Voltage Enhancement of ZnO Oxide Varistors for Various Y<sub>2</sub>O<sub>3</sub>Doping Compositions

Yoon, Jung-Rag; Lee, Chang‐Bae; Lee, Kyung-Min; Lee, Heun-Young; Lee, Serk-Won

doi:10.4313/teem.2009.10.5.152

Cited by 8 publications

(1 citation statement)

References 6 publications

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“…Similar results were obtained (see Refs. [41], [42], and [43]). The relations between conductivity and frequency for different mixes are shown Fig.…”

Section: -3mentioning

confidence: 99%

Improvement of sintering, nonlinear electrical, and dielectric properties of ZnO-based varistors doped with TiO₂

Desouky

Rady

2016

Chinese Phys. B

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The effects of TiO 2 on sintering and nonlinear electrical properties of (98.5 − x)ZnO-0.5MnO 2 -0.5Co 2 O 3 -0.5Bi 2 O 3 -xTiO 2 (x = 0.3, 0.5, 0.7, 0.9 mol%) ceramic varistors prepared by the ceramic technique are investigated in this work. The optimum sintering temperature of the prepared samples is deduced by determining the firing shrinkage and water absorption percentages. The optimum sintering temperature is found to be 1200 • C, at which each of the samples shows a maximum firing shrinkage and minimum water absorption. Also minimum water absorption appears in a sample of x = 0.9 mol%. Higher sintering temperature and longer sintering time give rise to a reduction in bulk density due to the increased amount of porosity between the large grains of ZnO resulting from the rapid grain growth induced by the liquid phase sintering. The crystal size of ZnO decreases with increasing TiO 2 doping. The addition of TiO 2 improves the nonlinear coefficient and attains its maximum value at x = 0.7 mol% of TiO 2 , further addition negatively affects it. A decrease in capacitance consequently in the dielectric constant is recorded with increasing the frequency in a range of 30 kHz-200 kHz. The temperature and composition dependences of the dielectric constant and AC conductivity are also studied. The increase of temperature raises the dielectric constant because it increases ionic response to the field at any particular frequency.

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“…Similar results were obtained (see Refs. [41], [42], and [43]). The relations between conductivity and frequency for different mixes are shown Fig.…”

Section: -3mentioning

confidence: 99%

Improvement of sintering, nonlinear electrical, and dielectric properties of ZnO-based varistors doped with TiO₂

Desouky

Rady

2016

Chinese Phys. B

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Correlation between electrical properties and crystalline phases for ZnO-Bi2O3 based varistor ceramics with rare earth additives

Kato

Takada

2013

J Electroceram

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In this study, the correlation between the electrical properties and crystalline phases of ZnO-Bi 2 O 3 based varistor ceramics with rare earth additives was investigated. The additives used were in the form R 2 O 3 , where R represents Eu, Ho, Y, Er, Yb, or Lu. It was found that the incorporation of rare earth additives led to an increase in the varistor voltage in the nonlinear region, an increase in the leakage current in the pre-breakdown region, and a reduction in the limiting voltage in the upturn region. In the sample with added Y 2 O 3 , a phase referred to as the R-phase, which contained Y, Bi, Sb, Zn, Mn, and O, was observed to be homogeneously distributed at ZnO grain boundaries. X-ray diffraction analysis revealed that the amount of the Zn-Sb-O spinel and Bi-Cr-O phases present was reduced by the rare earth addition, and that rare earth elements were incorporated into a common crystalline phase. It is suggested that the formation of the R-phase at ZnO grain boundaries and the reduction in the Bi 2 O 3 liquid phase during the sintering process might be responsible for suppressing ZnO grain growth, thus leading to an increase in the varistor voltage.

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Enhanced non-linear current-voltage response of Te-doped calcium copper titanate ceramics

Barman

Varma

2017

Ceramics International

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Voltage Enhancement of ZnO Oxide Varistors for Various Y₂O₃Doping Compositions

Cited by 8 publications

References 6 publications

Improvement of sintering, nonlinear electrical, and dielectric properties of ZnO-based varistors doped with TiO₂

Improvement of sintering, nonlinear electrical, and dielectric properties of ZnO-based varistors doped with TiO₂

Correlation between electrical properties and crystalline phases for ZnO-Bi2O3 based varistor ceramics with rare earth additives

Enhanced non-linear current-voltage response of Te-doped calcium copper titanate ceramics

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Voltage Enhancement of ZnO Oxide Varistors for Various Y2O3Doping Compositions

Cited by 8 publications

References 6 publications

Improvement of sintering, nonlinear electrical, and dielectric properties of ZnO-based varistors doped with TiO2

Improvement of sintering, nonlinear electrical, and dielectric properties of ZnO-based varistors doped with TiO2

Correlation between electrical properties and crystalline phases for ZnO-Bi2O3 based varistor ceramics with rare earth additives

Enhanced non-linear current-voltage response of Te-doped calcium copper titanate ceramics

Contact Info

Product

Resources

About

Voltage Enhancement of ZnO Oxide Varistors for Various Y₂O₃Doping Compositions

Improvement of sintering, nonlinear electrical, and dielectric properties of ZnO-based varistors doped with TiO₂

Improvement of sintering, nonlinear electrical, and dielectric properties of ZnO-based varistors doped with TiO₂