Enhanced dielectric properties of ternary ZnO-based composites for dielectric applications

Essalah, G.; Guermazi, H.; Guermazi, S.; Leroy, G.; Duponchel, B.; Poupin, Christophe; Rao, Ashok; Mangavati, Suraj

doi:10.1007/s00339-021-05123-2

Cited by 8 publications

(2 citation statements)

References 41 publications

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“…The particle size and lattice strain of pure ZnO and Cu/Co co-doped ZnO nanoparticle samples were determined using the Williamson–Hall technique from the broadening of the XRD peaks. 31 where β is the FWHM in radian by fitting the prominent peaks, θ is the diffraction angle in radian, k is the shape factor value 0.94, ‘‘λ’’ is the XRD wavelength (λ = 0.15418 nm), and ‘‘ D ’’ is the effective crystalline size. Figure 3 a–d shows the pure ZnO and Cu/Co co-doped ZnO nanoparticle samples; the slope of linear data plotted fits against 4sin θ versus β cos θ and contributes the information about the inverse of the intercept, and lattice strain yields the value of crystalline size ( D W–H ).…”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Room-Temperature Ferromagnetism in Cu/Co Co-Doped ZnO Nanoparticles Prepared by the Co-Precipitation Method: For Spintronics Applications

et al. 2022

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In current work, pure ZnO and Zn 0.96– x Cu 0.04 Co x O (0 ≤ x ≤ 0.05) nanoparticles were synthesized by the co-precipitation method. Structural analysis and phase determination of the formed nanoparticles was carried out using X-ray diffraction (XRD) and Williamson–Hall plots. The hexagonal wurtzite structure was manifested by all the samples with divergent microstructures. The change in lattice parameters, bond length, dislocation density, and lattice strain indicates that Cu and Co were successfully incorporated. Average crystallite size was found to be in the range of 32.16–45.42 nm for various doping concentrations. Field emission scanning electron microscopy results exhibited that the surface morphology is an amalgam of spherical-like and hexagon-like structures. Spherical-shaped grains were homogeneous and evenly distributed all over the structure. Fourier transform infrared spectra indicated that the absorption bands were blue-shifted with increasing Co concentration. The UV–visible absorption spectra showed high absorption in the UV region and weak absorption in the visible region. An increase in the energy band gap for the maximum absorption peak was observed from 3.49 eV for ZnO to 3.88 eV for Zn 0.91 Cu 0.04 Co 0.05 O. The Burstein–Moss effect explained the noticed blue shift in absorption spectra and energy band gaps. The vibrating sample magnetometer study revealed the change in the diamagnetic behavior of pure ZnO to the ferromagnetic behavior of the prepared nanoparticles at room temperature for different doping concentrations. In the current study, we have developed the room-temperature ferromagnetism (RTFM) for Cu and Co co-doped ZnO nanoparticles. Since RTFM is the key objective for dilute magnetic semiconductors, therefore it can be served as the desirable expectant for spintronics applications with improved functionalities and device concepts.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Room-Temperature Ferromagnetism in Cu/Co Co-Doped ZnO Nanoparticles Prepared by the Co-Precipitation Method: For Spintronics Applications

et al. 2022

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A Novel Synthesis of ZnNb₂O₆ Nanoparticles via Combustion Method: Supercapacitor and Photocatalytic Properties

Basavaraju,

Raghavendra,

Hamdalla

et al. 2024

Part & Part Syst Charact

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In light of the current study's demonstration of the synthesis of Zn doped niobium metal oxide a low‐cost approach is provided for the synthesis of ZnNb2O6 nanoparticles. Using the urea and oxalyl dihydrazide (ODH) as fuel and complexing agent, ZnNb2O6 NPs are synthesized via the solution combustion process. The X‐ray diffraction (XRD) patterns reveal that ZnNb2O6 has a columbite‐orthorhombic structure. The field emisssion‐scanning electron microscopy (FE‐SEM) micrographs revealed the presence of uniform and spherically shaped morphology for ZnNb2O6. The role of ZnNb2O6 in the photocatalytic degradation of fuchsin acid dye is investigated under UV‐rays. The remarkable photocatalytic degradation activity of the material is demonstrated with 90% degradation rate. The fabricated electrode is used for the electrochemical analysis of the resultant material. The capacitance of 223 and 198 Fg−1 at a scan rate of 5 Ag−1, respectively, are measured in a 3‐electrode using the chemically generated ZnNb2O6, as per the Galvanostatic charge discharge (GCD) experiment. Furthermore, it exhibited excellent cycling stability, maintaining over 85% of its initial capacitance even after 2000 cycles. The goal of this research is to develop a solution combustion method for synthesizing ZnNb2O6 NPs from urea and ODH so that it may be more effectively tested for electrochemical, sensing, and photocatalytic uses.

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Structural and mechanical evaluation of a new Ti-Nb-Mo alloy produced by high-energy ball milling with variable milling time for biomedical applications

Dahmani,

Fellah,

Hezil

et al. 2023

Int J Adv Manuf Technol

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The main focus of this work is to investigate the impact of varying milling times (2 to 18 h) on the structural and mechanical properties of the developed Ti-Nb-Mo alloy. The morphology, phase composition, microstructure, and mechanical behavior of milled and sintered Ti-25Nb-25Mo alloy samples were characterized systematically using x-ray diffraction, scanning electron microscope, optical microscope, and Vicker microhardness. It was noted that the quantity of the β-Ti phase increased as the milling time increased. After 12 h of milling, the synthesized alloys exhibited a spherical morphology and texture with homogeneous distribution. The milled alloys' structural evolution and morphological changes were found to be dependent on their milling duration. Morphological analysis revealed that the crystallite size and mean pore size decreased when the milling duration increased, reaching minimum values of 51 nm and < 1 μm, after 12 and 18 h respectively. As the milling time increased, the grain size decreased, resulting in an increase in density, microhardness, and elastic modulus. Ti-25Nb-25Mo will presents good anti-wear ability and higher resistance to plastic deformation due to enhanced mechanical characteristics (H/E, and H3/E2). Hence, the developed Ti-25Nb-25Mo alloys with reduced elastic modulus and desirable mechanical properties were found to be a promising option for biomedical applications.

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Enhanced dielectric properties of ternary ZnO-based composites for dielectric applications

Cited by 8 publications

References 41 publications

Room-Temperature Ferromagnetism in Cu/Co Co-Doped ZnO Nanoparticles Prepared by the Co-Precipitation Method: For Spintronics Applications

Room-Temperature Ferromagnetism in Cu/Co Co-Doped ZnO Nanoparticles Prepared by the Co-Precipitation Method: For Spintronics Applications

A Novel Synthesis of ZnNb₂O₆ Nanoparticles via Combustion Method: Supercapacitor and Photocatalytic Properties

Structural and mechanical evaluation of a new Ti-Nb-Mo alloy produced by high-energy ball milling with variable milling time for biomedical applications

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Enhanced dielectric properties of ternary ZnO-based composites for dielectric applications

Cited by 8 publications

References 41 publications

Room-Temperature Ferromagnetism in Cu/Co Co-Doped ZnO Nanoparticles Prepared by the Co-Precipitation Method: For Spintronics Applications

Room-Temperature Ferromagnetism in Cu/Co Co-Doped ZnO Nanoparticles Prepared by the Co-Precipitation Method: For Spintronics Applications

A Novel Synthesis of ZnNb2O6 Nanoparticles via Combustion Method: Supercapacitor and Photocatalytic Properties

Structural and mechanical evaluation of a new Ti-Nb-Mo alloy produced by high-energy ball milling with variable milling time for biomedical applications

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A Novel Synthesis of ZnNb₂O₆ Nanoparticles via Combustion Method: Supercapacitor and Photocatalytic Properties