Results 161 to 170 of about 215,655 (219)

Rate-controlled shrinkage of ZnO varistors

Journal of Materials Processing Technology, 1996
Abstract Shrinkage of ZnO varistors has been controlled during the firing process at a constant rate using a feed back loop to control the heating rate. This was accomplished by developing software which calculates the shrinkage from a signal coming from a displacement transducer, then it compares the current shrinkage rate with a previously set ...
A. Al-Tounsi, R. Puyané, M.S.J. Hashmi
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Effect of ZnBi2O4 and Bi2O3 addition on the densification, microstructure, and varistor properties of ZnO varistors

Ceramics International, 2022
H. Hsiang, Chih‐Cheng Chen, C. Kao
semanticscholar   +1 more source

Impedance and Modulus Spectroscopy of ZnO Varistors

Journal of Electroceramics, 1997
The ac response of ZnO varistors has been investigated over thetemperature range 100 to 380°C using impedance and modulusspectroscopy. Impedance spectra show only a single peak, which representsthe most resistive component in the sample and is responsible for the dcproperties, whereas an additional peak appears in the modulus spectrum.
A.R. West, M. Andres-Verges
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Intrinsic defects in ZnO varistors

Journal of Applied Physics, 1983
Theoretical calculations are presented for equilibrium concentrations of zinc and oxygen vacancies in ZnO. Results are presented at the sintering temperature, and also at room temperature. Theoretical calculations of reaction constants show that the intrinsic donor is the oxygen vacancy, rather than the zinc interstitial.
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The effect of grinding media on suspensions, microstructures, and comprehensive electrical properties of ZnO varistors

Journal of materials science. Materials in electronics, 2022
Fahimehsadat Abedsaeidi, Akbar Amini, F. Norouzian, Meysam Kahkhaei Javan, M. Maleki Shahraki   +4 more
semanticscholar   +1 more source

Cooling rate effects in ZnO varistors

Journal of Materials Science: Materials in Electronics, 1992
Cooling rate effects on ZnO-Bi2O3 varistors are presented. In particular, the oxygen vacancies (V o + ) concentration was determined by electron paramagnetic resonance (EPR) spectroscopy and related to the conductivity. It was found that a higher cooling rate provokes an increase of the V
M. S. Castro, L. Perissinotti, C. M. Aldao   +2 more
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Study on the high impulse current withstand properties and failure mechanism of ZnO varistors with different Bi2O3 content

Journal of Materials Science: Materials in Electronics, 2022
Bo-wen Wang, Jiayao Lu, P. Gao, Zhiyao Fu, Zhenglong Jiang   +4 more
semanticscholar   +1 more source

Effect of Sintering Temperature on the Microstructural Evolution of ZnO Varistors

Journal of Electronic Materials, 2022
Wenbin Cao, Jinfeng Su, Jiaojiao Chen, Shihua Liu, Qiaobo Zhu, Ruifeng Xu, Li Zhizhi, Liu Jianke   +7 more
semanticscholar   +1 more source

Evaluation of ZnO Varistors by Photoacoustic Spectroscopy

Japanese Journal of Applied Physics, 2001
ZnO varistors degraded under various conditions were evaluated by photoacoustic spectroscopy (PAS). The degradation where the grain boundary is damaged by DC bias stress is more than that by AC bias stress. PAS, however, reveals that the interior of the grains of the sample degraded by AC bias stress is much more damaged than that by the DC bias ...
Yasuhiro Ohbuchi Yasuhiro Ohbuchi, Akitsugu Kimura Akitsugu Kimura, Toshio Kawahara Toshio Kawahara, Jun Morimoto Jun Morimoto, Taro Toyoda Taro Toyoda   +4 more
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Pulse response characteristics of ZnO varistors

Journal of Applied Physics, 1990
A study is reported of the influences of temperature, circuit resistance, and pulse repetition rate on the ZnO varistor inductive pulse response that is disclosed by voltage overshoot and current undershoot. Exponential time constants are fitted to the voltage overshoot and the current undershoot obtained by using high- and low-impedance pulse supplies,
F. A. Modine, R. B. Wheeler
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