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

Cheng, Zhuolin; Li, Rou; Long, Yiwei; Li, Jianying; Li, Shengtao; Wu, Kangning

doi:10.26599/jac.2023.9220732

Cited by 17 publications

(3 citation statements)

References 43 publications

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“…In contrast, the power loss of the sample doped with .25 mol% Ni 2 O 3 initially reaches its maximum value but gradually decreases with time, stabilizing at a certain level. The steady decrease in power loss results from the increase in barrier height, essentially caused by the rearrangement of ions at the grain boundary at external voltage, resulting in a widening of the depletion layer 27,28 . This suggests that the introduction of an appropriate amount of Ni doping has a significantly positive impact on the aging stability of the SnO 2 varistor during extended operation.…”

Section: Resultsmentioning

confidence: 99%

Influence mechanism of Ni₂O₃ doping on leakage current of SnO₂ varistor ceramics

Sun,

Zhao,

Miao

2024

Int J Applied Ceramic Tech

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The doping of Ni2O3 has significantly enhanced the electrical properties and density of SnO2–Co3O4–Cr2O3–Nb2O5 varistor ceramics. The leakage current density is reduced to 4.73 µA/cm2, the nonlinear coefficient is 37, and the voltage gradient is 549 V/mm. The undoped varistor ceramics exhibited a considerably higher leakage current of 48.04 µA/cm2. The performance improvement comes from alterations in grain boundary parameters. The doping of an appropriate amount of Ni improves the grain boundary barrier of SnO2 varistor ceramics and makes samples obtain higher grain boundary resistance, which hinders the leakage current path and results in excellent nonohmic characteristics. The stable grain boundary barrier structure dominated by Ni enables the sample to obtain stable power loss performance under long‐term direct current (DC) bias.

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Section: Resultsmentioning

confidence: 99%

Influence mechanism of Ni₂O₃ doping on leakage current of SnO₂ varistor ceramics

Sun,

Zhao,

Miao

2024

Int J Applied Ceramic Tech

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“…ZrO2 [9], SiC [6], and more [10]. The formation and transition of GB complexion can cause abrupt changes in the chemistry and properties of GB, thereby critically influencing the sintering process, grain growth behavior, and many other boundary-sensitive properties of ceramics [11][12][13]. For example, Al2O3 ceramics may have different GB complexions depending on the added dopants and processing temperature [14,15].…”

Section: Introductionmentioning

confidence: 99%

An effective strategy to inhibit grain coarsening: Construction of multi-element co-segregated grain boundary complexion

Fu,

Arcuri,

et al. 2024

Journal of Advanced Ceramics

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When exposed to moderate to high temperatures, nanomaterials typically suffer from severe grain coarsening, which has long been a major concern that prevents their wider applications. Here, we proposed an effective strategy to inhibit grain coarsening by constructing grain boundary (GB) complexions with multiple dopants co-segregated, which hindered coarsening from both energetic and kinetic perspectives. As a demonstration of the feasibility of the strategy, multiple selected dopants were doped to a ZrO2-SiO2 nanocrystalline glass-ceramic (NCGC) to form GB complexions. Results showed that the NCGC was predominately composed of ZrO2 nanocrystallites (NCs) distributed in an amorphous SiO2 matrix. Ultrathin layers J u s t A c c e p t e d of GB complexions (~2.5 nm) were formed between adjacent ZrO2 NCs and they were crystalline superstructures with dopants co-segregated. In addition, a small amount of quartz solid solution was formed and it adhered to the periphery of ZrO2 NCs and bridged the adjacent NCs, acting as "bridging phase". The GB complexions and the "bridging phase" and synergistically enhanced the coarsening resistance of ZrO2 NCs up to 1000 ºC. These findings are important for understanding the GB complexions and are expected to provide new insights to design nanomaterials with excellent thermodynamic stability.

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“…The thermoset cross-linked polyethylene (XLPE) insulated power cable is in increasing demand due to the continued development of urbanization. However, the thorny problems, including high energy consumption during fabrication and recyclability after retirement, limit the sustainability of cable insulation. − Therefore, replacing thermosets with recyclable thermoplastics, such as polypropylene (PP) with superior insulating performance, has been proposed as an effective method to achieve the target. − Nevertheless, brittleness and low toughness make it difficult for PP to be directly used as a cable insulation. Although the problems can be solved by introducing elastomers, the sharp interface between the matrix and the rubber phase always leads to serious decline in the resistance against deformation and aging during its long-term operation at high temperatures. − …”

mentioning

confidence: 99%

Largely Improved Creep Resistance and Thermal-Aging Stability of Eco-Friendly Polypropylene High-Voltage Insulation by Long-Chain Branch-Induced Interfacial Constraints

Wu,

Sui,

Yang

et al. 2024

ACS Macro Lett.

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Polypropylene (PP)-based composites have attracted numerous attention as a replacement of prevailing cross-linked polyethylene (XLPE) for high-voltage insulation due to their ease of processing, recyclability, and excellent electrical performance. However, the poor resistances against high-temperature creep and thermal aging are obstacles to practical applications of PP-based thermoplastic high-voltage insulation. To address these problems, in this Letter, we synthesized an impact polypropylene copolymer (IPC) containing multifold long-chain branched (LCB) structures in phases, especially the interfaces between the PP matrix and the rubber phase. The results indicated that the structural stability of LCBIPC was significantly enhanced under extreme conditions. In comparison to IPC (without LCB structures), 24.1% less creep strain and 75.2% less unrecoverable deformation are achieved in LCBIPC at 90 °C. In addition, the thermal aging experiments were performed at 135 °C for 48 and 88 days for IPC and LCBIPC, respectively. The results show that the resistance against thermal aging was also enhanced in LCBIPC, which showed a 133% longer thermal aging life compared to IPC. Further results revealed that the interfacial layer between the PP matrix and the rubber phase was constructed in LCBIPC. The two phases are tightly linked by chemical bonds in LCB structures, leading to enforced constraints of the rubber phase at the micro level and better resistance performance against creep and thermal aging at the macro level. Evidently, the reported eco-friendly LCBIPC thermoplastic insulation shows great potential for applications in high-voltage cable insulation.

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

Cited by 17 publications

References 43 publications

Influence mechanism of Ni₂O₃ doping on leakage current of SnO₂ varistor ceramics

Influence mechanism of Ni₂O₃ doping on leakage current of SnO₂ varistor ceramics

An effective strategy to inhibit grain coarsening: Construction of multi-element co-segregated grain boundary complexion

Largely Improved Creep Resistance and Thermal-Aging Stability of Eco-Friendly Polypropylene High-Voltage Insulation by Long-Chain Branch-Induced Interfacial Constraints

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

Cited by 17 publications

References 43 publications

Influence mechanism of Ni2O3 doping on leakage current of SnO2 varistor ceramics

Influence mechanism of Ni2O3 doping on leakage current of SnO2 varistor ceramics

An effective strategy to inhibit grain coarsening: Construction of multi-element co-segregated grain boundary complexion

Largely Improved Creep Resistance and Thermal-Aging Stability of Eco-Friendly Polypropylene High-Voltage Insulation by Long-Chain Branch-Induced Interfacial Constraints

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Influence mechanism of Ni₂O₃ doping on leakage current of SnO₂ varistor ceramics

Influence mechanism of Ni₂O₃ doping on leakage current of SnO₂ varistor ceramics