Magnetic and microwave absorption properties of Ni1−x Zn x Fe2O4 nanocrystalline synthesized by sol-gel method

Zhang, Min; Liu, Qiangchun; Zi, Zhenfa; Dai, Ying; Zhu, Xuebin; Sun, Yan; Dai, Jianming

doi:10.1007/s11431-012-5057-5

Cited by 21 publications

(23 citation statements)

References 32 publications

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“…It was observed that with increasing temperature, the lattice parameter, the network microdeformation and the cell volume decrease, and the material density increase, a result that agrees with Saba et al [32] Zhang et al [43] and Mouallem-Bahout et al [31], who calcined Ni-Zn ferrite at 800°C for 240 min, 900°C for 120 min, and 650°C for 900 min, respectively. Figure 2 shows the thermal analysis of Ni-Zn ferrite precursor powders.…”

Section: Resultssupporting

confidence: 79%

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Rapid calcination of ferrite Ni0.75Zn0.25Fe2O4 by microwave energy

Assis¹,

Bomio²,

Nascimento³

et al. 2014

J Therm Anal Calorim

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Ferrites Ni 0.75 Zn 0.25 Fe 2 O 4 were obtained by polymeric precursor method and calcined in a short time with microwave energy to assess the morphological and microstructural characteristics. Samples were calcined at 500, 650, 800, and 950°C for 30 min in a microwave oven. The resulting powders were characterized by thermal analysis (TG/DSC), X-ray diffraction (XRD), Fourier transform infrared spectrometer, field-emission gun scanning electron microscope (FEG-SEM), and energy-dispersive X-ray spectroscopy. The XRD results showed the formation of single ferrite phase at temperature of 500°C for 30 min. The FEG-SEM analysis showed agglomerated particles with formation of non-dense longitudinal plates, with interparticle porosity and agglomerated fine particles. The rapid calcination by microwave energy demonstrated satisfactory results in relatively low temperature of 500°C for 30 min and appeared to be a promising technique for obtaining nickel-zinc ferrite powders.

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Section: Resultssupporting

confidence: 79%

“…The reaction of Zn with oxygen and the relationship between the partial Zn and O 2 pressures can be understood by the following expression (Eq. 4) [39]: [32,42,43]. Table 2 shows a tendency of increasing the average crystallite size with increasing calcination temperature.…”

Section: Resultsmentioning

confidence: 99%

Rapid calcination of ferrite Ni0.75Zn0.25Fe2O4 by microwave energy

Assis¹,

Bomio²,

Nascimento³

et al. 2014

J Therm Anal Calorim

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show abstract

“…At low concentration of Zn 2+ ions, spin site occupancy reduces at A (tetrahedral) sites due to the presence of non-magnetic Zn 2+ ions, however, net magnetization increases due to the shift of Fe 3+ ions from A site to B (octahedral) sites. The increase in Zn 2+ substitution beyond x = 0.5 resulted in the reduced effective spin A site contributions due to the non-availability of the minimum number of spins sites for the oxygen mediated super-exchange interaction between A and B cation sites, leading to decrease in magnetization value, as observed in the present study1737. Moreover, the annealing temperature has favored grain growth, resulting in the enhanced number of domain walls or even larger domains within the grains.…”

Section: Resultssupporting

confidence: 57%

“…The existence of such two matching frequencies has been observed earlier in pure ferrite powders, however, in rubber-ferrite composite samples only a single matching frequency has been reported3745. The two possible MW absorption loss mechanism are generally attributed in ferrite materials: (i) relaxation mechanism due to the domain wall motion and (ii) the spin rotational resonance.…”

Section: Resultsmentioning

confidence: 85%

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Tunable Twin Matching Frequency (fm1/fm2) Behavior of Ni1−xZnxFe2O4/NBR Composites over 2–12.4 GHz: A Strategic Material System for Stealth Applications

Saini

Patra

Jani

et al. 2017

Sci Rep

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The gel to carbonate precipitate route has been used for the synthesis of Ni1−xZnxFe2O4 (x = 0, 0.25, 0.5 and 0.75) bulk inverse spinel ferrite powder samples. The optimal zinc (50%) substitution has shown the maximum saturation magnetic moment and resulted into the maximum magnetic loss tangent (tanδm) > −1.2 over the entire 2–10 GHz frequency range with an optimum value ~−1.75 at 6 GHz. Ni0.5Zn0.5Fe2O4- Acrylo-Nitrile Butadiene Rubber (NBR) composite samples are prepared at different weight percentage (wt%) of ferrite loading fractions in rubber for microwave absorption evaluation. The 80 wt% loaded Ni0.5Zn0.5Fe2O4/NBR composite (FMAR80) sample has shown two reflection loss (RL) peaks at 5 and 10 GHz. Interestingly, a single peak at 10 GHz for 3.25 mm thickness, can be scaled down to 5 GHz by increasing the thickness up to 4.6 mm. The onset of such twin matching frequencies in FMAR80 composite sample is attributed to the spin resonance relaxation at ~5 GHz (fm1) and destructive interference at λm/4 matched thickness near ~10 GHz (fm2) in these composite systems. These studies suggest the potential of tuning the twin frequencies in Ni0.5Zn0.5Fe2O4/NBR composite samples for possible microwave absorption applications.

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Dimensional Design and Core–Shell Engineering of Nanomaterials for Electromagnetic Wave Absorption

et al. 2022

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Herein, the advances in low-dimensional core-shell EM wave absorption materials are outlined and a selection of the most remarkable examples is discussed. The derived key information regarding dimensional design, structural engineering, performance, and structure-function relationship are comprehensively summarized. Moreover, the investigation of the cuttingedge mechanisms is given particular attention. Additional applications, such as oxidation resistance and self-cleaning functions, are also introduced. Finally, insight into what may be expected from this rapidly expanding field and future challenges are presented.

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Magnetic and microwave absorption properties of Ni1−x Zn x Fe2O4 nanocrystalline synthesized by sol-gel method

Cited by 21 publications

References 32 publications

Rapid calcination of ferrite Ni0.75Zn0.25Fe2O4 by microwave energy

Rapid calcination of ferrite Ni0.75Zn0.25Fe2O4 by microwave energy

Tunable Twin Matching Frequency (fm1/fm2) Behavior of Ni1−xZnxFe2O4/NBR Composites over 2–12.4 GHz: A Strategic Material System for Stealth Applications

Dimensional Design and Core–Shell Engineering of Nanomaterials for Electromagnetic Wave Absorption

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