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Effects of Mg Substitution on the Structural and Magnetic Properties of Ni0.2MgxCo0.8−xFe2O4 Nanoparticle Ferrites

  • Xiqian Zhao
  • Aimin SunEmail author
  • Wei Zhang
  • Yingqiang Han
  • Xiaoguang Pan
Original Paper
  • 18 Downloads

Abstract

Sol-gel auto-combustion is a method of preparing ferrite by combining combustion with chemical gel. In this study, Ni-Mg-Co ferrite powders are prepared by coprecipitation method, and the nanocrystals of Ni0.2MgxCo0.8−xFe2O4 are successfully synthesized. The structure and magnetic properties of undoped and Mg-substituted Ni-Co ferrite nanoparticles are systematically investigated. The methods used to characterize the prepared samples are X-ray diffraction (XRD) analysis, Fourier transform infrared spectroscopy (FTIR), and Vibrating sample magnetometry (VSM). The synthesized samples are confirmed by XRD analysis to form a single-phase cubic spinel structure with crystals between 48 and 50 nm. With the increase of Mg ion concentration, the lattice constant decreases. The results of FTIR spectroscopy indicated that a spinel structure was formed. Transmission electron microscopy (TEM) images show spherical cubic microcrystals in the samples. EDX analysis confirms that the synthesized ferrite is pure phase structure, and Mg2+ is successfully replaced. With the increase of Mg2+ ion content, the saturation magnetization and remanent magnetization decreased from 70.16 to 39.77 emu/g and 36.40 to 20.20 emu/g at room temperature, respectively. Meanwhile, the coercivity decreases from 1032.16 to 378.50 Oe by increasing Mg2+ concentration. This also indicates that the Mg-substituted Ni-Co nano-ferrite has a low magnetic of multi-ferric material. The increasing of peak height of dM/dH at Hm indicates that the cubic spinel structure sample has good crystallinity and magnetic stability.

Keywords

Ni-Mg-Co ferrite Mg-substituted Sol-gel auto-combustion Structural Magnetic properties 

Notes

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  • Xiqian Zhao
    • 1
  • Aimin Sun
    • 1
    • 2
    Email author
  • Wei Zhang
    • 1
  • Yingqiang Han
    • 1
  • Xiaoguang Pan
    • 1
  1. 1.College of Physics and Electronics EngineeringNorthwest Normal UniversityLanzhouChina
  2. 2.Key Laboratory of Atomic and Molecular Physics & Functional Materials of Gansu ProvinceNorthwest Normal UniversityLanzhouChina

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