Processing and characterizations of flash sintered ZnO-Bi2O3-MnO2 varistor ceramics under different electric fields

Mei, Yunzhu; Pandey, Shreevats; Long, Weimin; Liu, Juan; Zhong, Shengwen; Zhang, Lei; Du, Shigui; Xu, Dong

doi:10.1016/j.jeurceramsoc.2019.11.013

Cited by 44 publications

(14 citation statements)

References 48 publications

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“…5. Apparently, the grain size on both sides of the electrode did not change obviously, which is consistent with the previous reports [35]. Fig.…”

Section: Phase Structure Density and Microstructuresupporting

confidence: 93%

“…However, the research mainly focuses on the flash sintering of pure zinc oxide, and there are few investigations on the ZnO-based varistor. Recently, the ZnO-Bi 2 O 3 -MnO 2 varistors have been fabricated by the flash sintering at a very low sintering temperature of 768-702 ℃ under an electric field of 200-400 Vcm -1 , which showed an excellent nonlinear property [35]. The dense ZnO -Bi 2 O 3 -M (M = Cr 2 O 3 , MnO 2 , or Co 2 O 3 ) ceramics were obtained by flash sintering at a low temperature (< 750 ℃) with the highest nonlinear coefficient of 39.5 [36].…”

Section: Introduction mentioning

confidence: 99%

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Fabrication and electrical characteristics of flash-sintered SiO2-doped ZnO-Bi2O3-MnO2 varistors

et al. 2020

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The dense ZnO-Bi 2 O 3-MnO 2-xSiO 2 (ZBMS) varistors for x = 0, 1, 2, 3 wt% were fabricated by flash sintering method under the low temperature of 850 ℃ within 2 min. The sample temperature was estimated by a black body radiation model in the flash sintering process. The crystalline phase assemblage, density, microstructure, and electrical characteristics of the flash-sintered ZBMS varistors with different SiO 2-doped content were investigated. According to the XRD analysis, many secondary phases were detected due to the SiO 2 doping. Meanwhile, the average grain size decrease with increasing SiO 2-doped content. The improved nonlinear characteristics were obtained in SiO 2-doped samples, which can be attributed to the ion migration and oxygen absorption induced by the doped SiO 2. The flash-sintered ZBMS varistor ceramics for x = 2 wt% exhibited excellent comprehensive electrical properties, with the nonlinear coefficient of 24.5, the threshold voltage and leakage current of 385 Vmm-1 and 11.8 µA, respectively.

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“…5. Apparently, the grain size on both sides of the electrode did not change obviously, which is consistent with the previous reports [35]. Fig.…”

Section: Phase Structure Density and Microstructuresupporting

confidence: 93%

Section: Introduction mentioning

confidence: 99%

Fabrication and electrical characteristics of flash-sintered SiO2-doped ZnO-Bi2O3-MnO2 varistors

et al. 2020

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“…5. Apparently, the grain size on both sides of the electrode did not change obviously, which is consistent with the previous reports [35]. Where is the number of grain boundaries and is the average voltage per grain boundary.…”

Section: Phase Structure Density and Microstructuresupporting

confidence: 92%

“…However, the research mainly focuses on the ash sintering of pure zinc oxide, and there are few investigations on the ZnO-based varistor. Recently, the ZnO-Bi 2 O 3 -MnO 2 varistors have been fabricated by the ash sintering at a very low sintering temperature of 768-702 °C under an electric eld of 200-400 V×cm -1 , which showed an excellent nonlinear property [35]. The dense ZnO-Bi…”

Section: Introductionmentioning

confidence: 99%

Fabrication and electrical characteristics of flash-sintered SiO2-doped ZnO-Bi2O3-MnO2 varistors

Peng

Deng

Niu

et al. 2020

Preprint

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Abstract The dense ZnO-Bi2O3-MnO2-xSiO2 (ZBMS) varistors for x= 0, 1, 2, 3 wt.% were fabricated by flash sintering method under the low temperature of 850 ℃ within 2 minutes. The sample temperature was estimated by a black body radiation model in the flash sintering process. The crystalline phase assemblage, density, microstructure, and electrical characteristics of the flash-sintered ZBMS varistors with different SiO2 doped content were investigated. According to the XRD analysis, many secondary phases were detected due to the SiO2 doping. Meanwhile, the average grain size decrease with increasing SiO2-doped content. The improved nonlinear characteristics were obtained in SiO2-doped samples, which can be attributed to the ion migration and oxygen absorption induced by the doped SiO2. The flash-sintered ZBMS varistor ceramics for x=2 wt.% exhibited excellent comprehensive electrical properties, with the nonlinear coefficient of 24.5, the threshold voltage and leakage current of 385 V×mm-1 and 11.8 µA, respectively.

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“…The specimen was placed between two electrodes that were to improve the current flow between the Pt wires and the specimen. Based on our previous research, the electric field was set as 300 Vcm -1 [30]. The specimen was heated to 500 ℃ and then the electric field was provided until the flash was triggered with the initial current of 1.5 A.…”

Section: Fs Processingmentioning

confidence: 99%

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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Processing and characterizations of flash sintered ZnO-Bi2O3-MnO2 varistor ceramics under different electric fields

Cited by 44 publications

References 48 publications

Fabrication and electrical characteristics of flash-sintered SiO2-doped ZnO-Bi2O3-MnO2 varistors

Fabrication and electrical characteristics of flash-sintered SiO2-doped ZnO-Bi2O3-MnO2 varistors

Fabrication and electrical characteristics of flash-sintered SiO2-doped ZnO-Bi2O3-MnO2 varistors

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

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