Structure and dielectric properties of MgO-coated BaTiO3 ceramics

Lai, Xinmin; Hao, Hua; Liu, Zhen; Li, Shangshu; Liu, Yiren; Emmanuel, Marwa; Yao, Zhonghua; Cao, Minghe; Wang, Dawei; Liu, Hanxing

doi:10.1007/s10854-020-03430-7

Cited by 13 publications

(6 citation statements)

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“…Different sintering technologies, such as spark plasma sintering (SPS), two-step sintering, and the formation of coatings using chemical methods, − have also been shown to improve density and give rise to higher BDS and W rec .…”

Section: Principles Of Energy Storage In Electroceramicsmentioning

confidence: 99%

“…BT-based dielectric ceramics have been studied for decades and dominate the commercial market of ceramic capacitors. , Several studies have reported improvements in energy storage performance of BT-based ceramics through (i) substituting oxides to improve BDS, such as Al 2 O 3 , La 2 O 3 , MgO, SiO 2 ; ,,− (ii) employing different sintering techniques, such as SPS, citrate precursor, and cold sintering (CS) to increase ceramic density or control grain growth; ,, (iii) adding sintering aids such as ZnNb 2 O 6 and NiNb 2 O 6 to increase density; , (iv) introducing further end-members in the solid solution, Bi(Mg 1/2 Ti 1/2 )O 3 , , BiYbO 3 , BMN, − NBT–Na 0.73 Bi 0.09 NbO 3 , Nd(Zn 1/2 Ti 1/2 )O 3 , Bi(Zn 2/3 Nb 1/3 )O 3 , Bi(Li 1/2 Nb 1/2 )O 3 , , Bi(Zn 1/2 Zr 1/2 )O 3 , Bi(Zn 1/2 Ti 1/2 )O 3 , YNbO 4 , Bi 0.9 Na 0.1 In 0.8 Zr 0.2 O 3 , Bi(Li 1/2 Ta 1/2 )O 3 , Bi(M g 1/2 Zr 1/2 )O 3 , Bi(Zn 1/2 Sn 1/2 )O 3 , K 0.5 Bi 0.5 TiO 3 –KNbO 3 , and K 0.5 Bi 0.5 TiO 3 –NN to promote RFE behavior. The energy storage properties of BT-based materials are summarized in Table .…”

Section: State-of-the-art In Electroceramics For Energy Storagementioning

confidence: 99%

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Electroceramics for High-Energy Density Capacitors: Current Status and Future Perspectives

et al. 2021

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Materials exhibiting high energy/power density are currently needed to meet the growing demand of portable electronics, electric vehicles and large-scale energy storage devices. The highest energy densities are achieved for fuel cells, batteries, and supercapacitors, but conventional dielectric capacitors are receiving increased attention for pulsed power applications due to their high power density and their fast charge–discharge speed. The key to high energy density in dielectric capacitors is a large maximum but small remanent (zero in the case of linear dielectrics) polarization and a high electric breakdown strength. Polymer dielectric capacitors offer high power/energy density for applications at room temperature, but above 100 °C they are unreliable and suffer from dielectric breakdown. For high-temperature applications, therefore, dielectric ceramics are the only feasible alternative. Lead-based ceramics such as La-doped lead zirconate titanate exhibit good energy storage properties, but their toxicity raises concern over their use in consumer applications, where capacitors are exclusively lead free. Lead-free compositions with superior power density are thus required. In this paper, we introduce the fundamental principles of energy storage in dielectrics. We discuss key factors to improve energy storage properties such as the control of local structure, phase assemblage, dielectric layer thickness, microstructure, conductivity, and electrical homogeneity through the choice of base systems, dopants, and alloying additions, followed by a comprehensive review of the state-of-the-art. Finally, we comment on the future requirements for new materials in high power/energy density capacitor applications.

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Section: Principles Of Energy Storage In Electroceramicsmentioning

confidence: 99%

Section: State-of-the-art In Electroceramics For Energy Storagementioning

confidence: 99%

Electroceramics for High-Energy Density Capacitors: Current Status and Future Perspectives

et al. 2021

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“…However, the dielectric loss tangent (tanδ) of most giant dielectric oxides is still huge (>>0.1), which is not required for use in MLCCs. Thus, the importance of developing MLCCs with good temperature stability and electroceramics for high energy density capacitors has been widely reported [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Origins of Giant Dielectric Properties with Low Loss Tangent in Rutile (Mg1/3Ta2/3)0.01Ti0.99O2 Ceramic

et al. 2021

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The Mg2+/Ta5+ codoped rutile TiO2 ceramic with a nominal composition (Mg1/3Ta2/3)0.01Ti0.99O2 was synthesized using a conventional solid-state reaction method and sintered at 1400 °C for 2 h. The pure phase of the rutile TiO2 structure with a highly dense microstructure was obtained. A high dielectric permittivity (2.9 × 104 at 103 Hz) with a low loss tangent (<0.025) was achieved in the as-sintered ceramic. After removing the outer surface, the dielectric permittivity of the polished ceramic increased from 2.9 × 104 to 6.0 × 104, while the loss tangent also increased (~0.11). The dielectric permittivity and loss tangent could be recovered to the initial value of the as-sintered ceramic by annealing the polished ceramic in air. Notably, in the temperature range of −60–200 °C, the dielectric permittivity (103 Hz) of the annealed ceramic was slightly dependent (<±4.4%), while the loss tangent was very low (0.015–0.036). The giant dielectric properties were likely contributed by the insulating grain boundaries and insulative surface layer effects.

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“…The microstructure of BST@Fe 2 O 3 ceramics displayed a relatively uniform grain size, but poor density was clear, as shown in Figure 9. In general, a big gap would generate between rhombic-type grains [23][24][25][26][27], which would lead to the migration of grain boundary being more difficult, followed by the appetence of pores in the ceramics. Besides that, Fe 2 O 3 coated on the surface of BST would inhibit the migration of grain boundary in the processing of sintering, thus leading to reduced grain size and density [28].…”

Section: Bst@fe 2 O 3 Composite Ceramics: Microstructurementioning

confidence: 99%

“…Besides that, Fe2O3 coated on the surface of BST would inhibit the migration of grain boundary in the processing of sintering, thus leading to reduced grain size and density [28]. between rhombic-type grains [23][24][25][26][27], which would lead to the migration of grain boundary being more difficult, followed by the appetence of pores in the ceramics. Besides that, Fe2O3 coated on the surface of BST would inhibit the migration of grain boundary in the processing of sintering, thus leading to reduced grain size and density [28].…”

Section: Bst@fe 2 O 3 Ceramics: Dielectric Propertiesmentioning

confidence: 99%

Core-Shell Structure and Dielectric Properties of Ba0.6Sr0.4TiO3@ Fe2O3 Ceramics Prepared by Co-Precipitation Method

Wang

et al. 2021

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Ba0.6Sr0.4TiO3 (BST) ceramic materials have been widely used in the field of multilayer ceramic capacitors. Surface modification through the surface coating to form a heterogeneous layer could effectively improve the dielectric properties. In this work, BST powders were prepared by a co-precipitation method. The effects of reaction conditions on the microstructure of the BST powder were investigated. The reaction temperatures significantly affected the morphology of BST powder, and the rhombic-type particles were obtained with the reaction temperature around 80 °C. Meanwhile, the BST@Fe2O3 was prepared by the chemical precipitation method using BST powders with rhombic-type microstructure as “core”, and the so-called “core-shell” microstructure was confirmed in the BST@Fe2O3 powder. Then, BST@x wt%Fe2O3 (x = 2.5, 5, 7.5, and 10, denoting the different content of Fe2O3) ceramics were further prepared, and the influence of “core-shell” structure on the phase structure, microstructure, and dielectric properties was investigated. With the increasing of Fe2O3 content, the ferroelectric–paraelectric phase transition temperature shifts toward lower temperatures, and dielectric peaks gradually become broad and frequency-dependent, which may be due to inconsistent chemical composition from core to shell.

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Structure and dielectric properties of MgO-coated BaTiO3 ceramics

Cited by 13 publications

References 30 publications

Electroceramics for High-Energy Density Capacitors: Current Status and Future Perspectives

Electroceramics for High-Energy Density Capacitors: Current Status and Future Perspectives

Origins of Giant Dielectric Properties with Low Loss Tangent in Rutile (Mg1/3Ta2/3)0.01Ti0.99O2 Ceramic

Core-Shell Structure and Dielectric Properties of Ba0.6Sr0.4TiO3@ Fe2O3 Ceramics Prepared by Co-Precipitation Method

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