Substitutional effect of Cr3+ ions on the properties of Mg–Zn ferrite nanoparticles

Haralkar, S.J.; Kadam, R.H.; More, S.S.; Shirsath, Sagar E.; Mane, Maheshkumar L.; Patil, Swati; Mane, D.R.

doi:10.1016/j.physb.2012.07.030

Cited by 89 publications

(30 citation statements)

References 31 publications

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“…The calculated values of d X are 4.39, 4.42 and 4.43 g/cm 3 for the un-templated, boiled ESM templated and fresh ESM templated, respectively (Table 1). These values are almost the same and are in good agreement with the reported value of 4.43 g/cm 3 for MgCr 2 O 4 prepared by co-crystallization method (Haralkar et al 2012). The specific surface area (S) of the 1000°C annealed samples were calculated with the help of X-ray density (d X ) and average crystallite size (t) in accordance with the following expression (Hamed et al 2016)…”

Section: Heat Treatmentssupporting

confidence: 91%

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Synthesis of nanostructured pirochromite magnesium chromate with egg shell membrane template

Ramachandran

Hamed

2016

Appl Nanosci

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In this work, we report on the use of fresh and boiled egg shell membrane as bio-templates in the coprecipitation of pirochromite. The structure evolution, microstructure and optical properties of the ESM templated MgCr 2 O 4 nanomaterial were studied by X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, Energy dispersive X-ray spectroscopy, elemental mapping and UV-Vis-NIR spectrophotometry. The annealing of the untemplated and templated co-precipitated MgCr 2 O 4 powders at 1000°C for 4 h produced single phased nanostructured material with spinel cubic crystal structure. The FTIR results showed slight variations in the band positions m 1 and m 2 which are attributed to the change in the microstructure due to the introduction of ESM in the preparation of MgCr 2 O 4 . The morphologies and average crystallite size of the annealed MgCr 2 O 4 nanocrystalline powders depended on the type of the template. 3D hierarchical flake-like and mesh like structures were observed. The annealed MgCr 2 O 4 nanocrystalline powders have shown excitonic absorptions in the visible range 300-500 nm due to the transitions that took place from the O-2p level to the Cr-3d level. The optical band gap energies were found to be 3.68-3.71 eV for the direct band gap and 3.30-3.37 eV for the indirect band gap. This could make these MgCr 2 O 4 nanocrystalline powders possible photocatalysts in the visible range 300-500 nm.

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Section: Heat Treatmentssupporting

confidence: 91%

“…where k is the X-ray wave length (1.5405 9 10 -10 m), (Haralkar et al 2012). The X-ray density (d X ) of the 1000°C annealed untemplated, boiled ESM templated and fresh ESM templated MgCr 2 O 4 nanocrystalline powders were determined from the following simple relation (Hamed et al 2016).…”

Section: Heat Treatmentsmentioning

confidence: 99%

Synthesis of nanostructured pirochromite magnesium chromate with egg shell membrane template

Ramachandran

Hamed

2016

Appl Nanosci

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“…In addition, the crystallite size tended to decrease with increasing Gd content because of the inhibition of grain growth due to the incorporation of Gd 3? ions into the ferrite structure (Haralkar et al 2012). However, when y = 0.06, the Gd-substituted Zn ferrite Figure 5 shows the typical temperature profiles of the magnetic fluids containing the Mg 0.5 Zn 0.5 Gd y Fe 2-y O 4 nanoparticles.…”

Section: Resultsmentioning

confidence: 99%

Synthesis and magnetic induction heating properties of Gd-substituted Mg–Zn ferrite nanoparticles

2017

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Gadolinium-substituted magnesium-zinc ferrite (Mg x Zn 1-x Gd y Fe 2-y O 4 ) nanoparticles with different metal compositions for x between 0 and 1 and y between 0 and 0.06 were synthesized via coprecipitation of metal hydroxides, followed by calcination. Their crystal structure was characterized via X-ray diffraction analysis, confirming that the Gd-substituted Mg-Zn ferrite samples had a single-phase spinel structure. The metal composition significantly affected the crystal structure, including the lattice parameters and crystallite size. Scanning electron microscopy (SEM) showed that the ferrite samples had a diameter of approximately 50-200 nm. Furthermore, the temperature rise in an alternating magnetic field was measured, and the magnetic induction heating properties were evaluated using the specific absorption rate (SAR) determined from the temperature profile. The SAR significantly varied depending on the compositions of x and y. When x = 0.5 and y = 0.02, the SAR was found to be at maximum. This reveals that the compositions can control the magnetic induction heating properties. The results suggest that Gd-substituted Mg-Zn ferrite nanoparticles are promising candidates for magnetic hyperthermia applications.

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“…The average crystallite size of the investigated samples estimated by Scherrer's formula [10][11][12] is found to be around 32∼41 nm. The slight decrease in the crystallite size by the addition of Zn indicates that the presence of zinc obstructs the crystal growth [13,14].…”

Section: Xrd Patterns Analysismentioning

confidence: 94%

Mössbauer Spectroscopy, Structural and Magnetic Studies of Zn²⁺ Substituted Magnesium Ferrite Nanomaterials Prepared by Sol‐Gel Method

Yang

Lin

et al. 2015

Journal of Nanomaterials

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Zinc substituted magnesium ferrite nanomaterials Mg 1− Zn Fe 2 O 4 ( = 0, 0.1, 0.3, 0.5, 0.7) powders have been prepared by a solgel autocombustion method. The lattice parameter increases with increase in Zn concentration, but average crystallite size tends to decrease by increasing the zinc content. SEM results indicate the distribution of grains and morphology of the samples. Some particles are agglomerated due to the presence of magnetic interactions among particles. Room temperature Mössbauer spectra of Mg 1− Zn Fe 2 O 4 shows that the A Mössbauer absorption area decreases and the B Mössbauer absorption area increases with zinc concentration increasing. The change of the saturation magnetization can be explained with Néel's theory. It was confirmed that the transition from ferrimagnetic to superparamagnetic behaviour depends on increase in zinc concentration by Mössbauer spectra at room temperature. Saturation magnetization increases and coercivity decreases with Zn content increasing.

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Substitutional effect of Cr3+ ions on the properties of Mg–Zn ferrite nanoparticles

Cited by 89 publications

References 31 publications

Synthesis of nanostructured pirochromite magnesium chromate with egg shell membrane template

Synthesis of nanostructured pirochromite magnesium chromate with egg shell membrane template

Synthesis and magnetic induction heating properties of Gd-substituted Mg–Zn ferrite nanoparticles

Mössbauer Spectroscopy, Structural and Magnetic Studies of Zn²⁺ Substituted Magnesium Ferrite Nanomaterials Prepared by Sol‐Gel Method

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Substitutional effect of Cr3+ ions on the properties of Mg–Zn ferrite nanoparticles

Cited by 89 publications

References 31 publications

Synthesis of nanostructured pirochromite magnesium chromate with egg shell membrane template

Synthesis of nanostructured pirochromite magnesium chromate with egg shell membrane template

Synthesis and magnetic induction heating properties of Gd-substituted Mg–Zn ferrite nanoparticles

Mössbauer Spectroscopy, Structural and Magnetic Studies of Zn2+ Substituted Magnesium Ferrite Nanomaterials Prepared by Sol‐Gel Method

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Mössbauer Spectroscopy, Structural and Magnetic Studies of Zn²⁺ Substituted Magnesium Ferrite Nanomaterials Prepared by Sol‐Gel Method