A current-controlled flash sintering processing leading to dense and fine-grained typical multi-element ZnO varistor ceramics

Niu, Jingpeng; She, Haibo; Liu, Zhiyuan; Cheng, Muwen; Xu, Jinghong; Liu, Juan; Chen, Guorong; Tang, Bin; Xu, Dong

doi:10.1016/j.jallcom.2021.160124

Cited by 26 publications

(10 citation statements)

References 38 publications

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“…Under 750 V/cm electric field, SEM of (Mg 1/3 Ta 2/3 ) 0.01 Ti 0.99 O 2 sample on both sides of the electrode is shown in Figure 5. It is easy to see that the grain size of the ceramic sample does not change appreciably on both sides of the electrode, which is in line with earlier findings (Niu et al , 2021). To have a better understanding of the distribution of components in the samples of conventional sintering and two-step flash sintering, EDS diagram is shown in Figure 6.…”

Section: Resultssupporting

confidence: 92%

“…The varistor performance is tested and listed in Table 3. In Table 3, the nonlinear coefficient is inversely associated with the leakage current of ceramic samples, which is in line with the past study findings (Cui et al , 2020; Mei et al , 2020; Niu et al , 2021; Peng et al , 2020). Compared with conventional sintering, FS600 ceramic samples have higher nonlinear coefficients.…”

Section: Resultssupporting

confidence: 91%

“…Flash sintering, proposed by Cologna et al (2010), is a revolutionary sintering technique that may lower the processing temperature by 600°C and shorten the sintering time to a few seconds in 3 mol% Y 2 O 3 stabilized zirconia (3YSZ). Nowadays, this method has been studied by many researchers because of its advantages in shortening sintering time and fast densification and has been applied to many material systems, including 3YSZ (Liu et al, 2016a(Liu et al, , 2016bWei et al, 2017), doped CeO 2 (Li et al, 2019;Mishra et al, 2020), ZnO (Mei et al, 2020;Niu et al, 2021), TiO 2 (Wang et al, 2019a(Wang et al, , 2019b(Wang et al, , 2019cLi et al, 2019), CaCu 3 Ti 4 O 12 (Jakkree et al, 2021;Shan et al, 2013), K 0.5 Na 0.5 NbO 3 (Yan et al, 2021) and so on. To explain the flash sintering phenomenon of ceramics, many types of mechanisms, such as Joule heat effect (Raj, 2012), Frenkel pair effect (Naik et al, 2014) and electrochemical reduction (Liu et al, 2018), have been proposed.…”

Section: Introductionmentioning

confidence: 99%

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Two-step flash sintering of (Mg_1/3Ta_2/3)_0.01Ti_0.99O₂ giant dielectric ceramics

Wang

Peng

Zhong³

et al. 2022

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Purpose The purpose of this paper on the one hand is to reduce the sintering temperature, shorten the sintering time and improve the electrical properties of the sample through the two-step flash sintering method and on the other hand is to study the effect of electric field on the phase structure, microstructure and electrical properties of the flash sintering sample. Design/methodology/approach In this paper, (Mg1/3Ta2/3)0.01Ti0.99O2 giant dielectric ceramics were prepared by conventional sintering and two-step flash sintering, respectively. Further, the effect of electric field (600–750 V/cm) on the electrical properties of (Mg1/3Ta2/3)0.01Ti0.99O2 giant dielectric ceramics was studied. Findings The results show that compared with the conventional sintering, the sintering temperature of the two-step flash sintering can be reduced by 200°C and the sintering time can be shortened by 12 times. All sintered samples were single rutile TiO2 structure. Compared with conventional sintering, two-step flash sintering samples have finer grain size. The two-step flash sintered sample has similar dielectric properties to the conventional sintered sample. The dielectric constant of flash sintered samples decreases with the increase of electric field. When the electric field is 700 V/cm, the ceramic sample has the optimal dielectric properties, where the dielectric constant is approximately 5.5 × 103 and the dielectric loss is about 0.18 at 1 kHz. Impedance spectroscopy analysis shows that the excellent dielectric properties are attributed to the internal barrier layer capacitance model. Originality/value This paper not only provides a new method for the preparation of co-doped TiO2 giant dielectric ceramics but also has great potential in greatly improving efficiency and saving energy.

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Section: Resultssupporting

confidence: 92%

Section: Resultssupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

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Two-step flash sintering of (Mg_1/3Ta_2/3)_0.01Ti_0.99O₂ giant dielectric ceramics

Wang

Peng

Zhong³

et al. 2022

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“…Figure 4b also reveals that another important body of work in FS is dedicated to the sintering of materials with technological interest, which development is being hampered by the high temperatures required or other kinds of difficulties in their processing such as the volatilization of some of their components. That is the case of different sodium and lithium ion conductive ceramics for solid-state batteries [67,107], the lead-free piezoelectric ceramic potassium sodium niobate [70,73], or ZnO-Bi 2 O 3 -based varistor ceramics [108][109][110]. We expect that this trend will probably be maintained during the next few years.…”

Section: Document-level Analysis Influential Documents and Trending T...mentioning

confidence: 98%

Flash Sintering Research Perspective: A Bibliometric Analysis

2022

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Flash Sintering (FS), a relatively new Field-Assisted Sintering Technique (FAST) for ceramic processing, was proposed for the first time in 2010 by Prof. Rishi Raj’s group from the University of Colorado at Boulder. It quickly grabbed the attention of the scientific community and since then, the field has rapidly evolved, constituting a true milestone in materials processing with the number of publications growing year by year. Moreover, nowadays, there is already a scientific community devoted to FS. In this work, a general picture of the scientific landscape of FS is drawn by bibliometric analysis. The target sources, the most relevant documents, hot and trending topics as well as the social networking of FS are unveiled. A separate bibliometric analysis is also provided for Reaction or Reactive Flash Sintering (RFS), where not only the sintering, but also the synthesis is merged into a single step. To the best of our knowledge, this is the first study of this nature carried out in this field of research and it can constitute a useful tool for researchers to be quickly updated with FS as well as to strategize future research and publishing approaches.

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“…The ZnO-based varistor is the leading electro-ceramic semiconductor which is one of the key components of different electric power systems and electronic circuits(Roy et al , 2021; Niu et al , 2021). As a fact, this device plays a vital role to protect the various circuits and systems from voltage surges (Meng et al , 2016).…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of ZnO based varistor ceramics: effect of sintering temperatures

Bouchekhlal¹,

Boulesbaa

2022

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Purpose The purpose of this paper is to investigate the effects of the sintering temperature on the microstructural, morphological and electrical characteristics of Zinc oxide (ZnO)-based varistors. Design/methodology/approach This study used a conventional method to design and produce ZnO varistors by sintering ZnO powder with small amounts of various metal oxides. Furthermore, the effect of sintering temperature on varistor properties of (Bi, Co, Cr, Sb, Mn)-doped ZnO ceramics was investigated in the range of 1280–1350 °C. Findings The obtained results showed an EB value of 2109.79 V/cm, a Vgb value of 0.831 V and a nonlinear coefficient (α) value of 19.91 for sample sintered at temperature of 1300 °C. In addition, the low value of tan δ at low frequency range confirmed that the grain boundaries created in 1300 °C sintering temperature were obviously good. Originality/value Based on the previous research on the ZnO-based varistors, a thorough study was carried out on these components to improve their electrical characteristics. Thus, it is necessary that those varistors have low leakage current and low value of dissipation factor to ensure their good quality. High breakdown fields and nonlinearity coefficients are also required in such kind of components. The effect of sintering temperature on the varistor properties of the new compositions (zinc, bismuth, manganese, chrome, cobalt, antimony and silicon oxides)-doped ZnO ceramics was studied in the range of 1280–1350 °C. Also, the microstructure and the phase evolution of the samples sintered at various temperatures (1280 °C, 1300 °C, 1320 °C and 1350 °C) were investigated according to X-ray diffraction and scanning electron microscope measurements.

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A current-controlled flash sintering processing leading to dense and fine-grained typical multi-element ZnO varistor ceramics

Cited by 26 publications

References 38 publications

Two-step flash sintering of (Mg_1/3Ta_2/3)_0.01Ti_0.99O₂ giant dielectric ceramics

Two-step flash sintering of (Mg_1/3Ta_2/3)_0.01Ti_0.99O₂ giant dielectric ceramics

Flash Sintering Research Perspective: A Bibliometric Analysis

Synthesis and characterization of ZnO based varistor ceramics: effect of sintering temperatures

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A current-controlled flash sintering processing leading to dense and fine-grained typical multi-element ZnO varistor ceramics

Cited by 26 publications

References 38 publications

Two-step flash sintering of (Mg1/3Ta2/3)0.01Ti0.99O2 giant dielectric ceramics

Two-step flash sintering of (Mg1/3Ta2/3)0.01Ti0.99O2 giant dielectric ceramics

Flash Sintering Research Perspective: A Bibliometric Analysis

Synthesis and characterization of ZnO based varistor ceramics: effect of sintering temperatures

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Product

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Two-step flash sintering of (Mg_1/3Ta_2/3)_0.01Ti_0.99O₂ giant dielectric ceramics

Two-step flash sintering of (Mg_1/3Ta_2/3)_0.01Ti_0.99O₂ giant dielectric ceramics