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Impact of aluminum substitution on the structural and dielectric properties of Ni-Cu spinel ferrite nanoparticles synthesized via sol-gel route

机译：铝取代对通过溶胶 - 凝胶途径合成的Ni-Cu尖晶石铁氧体纳米粒子结构和介电性能的影响

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摘要

Aluminum substituted nickel copper Ni_(0.5)Cu_(0.5)Al_xFe_(2-x)O_4 (x = 0.0, 0.2, 0.4 and 0.6) spinel ferrite nanoparticles were prepared via sol-gel auto combustion method. All the samples were annealed at 600 °C for three hours in muffle furnace. The prepared samples were characterized using X-ray diffraction, scanning electron microscopy, Fourier transform infrared spectroscopy and Impedance Spectroscopy to investigate their structure, morphology and electrical properties. The cubic structure (FCC) with preferred orientation along (311) plane was found with crystallite size of 17-21 nm. Few diffraction peaks corresponding to the secondary phase appear due to insufficient reaction between Al~(3+) and Fe~(3+) ions. Lattice constant, unit cell volume, dislocation density, stacking fault, lattice strain and micro-strain have been studied as a function of substitution effect. The appropriate substitution is evident from reduction in lattice strain and unit cell volume resulted from significant change in lattice parameters. The real and imaginary parts of dielectric constant, complex modulus, impedance and tangent loss of prepared nanoparticles have been investigated in the frequency range from 100 Hz to 20 MHz. The hopping of charge carriers at higher frequencies would result in improved conduction mechanism for these nanomaterials. Small crystallite size and low dielectric loss of aluminum substituted nickel copper spinel ferrite nanoparticles would make them potential candidate for high storage memory devices, cancer treatment and microwave applications, respectively.
机译：铝取代镍铜Ni_（0.5）Cu_（0.5）Al_xFe_（2-X）O_4（x = 0.2,0.4和0.6）通过溶胶 - 凝胶自燃方法制备尖晶石铁氧体纳米粒子。将所有样品在600℃下在马弗炉中在600℃下退火3小时。使用X射线衍射，扫描电子显微镜，傅里叶变换红外光谱和阻抗光谱进行了制备的样品，以研究它们的结构，形态和电性能。发现具有优选取向的立方结构（FCC）（311）平面，具有17-21nm的微晶尺寸。由于Al〜（3+）和Fe〜（3+）离子之间的反应不充分，对应于二次相的几个衍射峰。作为替代效果的函数研究了晶格常数，单位细胞体积，位错密度，堆叠故障，晶格应变和微应变。从晶格菌株的减少和单位细胞体积中显而易见的是，由于晶格参数的显着变化导致的单位细胞体积。在100Hz至20MHz的频率范围内研究了介电常数，复杂模量，阻抗和切相损失的真实和虚部的部分。在较高频率下电荷载波的跳跃将导致这些纳米材料的传导机制改善。铝取代镍铜尖晶石铁氧体纳米粒子的小微晶尺寸和低介电损耗将分别为它们提供高储存记忆装置，癌症治疗和微波应用的潜在候选者。

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  • 来源
    《Optical and quantum electronics》 |2020年第4期|190.1-190.17|共17页
  • 作者

    Kiran Shahzadi; Ali Dad Chandio; Ghulam Mustafa; Muhammad Khalid; Junaid Kareem Khan; Muhammad Saeed Akhtar; Zaheer Abbas Gilani; H. M. Noor ul Huda Khan Asgar;

  • 作者单位

    Department of Physics NED University of Engineering and Technology Karachi 75270 Pakistan;

    Department of Metallurgical Engineering NED University of Engineering and Technology Karachi 75270 Pakistan;

    Department of Physics NED University of Engineering and Technology Karachi 75270 Pakistan;

    Department of Physics Balochistan University of Information Technology Engineering and Management Sciences Quetta 87300 Pakistan;

    Department of Physics Balochistan University of Information Technology Engineering and Management Sciences Quetta 87300 Pakistan;

    Department of Physics University of Education Lahore Pakistan;

    Department of Physics Balochistan University of Information Technology Engineering and Management Sciences Quetta 87300 Pakistan;

    Department of Physics Balochistan University of Information Technology Engineering and Management Sciences Quetta 87300 Pakistan;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Spinel ferrite; Sol-gel route; XRD; FTIR; Dielectric properties;

    机译：尖晶石铁氧体;溶胶 - 凝胶路线;XRD;FTIR;介电性质;

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