Magnetic and Mössbauer Spectroscopy Studies of Zinc-Substituted Cobalt Ferrites Prepared by the Sol-Gel Method

Lin, Qing; Xu, Jia‐Zhuang; Yang, Fang; Lin, Jinpei; Hu, Yang; He, Yun

doi:10.3390/ma11101799

Cited by 42 publications

(24 citation statements)

References 38 publications

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“…However, in the magnetic measurements, the applied field aligns the magnetic moments, resulting in a ferromagnetic-like behavior. Similar ferromagnetic behavior in the magnetization measurements and paramagnetic behavior in Mössbauer spectroscopy was recently reported for ferrites [40,44].…”

Section: Magnetizationsupporting

confidence: 87%

Synthesis and Characterization of Novel Phyto-Mediated Catalyst, and Its Application for a Selective Oxidation of (VAL) into Vanillin under Visible Light

et al. 2020

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Here, we report an efficient and highly selective oxidation of lignin model substrate using phyto-mediated ZnFe2O4 nanoparticle using Boswellia carterii extract. The nanocatalyst with an average size of 8 nm showed excellent photocatalytic activity of the synthesized carbonyl containing products under visible light irradiation. The catalytic activity and selectivity towards oxidation of vanillyl alcohol to vanillin with selectivity up to 99% at conversion over 98% and turn-over frequency values up to 1600 h−1 were obtained in the presence of H2O2 and base. The cubic spinel nano-ZnFe2O4 catalyst was characterized by powder-XRD, FESEM, HR-TEM and Mössbauer analysis. The demonstrated catalyst was robust and stable under the reaction conditions. Furthermore, it was easy to be separated from the reaction mixture and be reused for subsequent reactions up to 5 times without significant reactivity or selectivity loss.

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Section: Magnetizationsupporting

confidence: 87%

Synthesis and Characterization of Novel Phyto-Mediated Catalyst, and Its Application for a Selective Oxidation of (VAL) into Vanillin under Visible Light

et al. 2020

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“…The density of X rays is determined by the following formula [13,14,15]: ρx=8MNa3 where a is the lattice parameter, M is relative molecular mass, and N is the Avogadro number.…”

Section: Resultsmentioning

confidence: 99%

“…This shows that the prepared ferrite powders were nanoparticles and that the average grain size decreased significantly by increasing the Cr content, which can be due to the ionic radius of iron atoms being larger than the ionic radius of chromium atoms. The average crystallite size was determined by XRD to be slightly smaller than the average grain size [15].…”

Section: Resultsmentioning

confidence: 99%

Structural and Magnetic Property of Cr3+ Substituted Cobalt Ferrite Nanomaterials Prepared by the Sol-Gel Method

et al. 2018

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Cobalt-chromium ferrite, CoCrxFe2−xO4 (x = 0–1.2), has been synthesized by the sol-gel auto-combustion method. X-ray diffraction (XRD) indicates that samples calcined at 800 °C for 3 h were a single-cubic phase. The lattice parameter decreased with increasing Cr concentration. Scanning electron microscopy (SEM) confirmed that the sample powders were nanoparticles. It was confirmed from the room temperature Mössbauer spectra that transition from the ferrimagnetic state to the superparamagnetic state occurred with the doping of chromium. Both the saturation magnetization and the coercivity decreased with the chromium doping. With a higher annealing temperature, the saturation magnetization increased and the coercivity increased initially and then decreased for CoCr0.2Fe1.8O4.

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“…Therefore, the graph of extrapolate functions for the synthesized powders was drawn ( Figure 6). Theoretical density (X-ray density) and specific surface area of the powders were also calculated using the following equations [10,24]:…”

Section: Xrd Analysismentioning

confidence: 99%

“…Due to this and achieving various properties such as magnetic permeability, coercive force, anisotropy constant, saturation magnetization (Ms), mechanical stiffness, physical and chemical stability, the range of use of these materials is varied. Accordingly, much research has been done on the doping effect of different 2/3 valent elements inside the ferrite structures on the synthesis and magnetic properties [5][6][7][8][9][10][11][12][13][14][15]. Among them, cobalt ferrite is interested due to properties such as high magnetic permeability, high coercive force (HC) (≥50 KOe), good saturation magnetization (MS) (80 emu/gr), mechanical hardness and excellent physical and chemical stability.…”

Section: Introductionmentioning

confidence: 99%

Effect of pH Value on Synthesis and Properties of Zinc Cobalt Ferrite Nano Powders Prepared via Co-Precipitation Method

Shahbahrami¹,

Rabiee²,

Shidpoor³

2020

Preprint

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The effect of pH value on the synthesis of zinc cobalt ferrite nano powder via co-precipitation method was investigated. Zinc cobalt ferrite (Co0.6Zn0.4Fe2O4) precipitated using a solution of nitrate raw materials under different pHs (pH=8, 10, 11, 12 and 14) and calcined at 750 °C for 2 hours. The obtained nano-powders were characterized by X-ray diffraction (XRD), Williamson-Hall relations and Extrapolate functions, field emission scanning electron microscopy (FESEM) and vibrating sample magnetometer (VSM) measurements. The amount of pH had a significant effect on the structural and magnetic properties of the synthesized powders. At pHs 8 and 10, a tensile strain and above that a compressive strain was created in the system. By changing the tensile strain to compression the crystallite diameter increased, so that the crystallite diameter increased from 19.3 nm at pH 8 to 47.8 nm for pH =11. The HC of the all samples was in the range of 140-150 Oe. The saturation magnetization, anisotropy and Bohr magneton constants were 100.38 emu/gr, 15357.70 erg/Oe and 4.27, respectively for the synthesized sample at pH=11, which were higher than the other samples. These changes are due to the effect that pH has on the parameters of the crystallite diameter, particle size and also on the cation distribution of the ions in tetrahedral/octahedral spaces.

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Magnetic and Mössbauer Spectroscopy Studies of Zinc-Substituted Cobalt Ferrites Prepared by the Sol-Gel Method

Cited by 42 publications

References 38 publications

Synthesis and Characterization of Novel Phyto-Mediated Catalyst, and Its Application for a Selective Oxidation of (VAL) into Vanillin under Visible Light

Synthesis and Characterization of Novel Phyto-Mediated Catalyst, and Its Application for a Selective Oxidation of (VAL) into Vanillin under Visible Light

Structural and Magnetic Property of Cr3+ Substituted Cobalt Ferrite Nanomaterials Prepared by the Sol-Gel Method

Effect of pH Value on Synthesis and Properties of Zinc Cobalt Ferrite Nano Powders Prepared via Co-Precipitation Method

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