Structural and optical characterization of MgO: X (X = Li, Na, and K) by solution combustion technique

Sivasankari, J.; Selvakumar, S.; Sivaji, K.; Lee, Sejoon

doi:10.1016/j.jallcom.2014.07.052

Cited by 27 publications

(21 citation statements)

References 41 publications

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“…The slightly shifted peak position towards higher 2θ values can be ascribed to the ionic radius difference between Ni, Cr, and Mg ions. This trend is consistent with the earlier published report [26]. The broadening of XRD reflection indicates that pristine and doped MgO-NPs are of small size.…”

Section: Structural Analysissupporting

confidence: 93%

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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Section: Structural Analysissupporting

confidence: 93%

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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“…Subsequently, Figure 2 illustrates the expanded XRD patterns of the LiOH/Mg(OH) 2 samples in the (101) plane. The yellow dotted lines represent the XRD peak position of the (101) plane of Mg(OH) 2 -w. The peaks of the (101), (102), and (110) planes of the LiOH/Mg(OH) 2 samples shifted toward higher angles compared to that of Mg(OH) 2 -w. These results indicated that the lattice parameters of the samples decreased, as indicated by Bragg's law (nλ=2d sin θ), and that Li + replaced Mg 2+ in the crystal lattices (Sivasankari et al, 2014). This could be attributed to the difference between the ionic radii of Mg 2+ (72 pm) and Li + (76 pm) (Sivasankari et al, 2014).…”

Section: Resultsmentioning

confidence: 82%

“…Li-doped MgO presented semi-conductive properties. If a system of a sample had good electrical affinity, the bond length would be reduced, therefore, its lattice parameters would decrease (Sivasankari et al, 2014). Hence, the bond length of Mg(OH) 2 might also decrease as LiOH was added to it, which decreased the lattice parameter.…”

Section: Resultsmentioning

confidence: 99%

Effect of LiOH Addition on Dehydration Reaction of Mg(OH)<sub>2</sub>

Kurosawa

Ryu

2019

J. Chem. Eng. Japan / JCEJ

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The dehydration behavior of LiOH-modi ed Mg(OH) 2 (LiOH/Mg(OH) 2), as a new chemical heat storage material, was investigated. Structural analysis of LiOH/Mg(OH) 2 was carried out using an X-ray di raction (XRD) meter. The pro le of the dehydration reaction of LiOH/Mg(OH) 2 was observed to analyze the dehydration kinetics of the LiOH/Mg(OH) 2 samples. The XRD patterns of the LiOH/Mg(OH) 2 samples shifted toward higher angles than that of Mg(OH) 2. This indicated that the lattice parameter might have changed and lattice defects such as oxygen vacancies might have been generated on the surface of Mg(OH) 2. The rate of the dehydration reaction increased as the amount of added LiOH increased; therefore, LiOH/Mg(OH) 2 could be a potential chemical heat storage material. We concluded that LO20 (Mg(OH) 2 containing 20 mol% LiOH) was the combination with the most optical mixing mole ratio. This result was determined by analyzing the dehydration activation energy values. When the dehydration reactions of the LiOH/Mg(OH) 2 samples were considered to be rst-order reactions, the calculated mole fraction of Mg(OH) 2 could not be reproduced. However, the calculated mole fractions of Mg(OH) 2 were in agreement with those measured considering the reactions to be zero-and rstorder reactions. Therefore, the kinetics of the dehydration reaction of the LiOH/Mg(OH) 2 samples included both zero-and rst-order reactions.

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“…In the spectrum of untreated MgO, a sharp peak at 3700 cm −1 indicates the presence of physisorbed water, which accompanies the band of the OH bending mode at 1632 cm −1 . The bands at 526 and 648 cm −1 are due to the MgO stretching vibrations . In the spectrum of MO–MgO50, the peaks relevant to the ester group of MO were unseen.…”

Section: Resultsmentioning

confidence: 97%

Synthesis of Ultrahigh Molecular Weight Polyethylene Using MgO/MgCl₂/TiCl₄ Core–Shell Catalysts

Bando

Chammingkwan

Terano

et al. 2018

Macro Chemistry & Physics

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In this study, MgO/MgCl2/TiCl4 core–shell catalysts are employed for the production of ultrahigh molecular weight polyethylene (UHMWPE) particles, motivated by their advantages including simple preparation, ease of morphology control, and a dramatically reduced Cl content. It is found that the MgO/MgCl2/TiCl4 core–shell catalysts can provide UHMWPE at a reasonable activity, but the agglomeration of the catalyst particles leads to poor morphology of the UHMWPE. The dispersion problem is largely alleviated by modifying MgO nanoparticles with methyl oleate (MO). Thus, the MO‐modified MgO/MgCl2/TiCl4 core–shell catalyst successfully affords UHMWPE particles of 100–200 µm at a high yield of 8670 g‐PE g‐Cat−1.

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Structural and optical characterization of MgO: X (X = Li, Na, and K) by solution combustion technique

Cited by 27 publications

References 41 publications

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

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

Effect of LiOH Addition on Dehydration Reaction of Mg(OH)<sub>2</sub>

Synthesis of Ultrahigh Molecular Weight Polyethylene Using MgO/MgCl₂/TiCl₄ Core–Shell Catalysts

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Structural and optical characterization of MgO: X (X = Li, Na, and K) by solution combustion technique

Cited by 27 publications

References 41 publications

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

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

Effect of LiOH Addition on Dehydration Reaction of Mg(OH)<sub>2</sub>

Synthesis of Ultrahigh Molecular Weight Polyethylene Using MgO/MgCl2/TiCl4 Core–Shell Catalysts

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Synthesis of Ultrahigh Molecular Weight Polyethylene Using MgO/MgCl₂/TiCl₄ Core–Shell Catalysts