Synthesis of Bi3+ substituted Ni-Cu ferrites and study of structural, electrical and magnetic properties

Chavan, Pradeep; Naik, L. R.; Belavi, P. B.; Chavan, G. N.; Kotnala, R. K.

doi:10.1016/j.jallcom.2016.10.034

Cited by 32 publications

(5 citation statements)

References 19 publications

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“…. The linear increase of AC conductivity with increase in frequency was due to the polaron type of conduction mechanism in ferrites . There are two types of polarons, namely, small polarons and large polarons.…”

Section: Resultsmentioning

confidence: 99%

Investigation of energy band gap and conduction mechanism of magnesium substituted nickel ferrite nanoparticles

Chavan

Naik

2017

Phys. Status Solidi A

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Polycrystalline ferrite nanoparticles having the general formula Ni 1Àx Mg x Fe 2 O 4 (in which magnesium content x ¼ 0.0, 0.1, 0.2, 0.3, 0.4, and 0.5) were synthesized by auto combustion method. The formation of cubic spinel structure of Mg substituted nickel ferrites were confirmed by X-ray diffraction (XRD) measurement with the space group of Fd 3m -O h 7 . The average particle size of the ferrites was determined by Scherrer formula; ranging from 41.41 to 45.93 nm. The lattice constant increases with increase in Mg concentration. The porosity of the ferrite samples was estimated using Hendricks and Adam's method; the porosity found to increase with an increase in Mg concentration. The decrease of DC electrical resistivity with an increase in temperature indicates the semiconducting nature of the ferrites. The decrease of dielectric constant with an increase in frequency was due to the hopping of free and localized electric charge carriers. The energy band gap of the ferrite nanoparticles were determined by Tauc plot and it was found to increase with an increase in Mg concentration (2.84 to 2.94 eV).

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Section: Resultsmentioning

confidence: 99%

Investigation of energy band gap and conduction mechanism of magnesium substituted nickel ferrite nanoparticles

Chavan

Naik

2017

Phys. Status Solidi A

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“…As a result, the utmost sensitivity factor S f = 1275.64 was obtained for Li 0.5 Co 0.5 Fe 2 O 4 nanoparticles. Hence, the sensitivity factor of ferrite nanoparticles is high for the Li 0.5 Co 0.5 Fe 2 O 4 composition; it is because of the smaller grains, less porosity, and lower surface charge, i.e., advantageous for the top humidity-sensing property of the ferrite nanoparticles. ,, …”

Section: Resultsmentioning

confidence: 99%

Chemisorption and Physisorption of Water Vapors on the Surface of Lithium-Substituted Cobalt Ferrite Nanoparticles

Chavan¹

2021

ACS Omega

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Ferrimagnetic materials have the assembly of n-type porous semiconductors that shows the evidence of several physical properties used in electronic devices and technology. If the water vapors are brought closer to the surface of n-type semiconductors, then the electrons near the surface of materials are transferred from the conduction band to the electron-accepting level of the water molecule that provides chemisorbed layer of OH– ions. The conduction of electrons takes place only when H3O+ releases one proton to the nearest water molecule that accepts electrons while releasing another proton and so on. This mechanism is known as the Grotthuss chain reaction; it is the essential conduction mechanism of water and surface layers of water on the humidity-sensitive semiconducting materials. In this article, the humidity-sensing properties of Li-substituted cobalt ferrite nanoparticles prepared by the solution combustion method are reported. The result of the data suggested that the substitution of Li ions improved the formation of smaller grains of cobalt ferrite, which results in a rise within the surface area and improved the humidity sensitivity of ferrite nanoparticles.

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“…The values of the lattice parameter a , determined through Rietveld refinement analysis, are also presented in Table . The crystallite size in all the prepared samples was calculated using the full width at half-maximum of the most intense peak (311) from the line broadening analysis and equation, generally known as the Debye–Scherrer equation D = K λ β .1em cos .1em θ where D , K , λ, β, and θ all have their useful meanings. The calculated values of crystallite size are summarized in Table .…”

Section: Resultsmentioning

confidence: 99%

Nanostructured Bi³⁺-Modified Ferrites: Magnetically Separable and Recyclable Catalysts for Sustainable Water Resource Management through Dye Degradation and Nitrophenol Reduction

Singh,

Singh

2024

ACS Sustainable Resour. Manage.

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Ongoing research emphasizes the vital role of advanced scientific knowledge in addressing complex wastewater management challenges. Efficient catalysts for degrading pollutants like nitrophenols and organic dyes are crucial for sustainable water quality, resource preservation, and cost-effective solutions. Herein, highly stable and magnetically recoverable Bi 3+ -doped Ni−Cu−Cr quinary spinel ferrite nanoparticles, synthesized using sol−gel technology, were proposed as heterogeneous nanocatalysts for removing pollutants like nitrophenols and dyes from wastewater. The optical band gap values obtained from DRS lies in the visible range (1.35−1.60 eV) making them suitable and reliable photocatalysts. The augmentation in BET surface area observed with the escalating Bi 3+ doping levels signifies an increased availability of active sites conducive to facilitating reactions. Moreover, all the Ni−Cu−Cr ferrites show tremendous results in the reduction of 4-NP and photocatalytic degradation of RhB, but the BF-4 nanocatalyst exhibits the best results among all the other catalysts (reduction of 4-NP and degradation of RhB was 99% completed in 21 and 40 min, respectively). Considering the above fascinating results, we have also extended our scope of work for the reduction of 2-NP, 3-NP, and 2,4,6-TNP and degradation of MB, MO, and a mixture of all organic dyes, i.e., RhB + MB + MO. It was observed that BF-4 swiftly reduces as well as degrades all types of pollutants in the shortest period of time confirming the versatility of our BF-4 nanocatalyst. Moreover, we delved into the degradation mechanism of dyes by investigating the impact of active species, including O 2 −• and OH • through scavenging experiments, and as a result, OH • was identified as the main contributor to the degradation of dyes. As indicated by the VSM studies, the BF-4 nanocatalyst was easily recoverable using an external magnet and can be used again for recycling reactions. In the context of wastewater management and water resource preservation, our Bi 3+ -doped Ni−Cu−Cr quinary ferrites stand out as ideal candidates. Their exceptional stability and robust catalytic activity make them a top choice for effectively removing and degrading a wide range of pollutants, contributing to the improvement of water quality and the sustainable management of water resources.

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Synthesis of Bi3+ substituted Ni-Cu ferrites and study of structural, electrical and magnetic properties

Cited by 32 publications

References 19 publications

Investigation of energy band gap and conduction mechanism of magnesium substituted nickel ferrite nanoparticles

Investigation of energy band gap and conduction mechanism of magnesium substituted nickel ferrite nanoparticles

Chemisorption and Physisorption of Water Vapors on the Surface of Lithium-Substituted Cobalt Ferrite Nanoparticles

Nanostructured Bi³⁺-Modified Ferrites: Magnetically Separable and Recyclable Catalysts for Sustainable Water Resource Management through Dye Degradation and Nitrophenol Reduction

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Synthesis of Bi3+ substituted Ni-Cu ferrites and study of structural, electrical and magnetic properties

Cited by 32 publications

References 19 publications

Investigation of energy band gap and conduction mechanism of magnesium substituted nickel ferrite nanoparticles

Investigation of energy band gap and conduction mechanism of magnesium substituted nickel ferrite nanoparticles

Chemisorption and Physisorption of Water Vapors on the Surface of Lithium-Substituted Cobalt Ferrite Nanoparticles

Nanostructured Bi3+-Modified Ferrites: Magnetically Separable and Recyclable Catalysts for Sustainable Water Resource Management through Dye Degradation and Nitrophenol Reduction

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Product

Resources

About

Nanostructured Bi³⁺-Modified Ferrites: Magnetically Separable and Recyclable Catalysts for Sustainable Water Resource Management through Dye Degradation and Nitrophenol Reduction