Electrical conductivity improvement of Fe doped ZnO nanopowders

Saadi, H.; Rhouma, F.I.H.; Benzarti, Z.; Bougrioua, Z.; Guermazi, S.; Khirouni, K.

doi:10.1016/j.materresbull.2020.110884

Cited by 93 publications

(38 citation statements)

References 85 publications

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“…This is due to the fact that any species contributing to polarization is found to lag behind the applied field, and consequently, the dipoles cannot follow the ac field [128][129][130]. On the other hand, the increase of ε′ with x can be explained in terms of increasing electro-negatively between Al and O, which is 1.83 instead of 1.79 between Zn and O, and also increasing the number of carriers as indicted above [131][132][133]. Due to this, the strength of the Al-O ionic bond is improved, which results in increasing the dielectric polarization.…”

Section: 4-dielectric Measurementsmentioning

confidence: 99%

“…Materials with high dielectric constants such as ZnO have received special attention due to the rapid developments in telecommunications and multilayer capacitors are required for microwave integrated circuits [30][31][32]. In contrast, materials that have a low dielectric constant are potential candidates for nonlinear optical and high-frequency devices, which are necessary for such applications [33]. However, some parameters have a great influence on improving ZnO dielectric constants, such as valence state, content, magnetic moment of TM, and also intrinsic defects [34][35][36][37][38].…”

Section: -Introductionmentioning

confidence: 99%

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Structural, FTIR, optical and dielectric properties of Zn1-xAlxO ceramics for advanced applications

2022

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We report here the structural, FTIR, optical and dielectric properties of Zn1-xAlxO with x = 00.00 < x < 0.20)). The wurtzite structure is conformed to all samples and the lattice constants, crystallite diameter, porosity and average crystalline size are generally decreased. The residual stress is compressive for pure samples, but it is changed to tensile for the doped samples. Interestingly, Debye temperature and elastic modulus are increased as x increases to 0.10, followed by a decrease at x = 0.20. Two different energy gaps Egh and Egl are apparent for each sample, corresponding of two transition absorption peaks. Interestingly, the ΔE = (Egh -Egl) ~ 0.60 for all samples. Further, the residual dielectric constant is decreased by increasing x to 0.10, followed by a sharp increase at x = 0.20 while the opposite behavior for (N/m * ). The dielectric constant ε′ is slightly increased as x increases to 0.025, followed by a sharp increase as x increases to 0.20, as well as the ac conductivity σ / . The conduction is electronic for x < 0.025 samples, but it is changed to hole with an increase of x to 0.20. The binding energy Wm was decreased as x increases to 0.20, but there is no exact trend against x for the behaviors of minimum hopping distance Rmin and density of localized states N. In addition, the density of states at Fermi level N (EF) has an optimum value at 195 KHz for all samples. The F-factor for solar cell design is increased as x increases to 0.10, but it is almost constant at x = 0.20. The Cole-Cole plot is a straight line for x = 0.00, a semicircle arc for x = 0.025 and a complete semicircle for x > 0.05. The impedance resistance of grain Z \ (g) and grain boundaries Z \ (gb) are gradually decreased by increasing x to 0.20. These outcomes indicate that the addition of Al to ZnO shifts the mechanical, optical, and dielectric medium to higher values, which is strongly recommended for the design of optoelectronic and solar cell instruments.

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Section: 4-dielectric Measurementsmentioning

confidence: 99%

Section: -Introductionmentioning

confidence: 99%

Structural, FTIR, optical and dielectric properties of Zn1-xAlxO ceramics for advanced applications

2022

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“…Besides the Zn and O components, the substance also contains Fe impurities from the raw material of ZnSO 4.7 H 2 O obtained from Zn fertilizer. Nevertheless, the Fe content is relatively small, while in previous studies, the range was more significant [20].…”

Section: Zno Sem Analysismentioning

confidence: 56%

“…The calculated structural parameters for various samples are shown in Table 2. The value of the lattice parameter ratio c/a increases when the sintering temperature rise from Energies 2021, 14, 5980 5 of 13 400 to 600 • C and decreases at 800 • C. Therefore, the highest value obtained is 1.651, which showed that the best hexagonal structure among all samples is ZnO 600 • C. The Zn-O (L) bond length is determined for all samples using the following equation [20,21].…”

Section: Zinc Oxide Characterizationmentioning

confidence: 99%

Synthesis and Characterization of ZnO from Thermal Decomposition of Precipitated Zinc Oxalate Dihydrate as an Anode Material of Li-Ion Batteries

et al. 2021

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Zinc oxide (ZnO) is one of the most promising materials applied in Li-ion batteries. In this research, ZnO was synthesized by the thermal decomposition of zinc oxalate dihydrate. This precursor was obtained from the precipitation process of zinc sulfate with oxalic acid. In-depth studies were carried out on the effect of various heating temperatures of zinc oxalate dihydrate precursors on ZnO synthesis. The as-prepared materials were characterized by XRD, SEM, and FTIR. Based on the XRD analysis, the presence of the ZnO-wurtzite phase can be confirmed in samples heated at temperatures above 400 °C. Meanwhile, SEM-EDX results showed that the ZnO particles have a micron size. Cells with ZnO samples as anodes have low columbic efficiency. In contrast, cells with ZnO/Graphite composite anodes have a relatively large capacity compared to pure graphite anodes. Overall, based on the consideration of the characterization results and electrochemical performance, the optimal sintering temperature to obtain ZnO is 600 °C with a cell discharge capacity of ZnO anode and in the form of graphite composites is 356 mAh/g and 450 mAh/g, respectively. This suggests that ZnO can be used as an anode material and an additive component to improve commercial graphite anodes’ electrochemical performance.

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“…Herein, the properties of ZnO become highly sensitive to the nature of the dopant element and its concentration [ 14 , 15 ]. Its electrical properties depend on the excess of zinc at the interstitial position [ 16 ] and are affected essentially by the dopant element, such as, Fe [ 17 ], Al [ 18 ], and Sn [ 19 ]. However, its dielectric features drastically change with an element incorporated into its lattice [ 20 , 21 , 22 ].…”

Section: Introductionmentioning

confidence: 99%

Transport Mechanisms and Dielectric Features of Mg-Doped ZnO Nanocrystals for Device Applications

et al. 2022

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Magnesium-doped zinc oxide “ZnO:Mg” nanocrystals (NCs) were fabricated using a sol gel method. The Mg concentration impact on the structural, morphological, electrical, and dielectric characteristics of ZnO:Mg NCs were inspected. X-ray diffraction (XRD) patterns display the hexagonal wurtzite structure without any additional phase. TEM images revealed the nanometric size of the particles with a spherical-like shape. The electrical conductivity of the ZnO NCs, thermally activated, was found to be dependent on the Mg content. The impedance spectra were represented via a corresponding circuit formed by a resistor and constant phase element (CPE). A non-Debye type relaxation was located through the analyses of the complex impedance. The conductivity diminished with the incorporation of the Mg element. The AC conductivity is reduced by raising the temperature. Its plot obeys the Arrhenius law demonstrating a single activation energy during the conduction process. The complex impedance highlighted the existence of a Debye-type dielectric dispersion. The various ZnO:Mg samples demonstrate high values of dielectric constant with small dielectric losses for both medium and high-frequency regions. Interestingly, the Mg doping with 3% content exhibits colossal dielectric constant (more than 2 × 104) over wide temperature and frequency ranges, with Debye-like relaxation. The study of the electrical modulus versus the frequency and at different temperatures confirms the non-Debye relaxation. The obtained results reveal the importance of the ZnO:Mg NCs for device applications. This encourages their application in energy storage.

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Electrical conductivity improvement of Fe doped ZnO nanopowders

Cited by 93 publications

References 85 publications

Structural, FTIR, optical and dielectric properties of Zn1-xAlxO ceramics for advanced applications

Structural, FTIR, optical and dielectric properties of Zn1-xAlxO ceramics for advanced applications

Synthesis and Characterization of ZnO from Thermal Decomposition of Precipitated Zinc Oxalate Dihydrate as an Anode Material of Li-Ion Batteries

Transport Mechanisms and Dielectric Features of Mg-Doped ZnO Nanocrystals for Device Applications

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