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<p>The present study aimed to understand the structural, magnetic, and electrical features of MFe<sub>2</sub>O<sub>4</sub> nanocrystals (M = Mg<sup>2+</sup>, Co<sup>2+</sup>, Ni<sup>2+</sup>, Cu<sup>2+</sup>, Zn<sup>2+</sup>) synthesized via simple co-precipitation route and doing a comparative study with materials prepared using other routes. XRD showed the single-phase cubic structure formation for the samples only after calcination at 700<sup>o</sup>C. An exception was obtained with MgFe<sub>2</sub>O<sub>4,</sub> which retains the Fe<sub>2</sub>O<sub>3</sub> secondary phase, and CuFe<sub>2</sub>O<sub>4,</sub> which showed a structure transformation into a tetragonal phase. FT-IR spectroscopy indicated the pronouncing of the atomic weight effect on the ionic radii when discussing the present difference in the bands` positions. Agglomerated sphere-like cluster morphologies were detected through a TEM study. Magnetic studies showed ferromagnetic properties for CoFe<sub>2</sub>O<sub>4</sub> and CuFe<sub>2</sub>O<sub>4</sub>, as well as superparamagnetic properties for the other ferrites. Also, only CoFe<sub>2</sub>O<sub>4</sub> and CuFe<sub>2</sub>O<sub>4</sub> showed hard ferrite types, while others indicated soft ones. The electrical investigations exhibited semi-conducting properties for all the samples, accompanied by a transition in the conduction mechanism from hopping to polaron as the temperature rose. The obtained conductivities order is CuFe<sub>2</sub>O<sub>4</sub> &gt; CoFe<sub>2</sub>O<sub>4</sub> &gt; ZnFe<sub>2</sub>O<sub>4</sub> &gt; NiFe<sub>2</sub>O<sub>4</sub> &gt; MgFe<sub>2</sub>O<sub>4</sub>. The low dielectric values obtained suggest the use of entire ferrites in microwave applications.</p>

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Understanding the structural, magnetic, and electrical properties of MFe2O4 (M = Mg2+, Co2+, Ni2+, Cu2+, Zn2+) nanocrystalline ferrites. A comparative study

  • 期刊论文

  • 发表日期：

    2025年1月17日

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  • M. A. Gabal,
  • R. S. Al-luhaibi,
  • Y. M. Al Angari,
  • A. Awad,
  • A. A. Al-Juaid,
  • Abdu Saeed

摘要

The present study aimed to understand the structural, magnetic, and electrical features of MFe2O4 nanocrystals (M = Mg2+, Co2+, Ni2+, Cu2+, Zn2+) synthesized via simple co-precipitation route and doing a comparative study with materials prepared using other routes. XRD showed the single-phase cubic structure formation for the samples only after calcination at 700oC. An exception was obtained with MgFe2O4, which retains the Fe2O3 secondary phase, and CuFe2O4, which showed a structure transformation into a tetragonal phase. FT-IR spectroscopy indicated the pronouncing of the atomic weight effect on the ionic radii when discussing the present difference in the bands` positions. Agglomerated sphere-like cluster morphologies were detected through a TEM study. Magnetic studies showed ferromagnetic properties for CoFe2O4 and CuFe2O4, as well as superparamagnetic properties for the other ferrites. Also, only CoFe2O4 and CuFe2O4 showed hard ferrite types, while others indicated soft ones. The electrical investigations exhibited semi-conducting properties for all the samples, accompanied by a transition in the conduction mechanism from hopping to polaron as the temperature rose. The obtained conductivities order is CuFe2O4 > CoFe2O4 > ZnFe2O4 > NiFe2O4 > MgFe2O4. The low dielectric values obtained suggest the use of entire ferrites in microwave applications.