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Enhanced dielectric and ferroelectric properties of the hybrid-doped BaTiO3 ceramics by the semi-solution method EI SCIE
期刊论文 | 2021 , 47 (11) , 15661-15667 | CERAMICS INTERNATIONAL
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Abstract :

In the present study, an industrially viable ceramics fabrication way based on solid-state reaction method-semisolution method was used to improve the dielectric and ferroelectric properties of acceptor-donor co-doped BaTiO3 ceramics. Unlike the conventional solid-state reaction method, additives in the semi-solution method were introduced in the form of the aqueous solution rather than oxide powders. Experiment results show that higher peak dielectric constant epsilon(max) (140-150%), larger maximum polarization P-max (24 mu C cm-(2)), and less apparent aging phenomena were achieved by the semi-solution method. A comprehensive microscopic analysis was carried out to explore the origin of property enhancement. Results show that enhanced properties could be ascribed to the higher level of compositional homogeneity and lower content of oxygen vacancies. This study provides a new method to control aging phenomena and achieve property enhancement in acceptor-donor codoped ceramics. Moreover, this simple and cost-effective method may also find its application in other extensivedoped ceramics.

Keyword :

Ferroelectrics Barium titanate Solid-state reaction method Hybrid-doping Defect chemistry Aging phenomena

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GB/T 7714 Gao, Jinghan , Liu, Wenfeng , Zhang, Lei et al. Enhanced dielectric and ferroelectric properties of the hybrid-doped BaTiO3 ceramics by the semi-solution method [J]. | CERAMICS INTERNATIONAL , 2021 , 47 (11) : 15661-15667 .
MLA Gao, Jinghan et al. "Enhanced dielectric and ferroelectric properties of the hybrid-doped BaTiO3 ceramics by the semi-solution method" . | CERAMICS INTERNATIONAL 47 . 11 (2021) : 15661-15667 .
APA Gao, Jinghan , Liu, Wenfeng , Zhang, Lei , Kong, Fanyi , Zhao, Yi , Li, Shengtao . Enhanced dielectric and ferroelectric properties of the hybrid-doped BaTiO3 ceramics by the semi-solution method . | CERAMICS INTERNATIONAL , 2021 , 47 (11) , 15661-15667 .
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Analytical Model of Micropyramidal Capacitive Pressure Sensors and Machine-Learning-Assisted Design SCIE
期刊论文 | 2021 , 6 (12) | ADVANCED MATERIALS TECHNOLOGIES
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Abstract :

Flexible micro-pyramidal capacitive pressure sensors provide a high-level tunability, showing fascinating implications in various applications, such as advanced healthcare, protheses, and smart robots. In this work, analytical models for capacitive pressure sensors are reported based on micro-pyramidal electrodes and dielectrics, which are confirmed by both finite element simulations and existing experimental results. The proposed models can be used to predict the pressure response in a wide dynamic range, which enables to efficiently analyze the pressure range, linearity, and multiple regimes of sensitivity for designing devices. Moreover, neural networks are introduced to approximate the pressure responses, and, in turn, to inversely design the parameters of the pressure sensors with a desired pressure response. The machine-learning-assisted design is able to find multiple designed parameters for the customization purpose, manifesting itself a powerful approach to customize the sensor performance.

Keyword :

flexible capacitive pressure sensor neural networks machine learning micropyramids inverse design

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GB/T 7714 Ma, Chao , Li, Gang , Qin, Longhui et al. Analytical Model of Micropyramidal Capacitive Pressure Sensors and Machine-Learning-Assisted Design [J]. | ADVANCED MATERIALS TECHNOLOGIES , 2021 , 6 (12) .
MLA Ma, Chao et al. "Analytical Model of Micropyramidal Capacitive Pressure Sensors and Machine-Learning-Assisted Design" . | ADVANCED MATERIALS TECHNOLOGIES 6 . 12 (2021) .
APA Ma, Chao , Li, Gang , Qin, Longhui , Huang, Weicheng , Zhang, Hongrui , Liu, Wenfeng et al. Analytical Model of Micropyramidal Capacitive Pressure Sensors and Machine-Learning-Assisted Design . | ADVANCED MATERIALS TECHNOLOGIES , 2021 , 6 (12) .
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Thermal-oxidative aging effects on the dielectric properties of nuclear cable insulation EI SCIE PubMed
期刊论文 | 2020 , 13 (10) | Materials | IF: 3.623
WoS CC Cited Count: 5
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Abstract :

In order to satisfy demands of cable insulation for nuclear power, a low-smoke, halogen-free flame retardant and better cryogenic property insulation was prepared. The effect of thermal-oxidative aging on the dielectric properties was researched in this paper. The changes of chemical structure and thermal-oxidative stability caused by aging were characterized by Fourier transform infrared spectroscopy and a differential scanning calorimeter. The results showed that, the oxidative-induced stability reduced as complex products accumulated during aging. The dielectric properties including polarity, conductivity and breakdown at different aging stages were measured. For comparison, tensile testing was performed. The parameters related to conductivity changed notably, and were comparable with the changes in mechanical properties. © 2020 by the authors.

Keyword :

Dielectric properties Insulating materials Nuclear fuels Smoke Fourier transform infrared spectroscopy Thermal insulation Cable sheathing Tensile testing Differential scanning calorimetry Chemical stability

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GB/T 7714 Chi, Xiaohong , Li, Jianxi , Ji, Minzun et al. Thermal-oxidative aging effects on the dielectric properties of nuclear cable insulation [J]. | Materials , 2020 , 13 (10) .
MLA Chi, Xiaohong et al. "Thermal-oxidative aging effects on the dielectric properties of nuclear cable insulation" . | Materials 13 . 10 (2020) .
APA Chi, Xiaohong , Li, Jianxi , Ji, Minzun , Liu, Wenfeng , Li, Shengtao . Thermal-oxidative aging effects on the dielectric properties of nuclear cable insulation . | Materials , 2020 , 13 (10) .
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Significant enhancement of energy storage properties of BaTiO3-based ceramics by hybrid-doping EI SCIE Scopus
期刊论文 | 2020 , 843 | Journal of Alloys and Compounds | IF: 5.316
WoS CC Cited Count: 5 SCOPUS Cited Count: 6
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In the present study, we designed a new system, Ba(Ti0.99-1.25xMn0.01Nbx)O3 (x = 0.5%, 1.0%, 1.25%, 1.5%), to improve the energy storage properties of BaTiO3–based ceramics. Here the acceptor dopant Mn was introduced to enhance the maximum polarization Pmax while reducing the remnant polarization Pr by inducing aging phenomena. The donor dopant Nb was added to make the hysteresis loop slimmer and slender through ‘softening’ effect. And the ratio of acceptor and donor was adjusted to modify the energy storage properties by modulating the shape of hysteresis loop. Results showed that an enhancement of 76% over pure BaTiO3 in recoverable energy storage density (Wrec) has been achieved in hybrid-doped samples, accompanied by a high energy conversion efficiency (η) up to 86%. Hereinto, donor-dominant samples doped with 1% Mn and 1.25% Nb exhibited the highest Wrec and η with excellent thermal stability. This study proved the feasibility of enhancing the energy storage properties by hybrid doping and may provide a new viewpoint for later studies. © 2020 Elsevier B.V.

Keyword :

Manganese Polarization Hysteresis Barium titanate Niobium Energy storage Hysteresis loops Conversion efficiency

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GB/T 7714 Liu, Wenfeng , Gao, Jinghan , Zhao, Yi et al. Significant enhancement of energy storage properties of BaTiO3-based ceramics by hybrid-doping [J]. | Journal of Alloys and Compounds , 2020 , 843 .
MLA Liu, Wenfeng et al. "Significant enhancement of energy storage properties of BaTiO3-based ceramics by hybrid-doping" . | Journal of Alloys and Compounds 843 (2020) .
APA Liu, Wenfeng , Gao, Jinghan , Zhao, Yi , Li, Shengtao . Significant enhancement of energy storage properties of BaTiO3-based ceramics by hybrid-doping . | Journal of Alloys and Compounds , 2020 , 843 .
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Review of electrical properties for polypropylene based nanocomposite Scopus SCIE
期刊论文 | 2018 , 10 , 221-225 | Composites Communications
WoS CC Cited Count: 19 SCOPUS Cited Count: 17
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Abstract :

© 2018 Polypropylene (PP), is one of the most widely used dielectric materials in electrical industry, especially in power capacitors and power cables. The requirement of higher electrical properties of PP by the rapid development of power system made the nanocomposite to be a promising solution to modify PP based dielectrics. In this review, we focused on the electrical properties and systematically gave an overview of PP based nanocomposite researches for power equipment application in recent years. We categorized the electrical properties into breakdown strength, dielectric permittivity, and long-term electrical performance, and summarized the correlations between enhanced properties and nanofiller types both experimentally and theoretically. Based on the achieved approaches, prospects for the future research on PP based nanocomposite was proposed, which may provide a worth-considering direction for the future work.

Keyword :

Dielectric Nanocomposite Polypropylene

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GB/T 7714 Liu, Wenfeng , Cheng, Lu , Li, Shengtao . Review of electrical properties for polypropylene based nanocomposite [J]. | Composites Communications , 2018 , 10 : 221-225 .
MLA Liu, Wenfeng et al. "Review of electrical properties for polypropylene based nanocomposite" . | Composites Communications 10 (2018) : 221-225 .
APA Liu, Wenfeng , Cheng, Lu , Li, Shengtao . Review of electrical properties for polypropylene based nanocomposite . | Composites Communications , 2018 , 10 , 221-225 .
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A Statistical Approach for Effectively Analyzing the Grain Size Distribution Along the Thickness Direction in Commercial ZnO-Based Varistor Ceramics EI
会议论文 | 2018 | 7th International Conference on Condition Monitoring and Diagnosis, CMD 2018
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Grain size and its spatial distribution are the crucial issues in the study of advanced materials with a grain-grain boundary structure. It not only implies the grain growth mechanism of those materials, but also determines most of their macroscopic properties, such as mechanical strength, current conduction, ageing and so on. Therefore, it is of importance to clarify the grain size distribution (GSD) in ZnO-based varistor ceramics, a key protection element against overvoltage. In the present paper, a new approach based on the log-normal distribution was proposed to analyze the variation of GSD along the thickness direction of two commercial ZnO varistors. It is found that GSD follows log-normal distribution rather than commonly used normal distribution. In addition, with the proposed grain size, i.e., averaged log-normal grain size (dLN) and most probable grain size (dmax), the variation of GSD along the thickness direction was clearly revealed, which exhibited quite different behavior depending on the samples. With the probability plot, the microscopic uniformity is carefully analyzed and discussed. It is proposed that probability plots can be divided into three regions, representing large grains, grains whose sizes follow the lognormal rule and small grains, respectively. With the proposed method, it is possible to obtain more quantitative information, which is of significance for the further development of ZnO-based varistor ceramics and other advanced materials. © 2018 IEEE.

Keyword :

Grain-grain boundaries Grain growth mechanisms Grain size distribution Log-normal distribution Macroscopic properties Probability plot Quantitative information Zno-based varistor ceramics

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GB/T 7714 Zhang, Lei , Yu, Chuan , Zhang, Le et al. A Statistical Approach for Effectively Analyzing the Grain Size Distribution Along the Thickness Direction in Commercial ZnO-Based Varistor Ceramics [C] . 2018 .
MLA Zhang, Lei et al. "A Statistical Approach for Effectively Analyzing the Grain Size Distribution Along the Thickness Direction in Commercial ZnO-Based Varistor Ceramics" . (2018) .
APA Zhang, Lei , Yu, Chuan , Zhang, Le , Liu, Wenfeng , Wu, Kangning , Li, Shengtao et al. A Statistical Approach for Effectively Analyzing the Grain Size Distribution Along the Thickness Direction in Commercial ZnO-Based Varistor Ceramics . (2018) .
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Characterization of Polypropylene Modified by Blending Elastomer and Nano-Silica EI SCIE PubMed Scopus
期刊论文 | 2018 , 11 (8) | MATERIALS | IF: 2.972
WoS CC Cited Count: 22 SCOPUS Cited Count: 26
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Abstract :

Polypropylene (PP) contains promising application prospects in thermoplastic cables for high voltage direct current (HVDC) power transmission because of its outstanding thermal and dielectric properties. However, the problem of poor toughness and space charge has restricted the application of pure PP in HVDC cables. In this paper, polyolefin elastomer (POE) and nano-silica were blended thoroughly and added into a PP mixture by a melting method. Scanning electron microscopy (SEM) was employed to observe the dispersion of POE and nanoparticles. Thermal properties were characterized by differential scanning calorimetry (DSC) and dynamic mechanical analysis (DMA). Mechanical properties were evaluated by tensile tests. The elastomeric properties of composites were improved as the dispersed POE could transfer and homogenize external mechanical forces. DC breakdown results showed that the fail strength of composite with 10 phr POE and 1 phr nano-silica was obviously enhanced. The pulsed electro-acoustic (PEA) results showed that the injection and accumulation of space charge was increased by the introduction of POE, while it was restrained by the collective effect caused by nano-silica filling. X-ray diffraction (XRD) spectrograms showed that secondary ordered structures existed in the composites of PP, POE, and nano-silica, and that the ordered structure around the nanoparticles contributed to the enhancement of breakdown strength. The mechanical and dielectric properties were modified synergistically, which made the modified PP a propitious insulation material for HVDC cables.

Keyword :

PP-based dielectric elastomer blending nano-silica filling dielectric properties mechanical properties

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GB/T 7714 Chi, Xiaohong , Cheng, Lu , Liu, Wenfeng et al. Characterization of Polypropylene Modified by Blending Elastomer and Nano-Silica [J]. | MATERIALS , 2018 , 11 (8) .
MLA Chi, Xiaohong et al. "Characterization of Polypropylene Modified by Blending Elastomer and Nano-Silica" . | MATERIALS 11 . 8 (2018) .
APA Chi, Xiaohong , Cheng, Lu , Liu, Wenfeng , Zhang, Xiaohong , Li, Shengtao . Characterization of Polypropylene Modified by Blending Elastomer and Nano-Silica . | MATERIALS , 2018 , 11 (8) .
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Structure-Dominated Failure of Surge Arresters by Successive Impulses EI SCIE Scopus
期刊论文 | 2017 , 32 (4) , 1907-1914 | IEEE TRANSACTIONS ON POWER DELIVERY | IF: 3.35
WoS CC Cited Count: 5 SCOPUS Cited Count: 3
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This paper investigates the influence of structure on the failure of full-scale metal-oxide arresters under successive lightning impulses. Typical structures of arresters are compared by simulation and experiment. With a finite-element model for the electrical-thermal multiple-field analysis, the thermal characteristics of typical structures of full-scale arresters under successive impulses are obtained. It is revealed that the filled solid insulation can contribute to more radial heat dissipation than filled gas. Experimentally, two full-scale arresters with different structures were exposed to successive nominal lightning impulses until failure, and it is found that the impulse failures of arresters are dominated by the structure and component. Surface flashover is the most common destruction for the varistor column. The cylinder type of varistors is suggested rather than hollow type, and the sleeve for position constraint of the cylinder varistor column should not be organic in order to avoid carbonization by arc discharge. It is found that the metallic spacers can contribute to sprayed-electrode protection, arc extinction, and heat dissipation. Based on the aforementioned results, an advanced arrester with structure optimization is proposed.

Keyword :

failure analysis Surge protection arresters structure impulse

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GB/T 7714 He, Jinqiang , Lin, Jiajun , Liu, Wenfeng et al. Structure-Dominated Failure of Surge Arresters by Successive Impulses [J]. | IEEE TRANSACTIONS ON POWER DELIVERY , 2017 , 32 (4) : 1907-1914 .
MLA He, Jinqiang et al. "Structure-Dominated Failure of Surge Arresters by Successive Impulses" . | IEEE TRANSACTIONS ON POWER DELIVERY 32 . 4 (2017) : 1907-1914 .
APA He, Jinqiang , Lin, Jiajun , Liu, Wenfeng , Wang, Hui , Liao, Yongli , Li, Shengtao . Structure-Dominated Failure of Surge Arresters by Successive Impulses . | IEEE TRANSACTIONS ON POWER DELIVERY , 2017 , 32 (4) , 1907-1914 .
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Large piezoelectric performance of Sn doped BaTiO3 ceramics deviating from quadruple point EI SCIE Scopus
期刊论文 | 2017 , 712 , 1-6 | JOURNAL OF ALLOYS AND COMPOUNDS | IF: 3.779
WoS CC Cited Count: 23 SCOPUS Cited Count: 23
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Abstract :

The piezoelectric performance, both weak-signal piezoelectric coefficient d(33) or large-field electrostrain, were systemically measured from room temperature until their Curie temperature. Large piezoelectric coefficient d(33) of 920 pC/N was found on the boundary between the tetragonal (T) and the orthorhombic (O) phase (around 50 degrees C) rather than the quadruple point with lowest free energy barrier. Further simulation work based on the Landau free energy function also supported the experimental results, owing to the joint effect of the anisotropy energy and the order parameter polarization. Besides, the electrostrain of 0.15% with small hysteresis was also found on the O-T boundary. Systemically study pointed out that polarization rotation would have a significant contribution to the overall piezoelectric response. (C) 2017 Elsevier B.V. All rights reserved.

Keyword :

MPB Ceramics Lead-free Ferroelectric Piezoelectric

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GB/T 7714 Liu, Wenfeng , Wang, Jiageng , Ke, Xiaoqin et al. Large piezoelectric performance of Sn doped BaTiO3 ceramics deviating from quadruple point [J]. | JOURNAL OF ALLOYS AND COMPOUNDS , 2017 , 712 : 1-6 .
MLA Liu, Wenfeng et al. "Large piezoelectric performance of Sn doped BaTiO3 ceramics deviating from quadruple point" . | JOURNAL OF ALLOYS AND COMPOUNDS 712 (2017) : 1-6 .
APA Liu, Wenfeng , Wang, Jiageng , Ke, Xiaoqin , Li, Shengtao . Large piezoelectric performance of Sn doped BaTiO3 ceramics deviating from quadruple point . | JOURNAL OF ALLOYS AND COMPOUNDS , 2017 , 712 , 1-6 .
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Design Optimization of Power Capacitor Major Insulation based on Partial Discharge Performance EI CPCI-S Scopus
会议论文 | 2016 , 282-286 | International Conference on Condition Monitoring and Diagnosis (CMD)
WoS CC Cited Count: 5 SCOPUS Cited Count: 5
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Breakdown of power capacitor major insulation is one of the most severe reasons causing capacitor failure, even explosions. Long term operation in partial discharge (PD) environment can result in accelerated degradation of major insulation, and lead to breakdown ultimately. In this paper, partial discharge performance between terminal and container of a power capacitor was studied, and a typical PD model was employed to analyze different insulation designs. Based on the results, the relationship between different major insulation designs and partial discharge performance was discussed, and an optimized major insulation design was provided, which can contribute to the improvement of capacitor reliability in the future.

Keyword :

partial discharge major insulation power capacitor insulation design

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GB/T 7714 Cheng Lu , Li Zhou , Liu Wenfeng . Design Optimization of Power Capacitor Major Insulation based on Partial Discharge Performance [C] . 2016 : 282-286 .
MLA Cheng Lu et al. "Design Optimization of Power Capacitor Major Insulation based on Partial Discharge Performance" . (2016) : 282-286 .
APA Cheng Lu , Li Zhou , Liu Wenfeng . Design Optimization of Power Capacitor Major Insulation based on Partial Discharge Performance . (2016) : 282-286 .
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