Synthesis and Characterization of Core–Shell NiFe2O4@MgFe2O4 and ZnFe2O4@MgFe2O4 Nanoferrites

Roumaih, Kh.; Yehia, M.; Hassan, H. E.

doi:10.1007/s10904-020-01476-y

Cited by 19 publications

(10 citation statements)

References 47 publications

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“…The synthesis, microstructure, morphological, and magnetic hysteresis loops of NiF@MgF and ZnF@MgF were previously studied [22]. So, this work is complete to the previous work to study the electrical and magnetic properties of NiF@MgF and ZnF@MgF and the relationship between the core MgF and the shell NiF or ZnF.…”

Section: Introductionmentioning

confidence: 84%

“…Hence, only electronic polarization contributes to the dielectric constant at the high frequency; therefore the lower value of the dielectric constant is obtained. In other words, the values of dielectric constant ε′ are due to the presence of heterogeneity in the core-shell [22]. These heterogeneities are the interaction between the core (MgF) and the shell (ZnF or NiF) ferrites which give rise to space charge polarization and contribute to the dielectric constant.…”

Section: Dielectric Propertiesmentioning

confidence: 99%

“…Also, according to 'the larger grains possess a higher value of the dielectric constant' [33], the increase in grain size may be the reason for a significant increase in the dielectric constant, where the value of the grain size ZnF@MgF, and NiF@MgF samples is 36, and 159 nm, respectively [22]. Generally, the difference between the charge carriers in the grain interior and grain boundaries produces an interfacial polarization that may be causing the overall dielectric constant to increase [34][35][36].…”

Section: Dielectric Propertiesmentioning

confidence: 99%

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Effect of temperature on the dielectric and magnetic properties of NiFe₂O₄@MgFe₂O₄ and ZnFe₂O₄@MgFe₂O₄ core-shell

Roumaih¹

2021

Phys. Scr.

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The core-shell of nanoferrites showed quite different properties rather than the nanoferrites counterpart. The nanocomposites of NiFe2O4@MgFe2O4 (NiF@MgF) and ZnFe2O4@MgFe2O4 (ZnF@MgF) are chemically stable and showed very good dielectric and magnetic properties. In this investigation, the temperature-dependent dielectric constant, dielectric loss, and ac-electrical conductivity were measured up to 650 K under different alternating electric field frequencies from 100 Hz to 8 MHz. The obtained data revealed that the mutual effect between the core and the shell samples increases the space charge polarization. Also, the samples showed the semiconducting-metallic behavior which varies between SP, CBH, and QMT models according to the temperatures and the frequencies. Furthermore, the magnetization M(T) was studied of all samples using the Faraday balance method in the temperature range 300-500K. The experimental results of M(T) exhibit good magnetic properties of the core-shell samples, particularly the sample ZnF@MgF. The novelty in this work is an unexpected behavior of ZnF@MgF which possesses magnetization higher than the pure ferrite phase (MgFe2O4), and Curie temperature (TCm) higher than the room temperature. So, the sample ZnF@MgF is a ferrimagnetic substance. Besides, the effective magnetic moment (Eff) and the Curie-Weiss constant () for all samples were obtained from the magnetic susceptibility (T) protocols.

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Section: Introductionmentioning

confidence: 84%

Section: Dielectric Propertiesmentioning

confidence: 99%

Section: Dielectric Propertiesmentioning

confidence: 99%

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Effect of temperature on the dielectric and magnetic properties of NiFe₂O₄@MgFe₂O₄ and ZnFe₂O₄@MgFe₂O₄ core-shell

Roumaih¹

2021

Phys. Scr.

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“…To evaluate the heat e cacy of the sample with the alternating magnetic eld, a suspended solution of MF samples was prepared according to Ref. [10].…”

Section: Characterizationmentioning

confidence: 99%

“…The combination of two components with different physical properties leads to forming a new material with improved and useful properties and eliminated the disadvantages of each material compared to its components [9,10]. In this work, the multiferroic MF/CuAl synthesizes as a brand-new classi cation of nanocomposites.…”

Section: Introductionmentioning

confidence: 99%

Structural, Magnetic Properties and Hyperthermia Efficiency of MF/CuAl2O4 Multiferroic Nanocomposite

Roumaih

Abd-elrahem

Hussein

2021

Preprint

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The multiferroic MF/CuAl2O4 (MF= CoFe2O4, NiFe2O4, MgFe2O4, and ZnFe2O4) was prepared using two stages of the sol-gel method. X-ray Diffraction (XRD), the Fourier transforms infrared absorption (FT-IR) and High-resolution Transmission Electron Microscope (HR-TEM) were used to examine the structure of all samples. From the XRD patterns, two standards of cubic spinels structure (CuAl2O4 + MF) were observed. The analysis of FTIR spectra confirmed the formation of the chemical and molecular structure changes in the MF/CuAl2O4. HR-TEM images showed a uniform particle distribution with a nanoscale of all samples. The magnetic properties were studied from the hysteresis loops using a vibrating sample magnetometer (VSM) and the magnetization M (T) by the Faraday balance method. All samples exhibited typical ferrimagnetic behavior, except for ZnF/CuAl recorded superparamagnetic. Curie temperature (TC) for all nanocomposites obtained from M(T) protocols, which is lower than the standard value of MF nanoferrites. The heating efficiency of all samples was investigated by measuring the Specific Absorption Rate (SAR) parameter. The SAR of NiF/CuAl showed a maximum value as well as saturation magnetization (Ms) and lowest coercivity (Hc) value.

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Structural, optical, and magnetic properties of ferrite/oxide composites MgFe2O4/(1−x)MnO–xCdO

et al. 2022

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Synthesis and Characterization of Core–Shell NiFe2O4@MgFe2O4 and ZnFe2O4@MgFe2O4 Nanoferrites

Cited by 19 publications

References 47 publications

Effect of temperature on the dielectric and magnetic properties of NiFe₂O₄@MgFe₂O₄ and ZnFe₂O₄@MgFe₂O₄ core-shell

Effect of temperature on the dielectric and magnetic properties of NiFe₂O₄@MgFe₂O₄ and ZnFe₂O₄@MgFe₂O₄ core-shell

Structural, Magnetic Properties and Hyperthermia Efficiency of MF/CuAl2O4 Multiferroic Nanocomposite

Structural, optical, and magnetic properties of ferrite/oxide composites MgFe2O4/(1−x)MnO–xCdO

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Synthesis and Characterization of Core–Shell NiFe2O4@MgFe2O4 and ZnFe2O4@MgFe2O4 Nanoferrites

Cited by 19 publications

References 47 publications

Effect of temperature on the dielectric and magnetic properties of NiFe2O4@MgFe2O4 and ZnFe2O4@MgFe2O4 core-shell

Effect of temperature on the dielectric and magnetic properties of NiFe2O4@MgFe2O4 and ZnFe2O4@MgFe2O4 core-shell

Structural, Magnetic Properties and Hyperthermia Efficiency of MF/CuAl2O4 Multiferroic Nanocomposite

Structural, optical, and magnetic properties of ferrite/oxide composites MgFe2O4/(1−x)MnO–xCdO

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Effect of temperature on the dielectric and magnetic properties of NiFe₂O₄@MgFe₂O₄ and ZnFe₂O₄@MgFe₂O₄ core-shell

Effect of temperature on the dielectric and magnetic properties of NiFe₂O₄@MgFe₂O₄ and ZnFe₂O₄@MgFe₂O₄ core-shell