Two-step sintering of ZnO varistors

Shahraki, Mohammad Maleki; Shojaee, S.A.; Sani, Mohammad Ali Faghihi; Nemati, Ali; Safaee, Iman

doi:10.1016/j.ssi.2010.06.026

Cited by 34 publications

(3 citation statements)

References 37 publications

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“…Mazaheri et al [22] confirmed the triple-point drag mechanism for controlled grain growth at the second-step sintering proposed by Chen and Wang [15] by using TEM image of two-step sintered ZnO compacts. ZnO sintered via TSS exhibited excellent I-V characteristics [16,74,76]. ZnO varistors sintered via TSS exhibited higher breakdown field of 6-8 kVmm −1 and nonlinear coefficient of over 270 due to fine grain size and high concentration of ZnO-ZnO grain contacts [16].…”

Section: Sintering Of Zinc Oxidementioning

confidence: 99%

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Two-Step Sintering of Ceramics

Sutharsini¹,

Murugathas²,

RameshSingh³

2018

Sintering of Functional Materials

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Sintering is a critical phase in the production of ceramic bodies. By controlling the density and microstructure formation, sintering now emerged as a processing technology of ceramic materials. Tailoring the structural, mechanical, electrical, magnetic and optical properties is widening the application of ceramics in various fields. Recently, many advanced sintering methods have reported to fabricate ceramic materials with controlled properties. Two-stage sintering (TSS) is one of the simple and cost-effective methods to obtain near-theoretical density materials with controlled grain growth without adding any dopants. Many recent works have reported the use of TSS as a processing method to fabricate nanoceramics for various applications. With this background, this chapter reviews the advantages of TSS in ceramic preparation based on properties and materials and explores the future directions.

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Section: Sintering Of Zinc Oxidementioning

confidence: 99%

“…Electrical and optical properties of ZnO are mainly influenced by grain size. Grain growth of ZnO was successfully controlled using TSS [16,20,22,[74][75][76][77][78]. Zhang et al [20] and others [16] successfully sintered fully dense ZnO without grain growth at the final stage of sintering.…”

Section: Sintering Of Zinc Oxidementioning

confidence: 99%

Two-Step Sintering of Ceramics

Sutharsini¹,

Murugathas²,

RameshSingh³

2018

Sintering of Functional Materials

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“…It was reported that the high E 1mA of 800 V/mm was achieved by using nano powers with nonlinear coefficients (α) of approximately 20 [5,20]. Similarly, ZnO varistors, with a high α of 96, were prepared but followed by the high leakage current density (J L ) of 50 µA/cm 2 [21]. This is because a small grain size would increase the number of grain boundaries which would weaken the Schottky barrier and lower its barrier height, resulting in a low α and high J L .…”

Section: Introductionmentioning

confidence: 99%

Simultaneously Enhanced Potential Gradient and Nonlinearity of ZnO Varistor Ceramics by MnO Doping with Nano-Sized ZnO Powders

Wang

Hou

et al. 2021

Materials

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ZnO varistor ceramics with a high potential gradient, as well as a high nonlinear coefficient, were reported and analyzed in this paper. With the use of nano-sized ZnO powders, the average grain size was reduced to about 2.6 μm, which successfully raised the potential gradient to 1172 V/mm. Moreover, the nonlinear coefficient increased to 48, and the leakage current was decreased to 8.4 μA/cm2 by doping a moderate amount of MnO (0.9 mol%). This was proven to be caused by the high Schottky barrier height formed at the grain boundary, where the Mn element segregated and, consequently, led to the increased density of interface states. Therefore, this could be considered as a potential method to simultaneously enhance the potential gradient and the nonlinear coefficient of ZnO varistor ceramics.

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Zinc Oxide Nanoparticles for Varistors

Diwald

2021

Metal Oxide Nanoparticles

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Two-step sintering of ZnO varistors

Cited by 34 publications

References 37 publications

Two-Step Sintering of Ceramics

Two-Step Sintering of Ceramics

Simultaneously Enhanced Potential Gradient and Nonlinearity of ZnO Varistor Ceramics by MnO Doping with Nano-Sized ZnO Powders

Zinc Oxide Nanoparticles for Varistors

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