Effect of Ni concentration on electromagnetic wave absorption of (Ni,Mn,Zn)Fe2O4/resin particulate composites

Ni x Zn 0.9−x Mn 0.1 Fe 2 O 4 (0.3 ≤ x ≤ 0.7) ferrites were synthesized using the conventional ceramic processing method. A 1 wt% B 2 O 3 was added to initial mixture to inhibit crystal growth and to decrease phase formation temperature. The structural, magnetic, dielectric, and microwave properties of samples have been investigated using X-ray diffraction (XRD), scanning electron microscope (SEM), vibrating sample magnetometer (VSM), and near-field microwave measurements in RF Impedance Analyzer. Magnetization measurements revealed that saturation magnetization of the Mn-substituted Ni-Zn ferrite increases as nickel concentration increases up to x = 0.6. The saturation magnetization has the highest value of 78 emu/g in the Ni 0.6 Zn 0.3 Mn 0.1 Fe 2 O 4 sample. All samples have negligible coercive fields of few oersteds. Microwave measurements revealed that ferromagnetic resonance occurs at around 1.8 GHz and minimum reflection loss attained is less than −20 dB with sample thickness of 10 mm. The observed resonance is due to the domain wall motion. As a result, these materials can be used in microwave absorbers in low-frequency range (i.e., 0.1-3 GHz) as magnetic fillers.

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“…Our results are in parallel with that of Ref. [6], in which Ni 0.5x Mn 0.5−0.5x Zn 0.5 Fe 2 O 4 were used and minimum RL was obtained at 2.3 GHz.…”

Section: Microwave Absorptionsupporting

confidence: 89%

Magnetic and Microwave Absorption Properties of Ni x Zn0.9−x Mn0.1Fe2 O 4 Prepared by Boron Addition

Genç

Turhan

Kavas

et al. 2014

J Supercond Nov Magn

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“…This difference might be as a result of the absence of real values for M s of the synthesized nanopowders. Also the presence of antiferromagnetic hematite phase could decrease the M s values [34]. In addition, as mentioned before, the calculated M s values with MAUD software are rough approximations and are not exact values.…”

Section: Resultsmentioning

confidence: 92%

“…The coercivity of this sample is reduced from 175.5 to 127Oe after calcination at 1000°C which should be as a result of stress relief. Also the presence of antiferromagnetic hematite and NiO phases affects i H c values [34,37]. Antiferromagnetic phases possess antiparallel spin-canted configurations, and their net magnetizations nearly approach zero.…”

Section: Resultsmentioning

confidence: 99%

Effect of fuel-to-oxidant ratio on phase constituents, microstructure and magnetic properties of NiFe2O4-based composite nanopowder synthesized by sol–gel auto-combustion method

Alamolhoda

Mirkazemi

Benvidi

et al. 2015

J Sol-Gel Sci Technol

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In this research, NiFe 2 O 4 -based composite nanopowder with 0.8, 1, 1.35, 1.7 fuel-to-oxidant (F/O) ratios was synthesized by sol-gel auto-combustion method. Changes in phase constituents, microstructure and magnetic properties due to changes in F/O ratios were evaluated by X-ray diffraction (XRD), Raman spectroscopy, field emission scanning electron microscope (FESEM) and vibrating sample magnetometer (VSM) techniques. XRD and Raman spectroscopy results show the presence of NiFe 2 O 4 , FeNi 3 , a-Fe 2 O 3 and NiO phases. The amount of nickel ferrite was increased, while the amount of FeNi 3 was decreased with increasing F/O ratio from 0.8 to 1.35. Mean crystallite sizes of the samples are in the range of 40-46 nm. FESEM studies depicted the formation of NiFe 2 O 4 particles coexisting with FeNi 3 phase. Changes in F/O ratios alter the saturation magnetization values from 37 to 60 emu/g as a result of changes in FeNi 3 and NiFe 2 O 4 amounts. Coercivity values are in the range of 135-177Oe. Graphical Abstract In this research nano-sized NiFe 2 O 4 powders with 0.8, 1, 1.35, 1.7 Fuel to Oxidant (F/O) ratios were synthesized by sol-gel auto-combustion method. FESEM studies depicted the formation of NiFe 2 O 4 particles coexisting with FeNi 3 phase. Changes in F/O ratios alter the saturation magnetization values from 37 to 60emu/g as a result of changes in FeNi 3 and NiFe 2 O 4 amounts. Coercivity values are in the range of 135 to 177Oe.

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“…Numbers of research groups have explored EM absorbing characteristics of several types of nanomaterials such as SiC, Mn 2 O 3 , graphene, carbon nanotubes (CNTs) and ZnO nanomaterials [6][7][8][9][10][11][12]. Composites of these nanomaterials with other polymer and metal oxides have also been explored in this perspective [13][14][15]. The reported results correspond to samples where both phases are simultaneously grown, such as SrFe 12 shells.…”

Section: Introductionmentioning

confidence: 99%

Structural, magnetic and electromagnetic wave absorption properties of WO3–CuFe2O4: a novel nanocomposite

Ali

Jan

Iqbal

et al. 2017

J Mater Sci: Mater Electron

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Effect of Ni concentration on electromagnetic wave absorption of (Ni,Mn,Zn)Fe2O4/resin particulate composites

Cited by 38 publications

References 31 publications

Magnetic and Microwave Absorption Properties of Ni x Zn0.9−x Mn0.1Fe2 O 4 Prepared by Boron Addition

Magnetic and Microwave Absorption Properties of Ni x Zn0.9−x Mn0.1Fe2 O 4 Prepared by Boron Addition

Effect of fuel-to-oxidant ratio on phase constituents, microstructure and magnetic properties of NiFe2O4-based composite nanopowder synthesized by sol–gel auto-combustion method

Structural, magnetic and electromagnetic wave absorption properties of WO3–CuFe2O4: a novel nanocomposite

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