Effects of different compositions from magnetic and nonmagnetic dopants on structural and electrical properties of ZnO nanoparticles-based varistor ceramics

Sendi, Rabab Khalid

doi:10.1016/j.solidstatesciences.2018.01.005

Cited by 14 publications

(6 citation statements)

References 24 publications

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“…For the dielectric loss, it is principally estimated by means of the grain boundary resistance. Furthermore, this parameter is dependent on the electric conductance property in the lowfrequency range (Sendi, 2018). Therefore, the lower To compare our results with those available in the literature, several works reported by many researchers on the properties of different varistor structures have been discussed (Table 4).…”

Section: E-j Characterization Of the Prepared Zno Varistorsmentioning

confidence: 73%

“…The high temperatures present a large driving force for the internal atomic diffusion responsible for grain growth and pore elimination. They also facilitate the development of a well-oriented crystal lattice (Sendi, 2018) (A.Bouchekhlal, F.Hobar and Boulesbaa, 2018).…”

Section: Resultsmentioning

confidence: 99%

“…For the dielectric loss, it is principally estimated by means of the grain boundary resistance. Furthermore, this parameter is dependent on the electric conductance property in the low-frequency range (Sendi, 2018). Therefore, the lower dissipation factor value at 1300°C of the sintering temperature suggests that the grain boundaries, created within the varistor-based ZnO sintered at this temperature, are better related to those which are formed at different sintering temperatures.…”

Section: Resultsmentioning

confidence: 99%

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Synthesis and characterization of ZnO based varistor ceramics: effect of sintering temperatures

Bouchekhlal¹,

Boulesbaa

2022

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Purpose The purpose of this paper is to investigate the effects of the sintering temperature on the microstructural, morphological and electrical characteristics of Zinc oxide (ZnO)-based varistors. Design/methodology/approach This study used a conventional method to design and produce ZnO varistors by sintering ZnO powder with small amounts of various metal oxides. Furthermore, the effect of sintering temperature on varistor properties of (Bi, Co, Cr, Sb, Mn)-doped ZnO ceramics was investigated in the range of 1280–1350 °C. Findings The obtained results showed an EB value of 2109.79 V/cm, a Vgb value of 0.831 V and a nonlinear coefficient (α) value of 19.91 for sample sintered at temperature of 1300 °C. In addition, the low value of tan δ at low frequency range confirmed that the grain boundaries created in 1300 °C sintering temperature were obviously good. Originality/value Based on the previous research on the ZnO-based varistors, a thorough study was carried out on these components to improve their electrical characteristics. Thus, it is necessary that those varistors have low leakage current and low value of dissipation factor to ensure their good quality. High breakdown fields and nonlinearity coefficients are also required in such kind of components. The effect of sintering temperature on the varistor properties of the new compositions (zinc, bismuth, manganese, chrome, cobalt, antimony and silicon oxides)-doped ZnO ceramics was studied in the range of 1280–1350 °C. Also, the microstructure and the phase evolution of the samples sintered at various temperatures (1280 °C, 1300 °C, 1320 °C and 1350 °C) were investigated according to X-ray diffraction and scanning electron microscope measurements.

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Section: E-j Characterization Of the Prepared Zno Varistorsmentioning

confidence: 73%

Section: Resultsmentioning

confidence: 99%

“…For the dielectric loss, it is principally estimated by means of the grain boundary resistance. Furthermore, this parameter is dependent on the electric conductance property in the low-frequency range (Sendi, 2018). Therefore, the lower dissipation factor value at 1300°C of the sintering temperature suggests that the grain boundaries, created within the varistor-based ZnO sintered at this temperature, are better related to those which are formed at different sintering temperatures.…”

Section: Resultsmentioning

confidence: 99%

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Synthesis and characterization of ZnO based varistor ceramics: effect of sintering temperatures

Bouchekhlal¹,

Boulesbaa

2022

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“…The decrease in the average grain size with further increase in the Pr-doping amount can be clarified by the increase in the numbers of grain boundaries between the electrodes, thereby increasing the breakdown voltage and enhanced the nonlinearity of the varistor ceramics. A high nonlinear coefficient leads to the increased breakdown field of the ceramic samples [ 37 ]. The increase in the breakdown voltage with further increase in the Pr-doping content also reduced the leakage current, indicating that it occurs at lower current density due to the increase in barrier height at the grain boundaries.…”

Section: Resultsmentioning

confidence: 99%

Synergistic Effects of Pr6O11 and Co3O4 on Electrical and Microstructure Features of ZnO-BaTiO3 Varistor Ceramics

et al. 2021

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This paper investigated the effects of Pr6O11 and Co3O4 on the electrical properties of ZnO-BaTiO3 varistor ceramics. The Pr6O11 doping has a notable influence on the characteristics of the nonlinear coefficient, varistor voltage, and leakage current where the values varied from 2.29 to 2.69, 12.36 to 68.36 V/mm and 599.33 to 548.16 µA/cm2, respectively. The nonlinear varistor coefficient of 5.50 to 7.15 and the varistor voltage of 7.38 to 8.10 V/mm was also influenced by the use of Co3O4 as a dopant. When the amount of Co3O4 was above 0.5 wt.%, the leakage current increased from 202.41 to 302.71 μA/cm2. The varistor ceramics with 1.5 wt.% Pr6O11 shows good nonlinear electrical performance at higher breakdown voltage and reduced the leakage current of the ceramic materials. Besides, the varistor sample that was doped with 0.5 wt.% Co3O4 was able to enhance the nonlinear electrical properties at low breakdown voltage with a smaller value of leakage current.

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“…is oxide has a large number of applications, with a vulcanization activator in the rubber industry being the main function. ZnO is a highly important raw material in ceramics (glazes and enamels in tiles and sanitary ware), in electroceramics such as overvoltage protection devices (varistors) (Sendi [23] and Xu [24]), and in optoelectronics (Kahouli et al [25], Hussein et al [26], and Torchynska et al [27]). It is currently being researched as a photocatalyst and novel antifungal precursor.…”

Section: Introductionmentioning

confidence: 99%

Viability Study of a Safe Method for Health to Prepare Cement Pastes with Simultaneous Nanometric Functional Additions

Rubia

Lucas-Gil

Reyes

et al. 2018

Advances in Materials Science and Engineering

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e use of a mixing method based on a novel dry dispersion procedure that enables a proper mixing of simultaneous nanometric functional additions while avoiding the health risks derived from the exposure to nanoparticles is reported and compared with a common manual mixing in this work. Such a dry dispersion method allows a greater workability by avoiding problems associated with the dispersion of the particles. e two mixing methods have been used to prepare Portland cement CEM I 52.5R pastes with additions of nano-ZnO with bactericide properties and micro-or nanopozzolanic SiO 2 . e hydration process performed by both mixing methods is compared in order to determine the efficiency of using the method. e hydration analysis of these cement pastes is carried out at different ages (from one to twenty-eight days) by means of differential thermal analysis and thermogravimetry (DTA-TG), X-ray diffraction (XRD), scanning electron microscopy (SEM), and Fourier transform infrared spectroscopy (FTIR) analyses. Regardless of composition, all the mixtures of cement pastes obtained by the novel dispersion method showed a higher retardation of cement hydration at intermediate ages which did not occur at higher ages. In agreement with the resulting hydration behaviour, the use of this new dispersion method makes it possible to prepare homogeneous cement pastes with simultaneous functional nanoparticles which are physically supported on the larger particles of cement, avoiding exposure to the nanoparticles and therefore minimizing health risks. Manual mixing of cement-based materials with simultaneous nanometric functional nanoparticles on a large scale would make it difficult to obtain a homogenous material together with the health risks derived from the handling of nanoparticles.

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Effects of different compositions from magnetic and nonmagnetic dopants on structural and electrical properties of ZnO nanoparticles-based varistor ceramics

Cited by 14 publications

References 24 publications

Synthesis and characterization of ZnO based varistor ceramics: effect of sintering temperatures

Synthesis and characterization of ZnO based varistor ceramics: effect of sintering temperatures

Synergistic Effects of Pr6O11 and Co3O4 on Electrical and Microstructure Features of ZnO-BaTiO3 Varistor Ceramics

Viability Study of a Safe Method for Health to Prepare Cement Pastes with Simultaneous Nanometric Functional Additions

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