Chemical synthesis and magnetic investigations on Cr3+ substituted Zn-ferrite superparamagnetic nano-particles

Kumari, Naveen; Kumar, Vinod; Khasa, Satish; Singh, Satbir

doi:10.1016/j.ceramint.2014.09.118

Cited by 27 publications

(17 citation statements)

References 26 publications

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“…Consequently, the first term in Eq. (38) becomes very small, and the second term dominates. At x = 0.5, magnetization has the maximum value and hence, ∆H PP and g-factor are the maximum.…”

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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Section: Epr Analysismentioning

confidence: 99%

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

2020

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“…) are the most versatile materials because of their wide range of technological applications in various areas such as biomedicine, magnetic resonance imaging, data storage, microwave absorbance, magnetic fluids, catalysis multilayer chip inductor, electromagnetic interference (EMI) suppression, gas sensing, transformer cores, antenna rods, inductors, deflection yokes, recording heads, magnetic amplifiers, radio frequency circuits, high-quality filters, rod antennas, power transformer in electronics, read/write heads for high-speed digital tapes, etc. (Kumari et al 2015;Dumitrescu et al 2014;Elsayed and Saba 2009;Rashad et al 2009;Lokhande et al 2007). Furthermore, the electronic, telecommunication, lighting, energetic, and automobile industries are quickly developing nowadays and cannot be imagined without ferrite products anymore (Rashad and Ibrahim 2012).…”

Section: Introductionmentioning

confidence: 99%

The effect of solution pH on the electrochemical performance of nanocrystalline metal ferrites MFe2O4 (M=Cu, Zn, and Ni) thin films

et al. 2015

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Nanocrystalline metal ferrite MFe 2 O 4 (M=Cu, Zn, and Ni) thin films have been synthesized via electrodeposition-anodization process. Electrodeposited (M)Fe 2 alloys were obtained from aqueous sulfate bath. The formed alloys were electrochemically oxidized (anodized) in aqueous (1 M KOH) solution, at room temperature, to the corresponding hydroxides. The parameters controlling the current efficiency of the electrodeposition of (M)Fe 2 alloys such as the bath composition and the current density were studied and optimized. The anodized (M)Fe 2 alloy films were annealed in air at 400°C for 2 h. The results revealed the formation of three ferrite thin films were formed. The crystallite sizes of the produced films were in the range between 45 and 60 nm. The microstructure of the formed film was ferrite type dependent. The corrosion behavior of ferrite thin films in different pH solutions was investigated using open circuit potential (OCP) and potentiodynamic polarization measurements. The open circuit potential indicates that the initial potential E im of ZnFe 2 O 4 thin films remained constant for a short time, then sharply increased in the less negative direction in acidic and alkaline medium compared with Ni and Cu ferrite films. The values of the corrosion current density I corr were higher for the ZnFe 2 O 4 films at pH values of 1 and 12 compared with that of NiFe 2 O 4 and CuFe 2 O 4 which were higher only at pH value 1. The corrosion rate was very low for the three ferrite films when immersion in the neutral medium. The surface morphology recommended that Ni and Cu ferrite films were safely used in neutral and alkaline medium, whereas Zn ferrite film was only used in neutral atmospheres.

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“…The VSM data are used to extract the magnetic parameters such as saturation magnetization M S , retentivity M r and coercivity H C . These values are further used to calculate the squareness ratio S, anisotropy constant K and magnetic moment η B [ 58 ]. The obtained values are presented in Table 2 .…”

Section: Resultsmentioning

confidence: 99%

Investigation on anneal-tuned properties of ZnFe2O4 nanoparticles for use in humidity sensors

2021

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The effect of different annealing temperatures on structural, optical and magnetic properties of ZnFe 2 O 4 nanoparticles prepared using the coprecipitation technique has been investigated. With the increase in annealing temperature, crystallinity and average crystallite size of nanoparticles increased. The average crystallite size was found to be 5.55 nm, 6.62 nm and 32.9 nm for the samples annealed at 300 °C, 500 °C and 700 °C, respectively. The X-ray diffraction and Fourier-transform infrared spectroscopy revealed the formation of a cubic spinel structure. The optical direct and indirect bandgap energy decreased with an increase in annealing temperature. The saturation magnetization increased from 16.38 emu/g to 25.91 emu/g. The M-H curves depicted the magnetic phase transition from superparamagnetic to ferrimagnetic. The electrical properties were investigated using an impedance analyzer in the frequency range of 300 Hz to 1 MHz. The conduction properties showed enhancement with increased annealing. The humidity sensing properties were investigated in the range of 15-90% RH and revealed a strong dependence of adsorption capacity on the annealing temperature. Electrical conductivity improved with increased humidity. Excellent humidity sensitivity was observed for ferrites annealed at 700 °C attributed to increased crystallinity and reduced lattice strain making them a potential candidate for use in humidity sensors.

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Chemical synthesis and magnetic investigations on Cr3+ substituted Zn-ferrite superparamagnetic nano-particles

Cited by 27 publications

References 26 publications

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

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

The effect of solution pH on the electrochemical performance of nanocrystalline metal ferrites MFe2O4 (M=Cu, Zn, and Ni) thin films

Investigation on anneal-tuned properties of ZnFe2O4 nanoparticles for use in humidity sensors

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