Crystallographic and Magnetic Properties of Al3+co-doped NiZnFe2O4 Nano- particles Prepared by Sol-gel Process

Z n 1-x TiO 3 :xCu (x=0%, 1%, 5%) thin films were prepared on glass and quartz substrates via the sol-gel method (wet-chemistry) and spin coating process. Structural and optical properties of the prepared films have been characterized by X-ray diffraction, field emission scanning electron microscope and UV-visible spectrophotometer. The doping of the thin films by different concentration of Cu ions exhibited change in structure from cubic to hexagonal system. The average crystalline size was calculated from X-ray line broadening and it is decreased from 21.88 nm (ZnTiO 3) to 11.21 nm (Zn 0.95 Cu 0.05 TiO 3). The fundamental optical constants of the thin films (refractive index, absorption coefficient, extinction coefficient, dielectric constant, band gap) were determined using the UV-Vis reflectance and transmittance spectroscopy. The analysis of the optical absorption data revealed that undoped film has indirect transition (E g = 3.22 eV) and the Cu-doped films have direct allowed transition with band gap energy increased to 3.96 eV.

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“…The average crystallite size was determined from the XRD powder pattern according to the Scherrer's equation [17]:…”

Section: Resultsmentioning

confidence: 99%

Structural and optical properties of wet-chemistry Cu co-doped ZnTiO3 thin films deposited by spin coating method

2018

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“…The coercivity (Hc), saturation magnetization (Ms) and remanent magnetization (Mr) for all samples are listed in Table 6. The observed changes in the values of Ms, Hc and Mr with increasing of Al concentrations can be explained according to the expected changes in exchange interaction between the ions at tetrahedral (A) and octahedral (B) sites in ferrites upon the variation in chemical composition [42]. The saturation magnetization decreases with the increase in Al content (x), which is quite reasonable due to the substitution of magnetic Fe 3+ ions (5μB) by nonmagnetic Al 3+ ions (0 μB).…”

Section: Elastic Propertiesmentioning

confidence: 91%

Preparation and Magnetic Properties of Cu Ni Al Ferrite Nanoparticles and Polypyrrole/Cu0.5Ni0.5Al0.3Fe1.7O4 Composite

2020

Egyptian Journal of Solids

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Nanostructure copper nickel aluminum ferrite samples (Cu0.5Ni0.5AlxFe2-xO4, x=0, 0.1, 0.2, 0.3 and 0.4) have been synthesized by using the citrate precursor technique. Then, a PPy/Cu0.5Ni0.5Al0.3Fe1.7O4 composite sample has been prepared by polymerization of polypyrrole (PPy) monomer in the presence of Cu0.5Ni0.5Al0.3Fe1.7O4 nanoparticles. The characterizing techniques used in the present investigation are X-ray diffraction analysis (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectrometry (FTIR) and vibrating sample magnetometer (VSM) measurements. The results have revealed the pure formation of the desired ferrite nanoparticles. The formation of PPy has been evidenced by FTIR. The lattice constant and the theoretical density Dx have been found to decrease by increasing the aluminum content, whereas the Debye temperature and the elastic moduli have increased. The SEM image of the composite has obviously clarified that the ferrite particles are dispersed nearly homogeneously in the polymer matrix. The hysteresis loops of all samples have proved that they can be classified as soft magnetic materials. Moreover, the saturation magnetization Ms of the ferrite series has been found to decrease with the increase in Al content and also has further decreased in the composite as expected. The coercivity Hc has low values in general. Moreover, its value of the composite is higher compared to that of the pure Cu Ni ferrite because the PPy increases the surface anisotropy, whereas it is almost equal to the coercivity of the Al containing ferrites, indicating some similarity of introducing Al and PPy to the material from the perspective of interruption of the ferrimagnetic order. The low coercivity of the samples are required in important devices which depend on soft magnetic materials such as switching devices and high frequency transformers.

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“…Infrared spectroscopy is studied to portray the synthesis of the Zn/Fe nanoparticles through sol-gel processes (hydrolysis and condensation) together with the expansion of the Polystyrene-polyethylene organic network during the synthesis and aging processes [4,23,24]. Evidence of the chemical structure of the PPFe and Zn doped nanocomposites, FTIR was used to allocate the altered characteristic absorption groups.…”

Section: Infra-red Spectroscopymentioning

confidence: 99%

Sol-Gel/Gel Casting Nanoarchitectonics of Hybrid Fe2O3–ZnO/PS-PEG Nanocomposites and Their Optomagnetic Properties

Mansour

Elhelali

Nahrawy

2022

J Inorg Organomet Polym

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Polymer networks incorporated with iron and zinc oxide nanoparticles have superparamagnetic and electrical characteristics where it can be employed in a variety of significant applications. To achieve optimal distribution and connection of nanoparticles in various polymeric matrices, it is required to investigate their dispersion performance with varied contents and the impact on their physical characteristics. A controlled sol-gel method is used combined with gel casting to synthesize organic-inorganic nanocomposites of (ZnO)x(1 − x)Fe2O3 loaded within a polystyrene-polyethylene glycol matrix. The structural and morphological assembly of the hydrogen bonds between the inorganic and organic parts is verified using X-ray diffraction (XRD) and scanning/transmission electron microscope (SEM/TEM) for the synthesized nanocomposites. The existence of the Fe aggregates, Zn/Fe pairs, and organic molecules was also confirmed by FTIR spectra. Optical and magnetic properties were evaluated. The band gap, refractive index, optical dielectric constant, and optical electronegativity were extracted.

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Crystallographic and Magnetic Properties of Al3+co-doped NiZnFe2O4 Nano- particles Prepared by Sol-gel Process

Cited by 12 publications

References 16 publications

Structural and optical properties of wet-chemistry Cu co-doped ZnTiO3 thin films deposited by spin coating method

Structural and optical properties of wet-chemistry Cu co-doped ZnTiO3 thin films deposited by spin coating method

Preparation and Magnetic Properties of Cu Ni Al Ferrite Nanoparticles and Polypyrrole/Cu0.5Ni0.5Al0.3Fe1.7O4 Composite

Sol-Gel/Gel Casting Nanoarchitectonics of Hybrid Fe2O3–ZnO/PS-PEG Nanocomposites and Their Optomagnetic Properties

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