Modeling of electrical transport in Zinc Oxide varistors

Bavelis, Konstantinos; Gjonaj, Erion; Weiland, Thomas

doi:10.5194/ars-12-29-2014

Cited by 17 publications

(8 citation statements)

References 13 publications

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“…Conocida como la figura de mérito del varistor, donde c es un parámetro y α es la conductancia dinámica [95]. Cabe destacar que si α=1, sería un material totalmente óhmico.…”

Section: Respuesta Eléctricaunclassified

Solid-state principles applied to organic–inorganic perovskites: new tricks for an old dog

2014

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“…Conocida como la figura de mérito del varistor, donde c es un parámetro y α es la conductancia dinámica [95]. Cabe destacar que si α=1, sería un material totalmente óhmico.…”

Section: Respuesta Eléctricaunclassified

Solid-state principles applied to organic–inorganic perovskites: new tricks for an old dog

2014

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“…Using these relatively high numbers of grains or grain boundaries and corresponding nonlinear resistors in simulations is certainly impractical, so we need a microstructure. Figure 9 shows a simplified varistor microstructure based on equal cubic grains or square grains on a mesh that represents all grains and boundaries [19,20]. We exploit this structure by using resistors only for grain boundaries.…”

Section: Varistor Microstructure Formation and Simulation Resultsmentioning

confidence: 99%

“…We need to additionally determine how to combine the resistors by considering grain shapes and grain amounts. In this regard, several studies have been proposed on varistor microstructures that considered grain shape and topology, as well as type and distribution of defects [19][20][21]. In a similar way, we present a simple yet accurate microstructure that solely consists of grain boundary resistors.…”

Section: Introductionmentioning

confidence: 95%

Distinct degradation processes in ZnO varistors: reliability analysis and modeling with accelerated AC tests

Yadavari¹,

Altun²

2017

Turk J Elec Eng & Comp Sci

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Abstract:In this study, we investigate different degradation mechanisms of zinc oxide (ZnO) varistors. We propose a model that shows how Vv (defined as DC varistor voltage when a 1-mA DC current is applied) changes with time for different stress levels. For this purpose, accelerated degradation tests are applied for different AC current levels and voltage values are then measured. Different from the common practice in the literature that considers degradation with only decreasing Vv values, we demonstrate either an increasing or a decreasing trend in the Vv parameter. The tests show a decreasing trend in Vv for current levels above a certain threshold and an increasing trend for current levels below this threshold. Considering both of these degradation mechanisms, we present a mathematical degradation model.The proposed model exploits the physics of the degradations for a single-grain boundary that is the core structure of a ZnO varistor. To validate the proposed model, we perform Monte Carlo simulations and the results are compared with those obtained from accelerated AC tests. As a summary of this study, we introduce a conceptual accelerated AC test methodology to analyze the reliability of the new ZnO varistor.

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“…1 shows cracks on the surfaces of a polycrystalline ZnO ceramic, along with some impurities and voids. 7,8) Fig. 1(a) shows a few simple types of cracks and Fig.…”

Section: Cracks Patterns Of Ceramicsmentioning

confidence: 99%

A Stochastic Model for Virtual Data Generation of Crack Patterns in the Ceramics Manufacturing Process

Hyun¹,

Hong²

2019

J. Korean Ceram. Soc

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Artificial intelligence with a sufficient amount of realistic big data in certain applications has been demonstrated to play an important role in designing new materials or in manufacturing high-quality products. To reduce cracks in ceramic products using machine learning, it is desirable to utilize big data in recently developed data-driven optimization schemes. However, there is insufficient big data for ceramic processes. Therefore, we developed a numerical algorithm to make "virtual" manufacturing data sets using indirect methods such as computer simulations and image processing. In this study, a numerical algorithm based on the random walk was demonstrated to generate images of cracks by adjusting the conditions of the random walk process such as the number of steps, changes in direction, and the number of cracks.

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Modeling of electrical transport in Zinc Oxide varistors

Cited by 17 publications

References 13 publications

Solid-state principles applied to organic–inorganic perovskites: new tricks for an old dog

Solid-state principles applied to organic–inorganic perovskites: new tricks for an old dog

Distinct degradation processes in ZnO varistors: reliability analysis and modeling with accelerated AC tests

A Stochastic Model for Virtual Data Generation of Crack Patterns in the Ceramics Manufacturing Process

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