Effect of Zn doping on stability of ZnO varistors under high pulse-current stress

Jiang, Shenglin; Wang, Yaping; Zhang, Xiaoshan; Ye, Xu; Liu, Pin; Zeng, Yanan; Wang, Qing; Zhang, Guangzu

doi:10.1016/j.ceramint.2015.05.120

Cited by 11 publications

(2 citation statements)

References 25 publications

(34 reference statements)

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“…On the contrary, the trapping away of interstitials far from the GBs can occur during the cooling of ZnO-based systems. This phenomenon can have a significant impact on the stability of MOVs [ 159 ].…”

Section: Considerations Of the Crystalline Structure And Physics Of Z...mentioning

confidence: 99%

“…The degradation rate of the MOVs from the ZnO-based systems can be reduced when the Zn i density is lower, since Zn i represents the major intrinsic point defect species that generates the electrical degradation of MOVs under DC or AC electrical and thermal stresses [ 159 , 201 ]. Additionally, the Zn i density is an effective parameter for investigating the electrical degradation of ZnO-based varistors at a macroscopic level.…”

Section: Properties Of Disc-shaped Movs From Zno-v 2 ...mentioning

confidence: 99%

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Effects of Dopants and Processing Parameters on the Properties of ZnO-V2O5-Based Varistors Prepared by Powder Metallurgy: A Review

Lungu¹

2023

Materials

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This article reviews the progress in developing ZnO-V2O5-based metal oxide varistors (MOVs) using powder metallurgy (PM) techniques. The aim is to create new, advanced ceramic materials for MOVs with comparable or superior functional properties to ZnO-Bi2O3 varistors using fewer dopants. The survey emphasizes the importance of a homogeneous microstructure and desirable varistor properties, such as high nonlinearity (α), low leakage current density (JL), high energy absorption capability, reduced power loss, and stability for reliable MOVs. This study investigates the effect of V2O5 and MO additives on the microstructure, electrical and dielectric properties, and aging behavior of ZnO-based varistors. The findings show that MOVs with 0.25–2 mol.% V2O5 and MO additives sintered in air over 800 °C contain a primary phase of ZnO with a hexagonal wurtzite structure and several secondary phases that impact the MOV performance. The MO additives, such as Bi2O3, In2O3, Sb2O3, transition element oxides, and rare earth oxides, act as ZnO grain growth inhibitors and enhance the density, microstructure homogeneity, and nonlinearity. Refinement of the microstructure of MOVs and consolidation under appropriate PM conditions improve their electrical properties (JL ≤ 0.2 mA/cm2, α of 22–153) and stability. The review recommends further developing and investigating large-sized MOVs from the ZnO-V2O5 systems using these techniques.

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Section: Considerations Of the Crystalline Structure And Physics Of Z...mentioning

confidence: 99%

Section: Properties Of Disc-shaped Movs From Zno-v 2 ...mentioning

confidence: 99%