Comparison of anomalous magnetic properties of non-collinear CoCr2O4 and NiCr2O4 nanoparticles

Rasool, Raheela; Nadeem, K.; Kamran, Muhammad; Zeb, F.; Ahmad, N. I.; Mumtaz, M.

doi:10.1016/j.jmmm.2020.167225

Cited by 15 publications

(3 citation statements)

References 48 publications

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“…The spinel CoCr2O4 has a cubic spinel structure with multiferroicity, and a conical spin ordering has been discovered in this material. [17]. Due to the conflicting Co-Co, Cr-Cr, and Co-Cr interactions, cobalt chromate nanoparticles undergo three sequential magnetic transitions: At temperature collinear (TC) 95 K, the magnetic transition from paramagnetic to ferromagnetic (FIM) phase happens; at temperature non-collinear spiral (TS) 26 K, the magnetic transition from FIM to an incommensurate conical-spiral phase happens; and at temperature long-range collinear (TL) 14 K, the magnetic transition from ferromagnetic (FIM) to an incommensurate conical-spiral phase happens [18].…”

Section: Introductionmentioning

confidence: 99%

Facile Synthesis of Spinel CoCr2O4 and Its Nanocomposite with ZrO2: Employing in Photo‐catalytic Decolorization of Fe (II)-(luminol-Tyrosine) Complex.

2021

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In this project, the deep green power from spinel cobalt chromite (CoCr2O4) nano-crystals carried out using the coprecipitation method and then calcinated at 600 o C for 4 hours. This produced nano-crystal (spinel CoCr2O4) fabricated using the ultrasonic technique to link it with zirconium dioxide (ZrO2) in ratios 1:2 and 1:3, respectively. The X-ray diffraction (XRD), scan electron microscopy (SEM), and energy-dispersive X-rays (EDX), as well as ultraviolet-visible spectrophotometry used to describe the characterizations of prepared materials. The XRD analysis demonstrated that the spinel CoCr2O4 synthesis and their composites were found to be nanoparticles. XRD spectra indicated that the spinel CoCr2O4 is successfully loaded on ZrO2, because, the 2θ of ZrO2 is shifted toward a high 2θ value after spinel CoCr2O4 loaded. This case is attituded to the tiny Co 2+ and Cr 3+ ions combined with Zr 4+ in crystal lattice. The SEM images and EDX spectra of these obtained nanomaterials were found to be spherical agglomerations with an enhanced degree of surface roughness after surface fabrication. On the other side, the bandgap of spinel CoCr2O4 nanocrystals elevated from 3.2 to 4.8 eV with increasing the ZrO2 dose. Under UV-A light, the photocatalytic decolorization efficiency of Fe (II)-(luminol-Tyrosine) complex utilizing spinel CoCr2O4 nanocrystals was tested, and it increases from 17.57 % to 30.67% and 41.97% when its nanocomposite was used in 1:2 and 1:3 ratios, respectively. The elevated efficiency after modified the spinel CoCr2O4 surface with ZrO2 as nanocomposite, due to increasing the acidity of the spinel CoCr2O4 surface that enhances the adsorption of hydroxyl on its surface then generality of the hydroxyl radical, and reducing the recombination. The photoreaction using spinel CoCr2O4 nanocrystals, ZrO2, and their composites were followed pseudo-first-order kinetics depended on the complex concentration.

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Section: Introductionmentioning

confidence: 99%

Facile Synthesis of Spinel CoCr2O4 and Its Nanocomposite with ZrO2: Employing in Photo‐catalytic Decolorization of Fe (II)-(luminol-Tyrosine) Complex.

2021

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“…Similarly, the peaks that occurred at 1714, and 1651 cm -1 is correlated to vibration modes in interlayer of water molecules. Also, there are vibration modes between 40-700 cm −1 which are attributed to the M-O (Nickel-oxygen) and M-OH (Nickel-hydroxide) bonds [2,50,51]. The peaks at 486 and 527 cm -1 proved the presence of Cr-O bonds at octahedral, and the peaks at 660 cm -1 showed the occurrence of the Ni-O bonds at tetrahedral positions.…”

Section: Xrd and Ftir Resultsmentioning

confidence: 97%

“…According, considerable research activities are performed to discover new and elevated functionality of these materials by tailoring the chemical composition and microstructure [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Structural characterization, lattice features, and optical, and magnetic properties of Ni-Cr oxide nanocomposite

Javadi

Mohammadzadeh

Aghaeinejad‐Meybodi

2023

Preprint

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In the present study, the nanocomposite of Ni-Cr oxide was synthesized through the chemical co-precipitation route with different ratios of NiO to Cr2O3, including 50–50, 60 − 40, and 70 − 30 wt. %. The morphological and physical properties of products were assessed thoroughly. Moreover, the possible chemical reactions through synthesis were proposed based on FTIR and XRD results. The crystallite size, the lattice strain, and stress were evaluated through some well-known methods based on XRD diffraction. The particle size and morphology of produced powders were studied by FESEM imaging. Also, the optical and magnetic features were assessed by UV-Vis spectroscopy and VSM analysis, respectively. The results proved the presence of NiO and NiCr2O4 in the calcined products, with uniform distribution of elements and an average particle size of < 30 nm. Moreover, the crystallite size, and the lattice stress and strain decreased with increasing NiO in the product. According to the VSM curves, nanocomposite powders showed a weak ferro/ferrimagnetic signal with a fairly dominant superparamagnetic feature. While the largest coercivity of 252 Oe belonged to the sample 70 − 30, the highest magnetization saturation (0.291 emu/g) was observed for 50–50. According to the UV-Vis curves, the value of band gap energy was in the semiconductor’s domain and increased by NiO value in the hybrid oxide combination.

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Effect of NiO–NiCr2O4 nano-oxides on the microstructural, mechanical and corrosion properties of Ni-coated carbon steel

Mojallal

Mohammadzadeh²,

Aghaeinejad‐Meybodi³

et al. 2023

Int J Miner Metall Mater

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Comparison of anomalous magnetic properties of non-collinear CoCr2O4 and NiCr2O4 nanoparticles

Cited by 15 publications

References 48 publications

Facile Synthesis of Spinel CoCr2O4 and Its Nanocomposite with ZrO2: Employing in Photo‐catalytic Decolorization of Fe (II)-(luminol-Tyrosine) Complex.

Facile Synthesis of Spinel CoCr2O4 and Its Nanocomposite with ZrO2: Employing in Photo‐catalytic Decolorization of Fe (II)-(luminol-Tyrosine) Complex.

Structural characterization, lattice features, and optical, and magnetic properties of Ni-Cr oxide nanocomposite

Effect of NiO–NiCr2O4 nano-oxides on the microstructural, mechanical and corrosion properties of Ni-coated carbon steel

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