Micro Raman, Mossbauer and magnetic studies of manganese substituted zinc ferrite nanoparticles: Role of Mn

Suneetha, T.; Kashyap, Subhash C.; Sharma, Shiv K.; Reddy, V. Raghavendra

doi:10.1016/j.jpcs.2015.12.013

Cited by 115 publications

(29 citation statements)

References 45 publications

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“…This was already described by Thota et al . for mixed Zn x Mn 1‐x Fe 2 O 4 . In contrast, as already mentioned, calcination at elevated temperatures (Figure S5 SI) leads to the formation of secondary phases.…”

Section: Resultsmentioning

confidence: 60%

Mesoporous ZnFe₂O₄ Photoanodes with Template‐Tailored Mesopores and Temperature‐Dependent Photocurrents

Kirchberg

Wang

et al. 2018

ChemPhysChem

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Mesoporous ZnFe O photoanodes have been prepared via dip-coating utilizing the evaporation-induced self-assembly of two different block-copolymer templates to investigate the influence of pore geometry on the photoelectrochemcial performance of those earth-abundant photoelectrodes. The use of commercial block copolymers, triblock copolymer Pluronic F127 and the diblock copolymer PIB3000 as templates, leads to different pore morphologies under identical preparation conditions due to different polymer stabilities. Interestingly, pore morphology in mesoporous ZnFe O turned out to be less important for the photoelectrochemical performance. Contrary, sufficiently developed crystalline domains gained through optimized temperature treatment resulted in maximum photoelectrochemical performance among the investigated samples. This disproves the necessity of expensive, tailor-made polymer soft templates to synthesize high-performing mesoporous ZnFe O photoanodes.

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Section: Resultsmentioning

confidence: 60%

Mesoporous ZnFe₂O₄ Photoanodes with Template‐Tailored Mesopores and Temperature‐Dependent Photocurrents

Kirchberg

Wang

et al. 2018

ChemPhysChem

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“…EPR is an outstanding spectroscopic technique to examine the dynamical magnetic properties at higher frequencies. Magnetic parameters like super-exchange interactions, magnetic anisotropy, spin-spin relaxation, and dipolar interactions govern the magnetic behavior , H C , M R , K, S, and η B calculated O 4 (x = 0.3, 0.4, 0.5, 0.6, and 0.7 of NPs which are in turn explained by studying the Lande's g-factor, resonance field (H r ), and linewidth (∆H PP ) [44][45][46]. The EPR spectrum measurements for Mg 1-x Zn x Fe 2 O 4 ferrite NPs were made at a constant microwave frequency of 9.8 GHz in the field range of 0-10,000 G at RT.…”

Section: Epr Analysismentioning

confidence: 99%

“…Priyadarshini et al [35] reported a similar increase in linewidth with saturation magnetization for Ni-Zn ferrites. Moreover, the linewidth is also considered to be a measure of field inhomogeneity in the material, and a decrease in ∆H PP values after x = 0.5 can be due to the improved magnetic homogeneity in the particles [36,44]. Table 8 shows the experimental values of the magnetic moment (μ B ) and noted to increase with Zn substitution till x = 0.5.…”

Section: Epr Analysismentioning

confidence: 99%

Zn2+ substituted superparamagnetic MgFe2O4 spinel-ferrites: Investigations on structural and spin-interactions

2020

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Nano-magnetic ferrites with composition Mg1−xZnxFe2O4 (x = 0.3, 0.4, 0.5, 0.6, and 0.7) have been prepared by coprecipitation method. X-ray diffraction (XRD) studies showed that the lattice parameter was found to increase from 8.402 to 8.424 Å with Zn2+ ion content from 0.3 to 0.7. Fourier transform infrared (FTIR) spectra revealed two prominent peaks corresponding to tetrahedral and octahedral at around 560 and 430 cm−1 respectively that confirmed the spinel phase of the samples. Transmission electron microscopy (TEM) images showed that the particle size was noted to increase from 18 to 24 nm with an increase in Zn content from x = 0.3 to 0.7. The magnetic properties were studied by vibrating sample magnetometer (VSM) and electron paramagnetic resonance (EPR) which ascertained the superparamagnetic behavior of the samples and contribution of superexchange interactions. The maximum magnetization was found to vary from 23.80 to 32.78 emu/g that increased till x = 0.5 and decreased thereafter. Further, X-ray photoelectron spectroscopy (XPS) was employed to investigate the chemical composition and substantiate their oxidation states.

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“…3, have similar broad Raman peaks centered at around 330, 480, and 660 cm -1 , which are associated with Eg, T2g(2) and A1g modes of standard spinel structure ZnFe 2 O 4 [13][14][15]. The Eg band is due to symmetric bending of Fe-O bonds with peak around 250-360 cm -1 , and T2g(2) band is from the asymmetric stretch of Fe-O bonds with peak around 450-520 cm -1 [16]. The broadening of peaks due to the small particle size was observed.…”

Section: Resultsmentioning

confidence: 82%

Functionalization of zinc ferrite nanoparticles: Influence of modification procedure on colloidal stability

Milanović

Stijepović

Pavlović³

et al. 2016

PAC

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The present work describes the synthesis of zinc ferrite nanoparticles by a chemical coprecipitation method and its surface modification with poly(diallyldimethylammonium chloride) (PDDA), tetramethylammonium hydroxide (TMAOH) and poly(ethylene glycol) (PEG). The effect of coating on the colloidal stability of obtained systems as well as the effect of modification procedure on the final characteristics of particles were studied. The unmodified and modified nanoparticles were characterized by X-ray diffractometry (XRD), scanning electron microscopy (SEM) and Raman spectroscopy. The particle size distribution and stability of these systems were investigated by dynamic light scattering (DLS) and zeta potential measurements. The results have shown the profound effect of the used modification procedure on colloidal stability of the investigated particles.

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Micro Raman, Mossbauer and magnetic studies of manganese substituted zinc ferrite nanoparticles: Role of Mn

Cited by 115 publications

References 45 publications

Mesoporous ZnFe₂O₄ Photoanodes with Template‐Tailored Mesopores and Temperature‐Dependent Photocurrents

Mesoporous ZnFe₂O₄ Photoanodes with Template‐Tailored Mesopores and Temperature‐Dependent Photocurrents

Zn2+ substituted superparamagnetic MgFe2O4 spinel-ferrites: Investigations on structural and spin-interactions

Functionalization of zinc ferrite nanoparticles: Influence of modification procedure on colloidal stability

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Micro Raman, Mossbauer and magnetic studies of manganese substituted zinc ferrite nanoparticles: Role of Mn

Cited by 115 publications

References 45 publications

Mesoporous ZnFe2O4 Photoanodes with Template‐Tailored Mesopores and Temperature‐Dependent Photocurrents

Mesoporous ZnFe2O4 Photoanodes with Template‐Tailored Mesopores and Temperature‐Dependent Photocurrents

Zn2+ substituted superparamagnetic MgFe2O4 spinel-ferrites: Investigations on structural and spin-interactions

Functionalization of zinc ferrite nanoparticles: Influence of modification procedure on colloidal stability

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Mesoporous ZnFe₂O₄ Photoanodes with Template‐Tailored Mesopores and Temperature‐Dependent Photocurrents

Mesoporous ZnFe₂O₄ Photoanodes with Template‐Tailored Mesopores and Temperature‐Dependent Photocurrents