band gap energy decreased from 3.976 to 3.832 eV, whereas refractive index increased from 2.262 to 2.283, and high frequency dielectric constant varied from 5.114 to 5.210 with rise in temperature which was due to decrease in grain boundary area and porosity. The magnetic studies were carried out at room temperature using VSM and it was found that magnetic parameters get improved with increase in sintering temperature. Dielectric measurements were made by impedance analyser in a frequency range of 20 Hz to 10 MHz which were in consonance with Maxwell–Wagner polarization and Koop’s theory.

Abstract Image

热处理对 Co-Cu 尖晶石纳米铁氧体结构、光学和磁介电特性的影响
在此,我们研究了热处理对溶胶-凝胶自燃烧法制备的 Co0.5Cu0.5Fe2O4 尖晶石的结构、形态、光学和磁介电特性的影响。制备的样品在 700、800 和 900 °C 下烧结,然后通过 XRD、傅立叶变换红外光谱、扫描电子显微镜、紫外可见光谱、VSM 和阻抗分析仪技术进行表征。用 Full Prof Suite 软件对所获得的 XRD 图谱进行了细化,证实了所制备样品的立方尖晶石结构,并观察到随着烧结温度的升高,结晶尺寸从 38 m 增加到 44 m,W-H 图也证实了这一点。SEM 显微图显示了制备样品的形态特征,并使用 imageJ 软件计算了平均粒度,随着温度的升高,粒度范围为 47-126 nm。傅立叶变换红外光谱证实了制备的样品中存在四面体和八面体位点。使用紫外可见光谱记录了各种光学参数,发现光带隙能从 3.976 eV 下降到 3.832 eV,折射率从 2.262 上升到 2.283,高频介电常数随着温度的升高从 5.114 变化到 5.210,这是由于晶界面积和孔隙率的减少。磁性研究是在室温下使用 VSM 进行的,结果发现磁性参数随着烧结温度的升高而提高。用阻抗分析仪在 20 Hz 至 10 MHz 的频率范围内进行了介电测量,结果与 Maxwell-Wagner 极化和 Koop 理论一致。
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来源期刊
Indian Journal of Physics
Indian Journal of Physics 物理-物理:综合
CiteScore
3.40
自引率
10.00%
发文量
275
审稿时长
3-8 weeks
期刊介绍: Indian Journal of Physics is a monthly research journal in English published by the Indian Association for the Cultivation of Sciences in collaboration with the Indian Physical Society. The journal publishes refereed papers covering current research in Physics in the following category: Astrophysics, Atmospheric and Space physics; Atomic & Molecular Physics; Biophysics; Condensed Matter & Materials Physics; General & Interdisciplinary Physics; Nonlinear dynamics & Complex Systems; Nuclear Physics; Optics and Spectroscopy; Particle Physics; Plasma Physics; Relativity & Cosmology; Statistical Physics.
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