Study of the effect of substitution by MnO2 and V2O5 on the microstructure, electrical and dielectric characteristics of zinc oxide ceramics

Rady, K. E.; Desouky, Osama A.

doi:10.1140/epjp/i2016-16444-4

Cited by 6 publications

(4 citation statements)

References 26 publications

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“…where E1=1 mA, and E2= 0.1 mA. ZnO-Bi2O3-based varistor ceramics was significantly higher than undoped ZnO-Bi2O3-based varistor ceramic (from 706 for 0ZBM to 1221 for 05ZBM at 1kHz), which was ascribed to the improvement of potential barriers analyzed earlier [44], as shown in Fig. 7(a).…”

Section: Resultsmentioning

confidence: 66%

Flash Assisted Synthesis and Electrical Performance of MnO2-doped ZnO-Bi2O3-based Ceramics

Peng

Chen

Niu

et al. 2020

Preprint

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How to prepare high-performance ZnO-based varistor ceramics in a short time and at a low temperature remains a key challenge. Flash sintering method provides an effective approach to solve this challenge. Here, MnO2-doped ZnO-Bi2O3-based dense varistor composite ceramics were successfully prepared by the flash sintering method at the furnace temperature < 750 ℃ in 60 s under the DC electric field of 300 V⋅cm− 1. The effects of MnO2 on the onset of furnace temperature, specimen temperature, and specimen conductivity were systematically investigated in the flash sintering process. The results of flash sintering show that the onset of furnace temperature of ZnO-Bi2O3-based composite ceramic containing 0.5 mol% MnO2 is only 704 ℃, which is significantly lower than that of undoped ZnO-Bi2O3-based varistor ceramic. The measurement results of the electrical properties for all flash-sintered composite varistors ceramics show that the composite sample containing 0.5 mol% MnO2 has the best electrical performance parameters compared with the undoped ZnO-Bi2O3-based varistor ceramic. The flash-sintered ceramic containing 0.5 mol% MnO2 obtained the nonlinear coefficient of 18, the leakage current of 16.82 µA, and the dielectric constant of 1221 at 1 kHz.

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Section: Resultsmentioning

confidence: 66%

Flash Assisted Synthesis and Electrical Performance of MnO2-doped ZnO-Bi2O3-based Ceramics

Peng

Chen

Niu

et al. 2020

Preprint

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“…The dielectric constant of MnO 2 -doped ZnO-Bi 2 O 3based varistor ceramics was significantly higher than the undoped ZnO-Bi 2 O 3 -based varistor ceramic (from 706 for 0ZBM to 1,221 for 05ZBM at 1 kHz), which was ascribed to the improvement of potential barriers analyzed earlier (Rady and Desouky, 2016), as shown in Figure 11(a). Besides, the dielectric constant of the FS ceramics decreased slowly while the frequency increases from 10 3 to 10 7 Hz.…”

Section: Resultsmentioning

confidence: 77%

Microstructure and properties of ZnO-Bi₂O₃-based varistor ceramics via flash sintering

JIANG

Shi

et al. 2022

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Purpose This paper aims to study the effects of MnO2 on the ZnO–Bi2O3-based varistor prepared via flash sintering (FS) Design/methodology/approach MnO2-doped ZnO–Bi2O3-based varistors were successfully prepared by the FS with a step-wise increase of the .current in 60 s at the furnace temperature <750°C under the direct current electric field of 300 V cm−1. The FS process, microstructure and the electrical performance of ZnO–Bi2O3-based varistors were systematically investigated. Findings The doping of MnO2 significantly decreased the onset temperature of FS and improved the electrical performance of FS ZnO varistor ceramic. The sample with 0.5 mol% MnO2 doping shows the highest improvement, with the nonlinear coefficient of 18, the leakage current of 16.82 µA, the threshold voltage of 459 V/mm and the dielectric constant of 1,221 at 1 kHz. Originality/value FS is a wonderful technology to enhance ZnO varistors for its low energy consumption, and a short sintering time can reduce grain growth and inhabit Bi2O3 volatilize, yet few research studies work on that. In this research, the authors analyzed the FS process and improved the electrical characteristics through MnO2 doping.

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“…Maximum density was realized at temperature of 1000 °C, and above 1000 °C sintering temperature, the density of all examined samples decreased. This decrease can be attributed to the increase in intergranular porosity as a result of discontinuous grain growth [20,21]. The average crystallite size (D) BaZrTiO 5 ceramics has been calculated from x-ray data using Scherrer`s equation [22,23] and was found to increase with increasing Pr 6 O 11 content.…”

Section: Methodsmentioning

confidence: 99%

Effect of Pr6O11 Substitution on Structural and Dielectric Properties of BaZrTiO5 Ceramic Materials

Desouky

Rady

2021

Menoufia Journal of Electronic Engineering Research

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In the present work, we studied the effect of the substitution of BaO by Pr 6 O 11 , on the structure, dielectric and electrical properties of BaTiZrO 5 ceramics. Samples of general formula (99.2-x) Bao-xPr 6 O 11-0.5TiO 2-0.3ZrO 2 (x =0.1, 0.2, 0.5 and 0.6) named P 1 , P 2 , P 3 and P 4 respectively were prepared by conventional ceramic method. The structure of the prepared samples was studied using X-ray diffraction, water absorption % and SEM. Addition of Pr 6 O 11 minimized the presence of closed pores and thus led to improved densification. The crystallize size of the prepared samples was calculated and found in the range 22-26 nm. The effect of the substitution by Pr 6 O 11 on breakdown field, dielectric constant, ac resistivity was investigated. Finally, it was found that, the substitution BaO by Pr 6 O 11 improves the physical properties of BaTiZrO 5 ceramics by increasing their break down field, ac resistivity and dielectric constant that makes these ceramics useful in the technological applications.

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Study of the effect of substitution by MnO2 and V2O5 on the microstructure, electrical and dielectric characteristics of zinc oxide ceramics

Cited by 6 publications

References 26 publications

Flash Assisted Synthesis and Electrical Performance of MnO2-doped ZnO-Bi2O3-based Ceramics

Flash Assisted Synthesis and Electrical Performance of MnO2-doped ZnO-Bi2O3-based Ceramics

Microstructure and properties of ZnO-Bi₂O₃-based varistor ceramics via flash sintering

Effect of Pr6O11 Substitution on Structural and Dielectric Properties of BaZrTiO5 Ceramic Materials

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Study of the effect of substitution by MnO2 and V2O5 on the microstructure, electrical and dielectric characteristics of zinc oxide ceramics

Cited by 6 publications

References 26 publications

Flash Assisted Synthesis and Electrical Performance of MnO2-doped ZnO-Bi2O3-based Ceramics

Flash Assisted Synthesis and Electrical Performance of MnO2-doped ZnO-Bi2O3-based Ceramics

Microstructure and properties of ZnO-Bi2O3-based varistor ceramics via flash sintering

Effect of Pr6O11 Substitution on Structural and Dielectric Properties of BaZrTiO5 Ceramic Materials

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Microstructure and properties of ZnO-Bi₂O₃-based varistor ceramics via flash sintering