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to activate the diffusion of the specific defects . The degradation behaviour of SnO -based varistors (SCNCr) due to current pulses (8/20 µs) is reported here for the first time in comparison with the ZnO -based ...
electrical degradation phenomena. These defects were assumed to be much larger than the characteristic size of the zinc oxide ( ZnO ) grain structure, and our computational method treated the varistor material ...
The relationship between the electrical characteristics of the ZnO varistors and applied current impulse is investigated in this study. The degradation phenomena of the ZnO varistors due to current ...
物理学报 Acta Phys. Sin. Vol. 62, No. 7 (2013) 077701 直流老化及热处理对 ZnO 压敏陶瓷缺陷结构的影响 赵学童 李建英 贾然 李盛涛 (西安交通大学电力设备电气绝缘国家重点实验室,西安 710049 ) ( 2012年 10 月 12 日收到; 2012年 11 月 22 日收到修改稿 ) 在电场为 3.2 kV/cm, 电流密度为 50 mA ...
The ZnO varistor degradation has been attributed to the field-assisted, temperature-activated diffusion of interstitial zinc in the depletion layer. To improve stability, one approach is to reduce ...
; the current creep phenomenon above results from the migration of the interface O’o by the biasing voltage. We suggest an improved grain boundary defect model for the ZnO varistors by deep heat treatment ...
increases, the barrier height and the defects of ZnO varistors increase with the increase of Co2O3 content, and the barrier height decreases at a certain degree after AC ageing test. As the Co2+ ion radius ...
A novel immersion process was carried out to improve the electrical stability of ZnO varistors under a dc electrical field. It was performed by dipping the conventionally sintered ZnO varistor ...
In this review paper detailed development of the ZnO –Bi2O3 based polycrystalline varistors are presented as the technological importance emerged with the rapid applications of the gapless surge ...
Abstract Photoluminescence (PL) measurements were carried out on commercial ZnO varistor samples that were electrically stressed and/or annealed at different temperatures. Changes in the intensity ...
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