Effect of Pr6O11 doping on the microstructure and electrical properties of ZnO varistors

Cao, Wenbin; Xie, Xin; Wang, Youqing; Chen, Minge; Yinan, Qiao; Wang, Pan; Zhang, Yunxia; Liu, Jianke

doi:10.1016/j.ceramint.2019.08.219

Cited by 32 publications

(5 citation statements)

References 34 publications

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“…respectively. Electrical properties, including the nonlinear coefficient α (α = 1/lg(U1mA/U0.1mA), the breakdown electric field strength Eb (Eb = U1mA/h), and the leakage current density JL (the current density under 0.75U1mA) are derived from the nonlinear J-E characteristics [31][32][33]. As for the sample aged in air, small changes in Eb, α and JL are observed in the reverse direction.…”

Section: Transition Of the Power Lossmentioning

confidence: 99%

Power loss transition of stable ZnO varistor ceramics: Role of oxygen adsorption on the stability of interface states at the grain boundary

Cheng¹,

Li²,

Long³

et al. 2023

Journal of Advanced Ceramics

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Highly stable ZnO varistor ceramics with steadily decreasing power loss have been put into applications in electrical and electronic systems for overvoltage protections, even with the absence of general understandings on their aging behaviors. In this paper, we investigated their aging nature via conducting comparative dc aging experiments both in air and in nitrogen, during which variations of electrical properties and interface properties were measured and analyzed. Notably, continuously

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Section: Transition Of the Power Lossmentioning

confidence: 99%

Power loss transition of stable ZnO varistor ceramics: Role of oxygen adsorption on the stability of interface states at the grain boundary

Cheng¹,

Li²,

Long³

et al. 2023

Journal of Advanced Ceramics

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“…The role of MO additives is to enhance the performance of MOVs through a synergistic effect [ 14 ]. For example, Bi 2 O 3 [ 15 , 16 ], V 2 O 5 [ 17 , 18 ], and Pr 6 O 11 [ 19 ] are varistor-forming oxides (VFOs) or nonlinearity inducers that can form solid solutions with other MOs. Varistor-enhancing dopants (VEDs) act as grain growth inhibitors and densification enhancers and are selected from rare earth oxides (REOs) such as Er 2 O 3 [ 20 , 21 , 22 ], Gd 2 O 3 [ 23 ], Dy 2 O 3 [ 24 ], Sm 2 O 3 [ 25 ], Y 2 O 3 [ 25 , 26 , 27 ], La 2 O 3 , and CeO 2 [ 28 ], among others.…”

Section: Introductionmentioning

confidence: 99%

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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“…The main electrical parameters of ZnO based varistors include breakdown electric field (Eb) and nonlinear coefficient (α), Typically, a variety of metal oxides such as Bi2O3, Co2O3, MnO2, Sb2O3, SiO2, etc. [12][13][14][15][16][17][18][19][20] are sintered into ZnO to form the Schottky barriers at the grain boundaries and improve the overall electrical 4 performances under conventional sintering conditions with temperatures from ~1000 to 1200℃.…”

Section: Introductionmentioning

confidence: 99%

Preparation of zinc oxide/poly-ether-ether-ketone (PEEK) composites via the cold sintering process

Hao

Zhao

et al. 2021

Acta Materialia

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Effect of Pr6O11 doping on the microstructure and electrical properties of ZnO varistors

Cited by 32 publications

References 34 publications

Power loss transition of stable ZnO varistor ceramics: Role of oxygen adsorption on the stability of interface states at the grain boundary

Power loss transition of stable ZnO varistor ceramics: Role of oxygen adsorption on the stability of interface states at the grain boundary

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

Preparation of zinc oxide/poly-ether-ether-ketone (PEEK) composites via the cold sintering process

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