Synthesis, structural investigation, dielectric and magnetic properties of Zn2+-doped cobalt ferrite by the sol–gel technique

Hossain, Mohammad Sajjad; Alam, Md. Badiul; Shahjahan, M.; Begum, Most. Hosney Ara; Hossain, Md. Moazzem; Islam, S. S.; Khatun, Nazia; Hossain, M. Mofazzal; Alam, Mohammad Saiful; Al-Mamun, Md.

doi:10.1142/s2010135x18500303

Cited by 43 publications

(12 citation statements)

References 32 publications

(24 reference statements)

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“…10). These values show significant decrease compared to that obtained from the synthesis of zinc cobalt ferrite by Mohammad Sajjad Hossain et al [16] (HC=726.13 Oe). This reduction is attributed to the movement of Co 2+ ions to the tetrahedral position [3].…”

Section: Magnetic Propertiescontrasting

confidence: 53%

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Effect of pH Value on Synthesis and Properties of Zinc Cobalt Ferrite Nano Powders Prepared via Co-Precipitation Method

Shahbahrami¹,

Rabiee²,

Shidpoor³

2020

Preprint

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The effect of pH value on the synthesis of zinc cobalt ferrite nano powder via co-precipitation method was investigated. Zinc cobalt ferrite (Co0.6Zn0.4Fe2O4) precipitated using a solution of nitrate raw materials under different pHs (pH=8, 10, 11, 12 and 14) and calcined at 750 °C for 2 hours. The obtained nano-powders were characterized by X-ray diffraction (XRD), Williamson-Hall relations and Extrapolate functions, field emission scanning electron microscopy (FESEM) and vibrating sample magnetometer (VSM) measurements. The amount of pH had a significant effect on the structural and magnetic properties of the synthesized powders. At pHs 8 and 10, a tensile strain and above that a compressive strain was created in the system. By changing the tensile strain to compression the crystallite diameter increased, so that the crystallite diameter increased from 19.3 nm at pH 8 to 47.8 nm for pH =11. The HC of the all samples was in the range of 140-150 Oe. The saturation magnetization, anisotropy and Bohr magneton constants were 100.38 emu/gr, 15357.70 erg/Oe and 4.27, respectively for the synthesized sample at pH=11, which were higher than the other samples. These changes are due to the effect that pH has on the parameters of the crystallite diameter, particle size and also on the cation distribution of the ions in tetrahedral/octahedral spaces.

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Section: Magnetic Propertiescontrasting

confidence: 53%

“…. In addition, according to Wuhlfarth's theory, anisotropic constant (K) and magnetic moment (nB) for the formula unit are obtained by Equations(3)(4)(5)(6)(7)(8) and(3)(4)(5)(6)(7)(8)(9) [4,16,39]:…”

mentioning

confidence: 99%

Effect of pH Value on Synthesis and Properties of Zinc Cobalt Ferrite Nano Powders Prepared via Co-Precipitation Method

Shahbahrami¹,

Rabiee²,

Shidpoor³

2020

Preprint

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“…The resultant material had 70 nm crystallites with a saturation magnetization (Ms) of 86 emu/g. The sol-gel method is extensively used for the synthesis of spinel ferrites [50][51][52][53][54][55]. The process involves the transition of a system from a liquid phase (sol) to a solid phase (gel), through chemical reactions such as hydrolysis and condensation polymerization of the metallic precursors [25].…”

Section: Methods Of Synthesis Of Magnetic Spinel Ferritesmentioning

confidence: 99%

Removal of Organic Dyes from Water and Wastewater Using Magnetic Ferrite-Based Titanium Oxide and Zinc Oxide Nanocomposites: A Review

et al. 2021

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Heterogeneous photocatalysis using titanium dioxide (TiO2) and zinc oxide (ZnO) has been widely studied in various applications, including organic pollutant remediation in aqueous systems. The popularity of these materials is based on their high photocatalytic activity, strong photosensitivity, and relatively low cost. However, their commercial application has been limited by their wide bandgaps, inability to absorb visible light, fast electron/hole recombination, and limited recyclability since the nanomaterial is difficult to recover. Researchers have developed several strategies to overcome these limitations. Chief amongst these is the coupling of different semi-conductor materials to produce heterojunction nanocomposite materials, which are both visible-light-active and easily recoverable. This review focuses on the advances made in the development of magnetic ferrite-based titanium oxide and zinc oxide nanocomposites. The physical and magnetic properties of the most widely used ferrite compounds are discussed. The spinel structured material had superior catalytic and magnetic performance when coupled to TiO2 and ZnO. An assessment of the range of synthesis methods is also presented. A comprehensive review of the photocatalytic degradation of various priority organic pollutants using the ferrite-based nanocomposites revealed that degradation efficiency and magnetic recovery potential are dependent on factors such as the chemical composition of the heterojunction material, synthesis method, irradiation source, and structure of pollutant. It should be noted that very few studies have gone beyond the degradation efficiency studies. Very little information is available on the extent of mineralization and the subsequent formation of intermediate compounds when these composite catalysts are used. Additionally, potential degradation mechanisms have not been adequately reported.

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“…11From a closer look at the data, it is observed that έ diminution continuously with increasing frequency. All samples revealed dispersion due to Maxwell-Wagner interfacial polarization [34][35][36][37] The numbers of Fe 2+ ions on B sites, which participate in electron exchange interaction, are responsible for the polarization and maximum in case of cobalt ferrite. As the zinc, content in the mixed Co-Zn ferrites is continuously increased the number of ferrous ions on the B sites which are available for polarization decreases, resulting in a continuous decrement in the dielectric constant.…”

Section: Transport Propertiesmentioning

confidence: 99%

Structural Characteristics, Optical, Transport and Magnetic Properties of Zinc Doped Cobalt Chromium Ferrite Prepared by Co-precipitation Method

Moustafa

2020

Egypt. J. Chem.

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A SERIES of zinc doped cobalt chromium ferrite Co 1-x Zn x Fe 1.5 Cr 0.5 O 4 (where 0 £ x £ 1) were synthesized by co-precipitation technique. Structural, optical, transport and magnetic properties were characterized by X-ray diffraction (XRD), di-use reflectance, AC electrical properties and hysteresis loop. XRD analysis indicates that all samples consist of a single-phase cubic spinel structure. Rietveld refinement results indicated an increase in lattice parameter due to the replacement of Co 2+ by Zn 2+ and migration of Fe 3+ ions from A-site to B-site. Optical energy band gaps were calculated and it was found that both Eg1 and Eg2 increase with increasing Zn content. Dielectric constant έ, έ', and dielectric loss tangent tanδ were measured at room temperature as a function of applied frequency and temperature. It was noticed, that έ and έ' increase with temperature increment and decrease with increasing frequency and this anomaly can be explained by Maxwell Wagner two-layer model. Magnetic measurements revealed that the saturation magnetization increases as Zn content increases up to Zn=0.4 and after that, the saturation magnetization decreases.

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Synthesis, structural investigation, dielectric and magnetic properties of Zn2+-doped cobalt ferrite by the sol–gel technique

Cited by 43 publications

References 32 publications

Effect of pH Value on Synthesis and Properties of Zinc Cobalt Ferrite Nano Powders Prepared via Co-Precipitation Method

Effect of pH Value on Synthesis and Properties of Zinc Cobalt Ferrite Nano Powders Prepared via Co-Precipitation Method

Removal of Organic Dyes from Water and Wastewater Using Magnetic Ferrite-Based Titanium Oxide and Zinc Oxide Nanocomposites: A Review

Structural Characteristics, Optical, Transport and Magnetic Properties of Zinc Doped Cobalt Chromium Ferrite Prepared by Co-precipitation Method

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