Structures and properties of Mg0.95Mn0.01TM0.04O (TM = Co, Ni, and Cu) nanoparticles synthesized by sol–gel auto combustion technique

Dar, M. A.; Varshney, Dinesh

doi:10.1039/c8ra00816g

Cited by 11 publications

(4 citation statements)

References 42 publications

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“…The Rietveld refined XRD patterns of pure NiO and the sintered samples with various K concentrations are shown in Figure 2. all index parameters can be used as numerical criteria of the quality of fit when calculating the experimental diffraction data, in agreement with other reports 7,39 . The refined lattice parameter values change slightly in comparison with the pure NiO (4.1768 Å) and increase with the K content from 4.1787 to 4.1839 Å, which could possibly result from the larger ionic radius of K + (1.38 Å) than that of Ni 2+ (0.69 Å) 40 .…”

Section: Resultssupporting

confidence: 86%

Structures and Properties of KxCryNi1-x-yO Dielectric Materials Prepared by an Ultrasonic-Assisted Sol-Gel Method

et al. 2021

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K x Cr y Ni 1-x-y O (x = 0.05-0.20, y = 0.02) dielectric materials were prepared using a facile simple green ultrasonic-assisted sol-gel method. All samples have a main phase consisting of a cubic NiO structure and with nanoscale crystallite sizes (28.58-37.51 nm). However, secondary phases were also observed for the samples with x values exceeding 0.10. The fractured surface microstructures of the samples with x values less than 0.15 exhibited uniformly distributed spherical grains. Other samples showed irregularly shaped grains. The grain sizes were larger when x was increased to 0.15 and exhibited increased grain growth probably due to substitution of K ions into the NiO lattice. However, a reduction of grain sizes was observed in the sample with x = 0.20, possibly due to inhibition of the grain growth by the secondary phase. At room temperature and a frequency of 1013 Hz, the highest dielectric constant of 2.25 × 10 4 was obtained for the samples with x = 0.15.

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Section: Resultssupporting

confidence: 86%

Structures and Properties of KxCryNi1-x-yO Dielectric Materials Prepared by an Ultrasonic-Assisted Sol-Gel Method

et al. 2021

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“…One can perceive a slight shift of the position in the diffraction peaks representing a slight variation in lattice parameters. The values of the refined lattice parameters are in good agreement with previous experimental results [32]. The slight variation of lattice parameters with doping may indicate the existence of point defects.…”

Section: Structural Analysissupporting

confidence: 89%

“…EDS is a surface-sensitive technique and it typically offers elemental composition existent up to few layers from the surface. In stoichiometric MgO, the Mg/O atomic percentage composition is 50/50 [32]. The EDS spectrum from the MgO synthesized by the aqueous method shows carbon impurities in addition to the expected magnesium and excess oxygen (Figure 8(a)).…”

Section: Structural Analysismentioning

confidence: 99%

The Effect of Transition Metals Incorporation on the Structural and Magnetic Properties of Magnesium Oxide Nanoparticles

Hanish

Edrees

Shukur

2020

IJE

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Pure and doped magnesium oxide nanoparticles were successfully synthesized employing a sol-gel process. The synthesized nanoparticles were characterized by thermal differential analysis, X-ray powder diffraction, transmission electron microscopy, scanning electron microscope, energy-dispersive X-ray spectroscopy, and vibrating sample magnetometer. X-ray diffraction patterns confirmed the crystallization of MgO structure and correspondingly ratified that the transition metal atoms were incorporated into the MgO host lattice. The crystallite size decreases as the concentration of dopants were augmented. TEM images showed that the particles of pristine magnesium oxide were embedded in the sheet matrix of the graphene-like layer with a size of 22.06 nm. The EDS spectra revealed the presence of carbon in pure MgO nanoparticles, while nickel and chromium were distributed in the host lattice. Based on VSM measurements, room temperature ferromagnetism in pristine MgO-NPs could be ascribed to the presence of either Mg vacancy or carbon atoms. Furthermore, paramagnetic ordering had been observed upon doping. Overall, the prepared MgO-NPs may be found as a potential application in spintronics devices.

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“…These defects are located on the different coordination sites on the surface and undergo excitation when exposed to UV photon energy [13]. The relation between the 'α' (absorption coefficient) and the 'hν' (photon energy) can be specified by using Tauc's relation [16,17]:…”

Section: Optical Propertiesmentioning

confidence: 99%

Precipitator concentration-dependent opto-structural properties of MgO nanoparticles fabricated using natural brine

Yousefi

Ghasemi

2020

SN Appl. Sci.

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In this paper, MgO nanoparticles (MNPs) were synthesized using simple wet chemical precipitation technique from evaporative brine as Mg ions precursor. The effect of NaOH concentration on morpho-structural and optical properties of as-synthesized nanoparticles was studied. The obtained nanoparticles were characterized by X-ray Diffraction (XRD), transmission electron microscopy (TEM), field emission scanning electron microscope (FESEM), energy dispersive X-ray (EDS), fourier transform infrared spectroscopy and UV-Vis absorption spectroscopy. The obtained structural properties (from XRD analysis) indicated that MNPs had pure cubic phase, high crystallinity, and average crystallite size and were in good agreement with TEM and FESEM characteristics. Also, increasing the concentration of the precipitator resulted in reduced crystallites size (from 37.09 to 17.61 nm), nanoparticles size (from 35-88 nm to 22-75 nm), and strain value (from 1.23 × 10-3 to 0.57 × 10-3). The optical properties of MNPs including absorption (A), transmittance (T), absorption coefficient (α), optical band gap energy (E g), Extinction coefficient (k), and refractive index (n) were investigated using UV-Vis spectroscopy and examined in details.

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Structures and properties of Mg_0.95Mn_0.01TM_0.04O (TM = Co, Ni, and Cu) nanoparticles synthesized by sol–gel auto combustion technique

Abstract: The room temperature structural, optical and dielectric properties of Mg0.95Mn0.05O and Mg0.95Mn0.01TM0.04O (TM = Co, Ni, and Cu) nanoparticles are reported.

Cited by 11 publications

References 42 publications

Structures and Properties of KxCryNi1-x-yO Dielectric Materials Prepared by an Ultrasonic-Assisted Sol-Gel Method

Structures and Properties of KxCryNi1-x-yO Dielectric Materials Prepared by an Ultrasonic-Assisted Sol-Gel Method

The Effect of Transition Metals Incorporation on the Structural and Magnetic Properties of Magnesium Oxide Nanoparticles

Precipitator concentration-dependent opto-structural properties of MgO nanoparticles fabricated using natural brine

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