High Breakdown Field CaCu3Ti4O12 Ceramics: Roles of the Secondary Phase and of Sr Doping

Tang, Zhuang; Wu, Kangning; Huang, Yi; Li, Jianying

doi:10.3390/en10071031

Cited by 18 publications

(4 citation statements)

References 27 publications

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“…Relative Permittivity (−) Young's Modulus (GPa) Breakdown Strength (V/µm) Electrical Conductivity (S/cm) BaTiO 3 6000 [3] 67 [23] 2-24 1 [24-26] 1-2.5 × 10 −9 [27,28] CCTO 10,000-100,000 [12,29] 256 [30] 0.05-0.2 1 [31][32][33] 5 × 10 −8 2…”

Section: Fillermentioning

confidence: 99%

Effects of Ferroelectric Fillers on Composite Dielectric Elastomer Actuator

et al. 2021

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Integrating nano- to micro-sized dielectric fillers to elastomer matrices to form dielectric composites is one of the commonly utilized methods to improve the performance of dielectric elastomer actuators (DEAs). Barium titanate (BaTiO3) is among the widely used ferroelectric fillers for this purpose; however, calcium copper titanate CaCu3Ti4O12 (CCTO) has the potential to outperform such conventional fillers. Despite their promising performance, CCTO-based dielectric composites for DEA application are studied to a relatively lower degree. Particularly, the composites are characterized for a comparably small particle loading range, while critical DEA properties such as breakdown strength and nonlinear elasticity are barely addressed in the literature. Thus, in this study, CCTO was paired with polydimethylsiloxane (CH3)3SiO[Si(CH3)2O]nSi(CH3)3 (PDMS), Sylgard 184, to gain a comprehensive understanding of the effects of particle loading and size on the dielectric composite properties important for DEA applications. The dielectric composites’ performance was described through the figures of merit (FOMs) that consider materials’ Young’s modulus, dielectric permittivity, and breakdown strength. The optimum amounts of the ferroelectric filler were determined through the FOMs to maximize composite DEA performance. Lastly, electromechanical testing of the pre-stretched CCTO-composite DEA validated the improved performance over the plain elastomer DEA, with deviations from prediction attributed to the studied composites’ nonlinearity.

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Section: Fillermentioning

confidence: 99%

Effects of Ferroelectric Fillers on Composite Dielectric Elastomer Actuator

et al. 2021

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“…Peak 1 is generally considered as grain boundary relaxation and peak 2 is considered for grain/bulk relaxation in polycrystalline ceramics. [ 52 ] It is also noticed that the peaks are shifted toward the high‐frequency region with increasing temperatures. At the frequency below the loss peak maxima, the charge carriers move over a long distance due to higher relaxation time.…”

Section: Resultsmentioning

confidence: 95%

Microstructure Analysis, Optical, and Electrical Transport Properties of NiAl₂O₄/Al₂O₃ Nanocomposite Powder

Dhara

Sain

Ray

et al. 2022

Physica Status Solidi (a)

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The microstructure characterization, optical properties, electrical transport, and dielectric properties of the thermally stable NiAl2O4/Al2O3 nanocomposite powder sample synthesized by the mechanochemical‐assisted solid‐state reaction from the equimolar mixture of NiO and Al2O3 powders are reported. Rietveld refinement, selected‐area electron diffraction pattern, and Fourier‐transform infrared spectrum analyses confirm the formation of a NiAl2O4 spinel phase with a minor Al2O3 phase in the as‐synthesized powder. Transmission electron microscope images reveal the particle size of the powder sample, ≈26 nm. Raman spectrum reveals the presence of NiAl2O4 normal spinel as a major phase in the sample. The temperature and frequency dependence of the dielectric constants of the NiAl2O4/Al2O3 nanocomposite are explained by Koop's phenomenological theory. The electric modulus approach is used to analyze the electrical transport and dielectric relaxation of NiAl2O4/Al2O3 at different temperatures. The electric modulus plot with elevated temperature shows a dielectric loss peak and reflects interesting information on the grains and grain boundaries of the material with varying temperatures.

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“…[165] Tang et al reported a high breakdown field exceeding 20 kV/cm in Sr-doped CCTO by forming a secondary phase. [17,254] This result also indicates that the incorporation of a secondary phase to control the grain size and grain boundary barrier is feasible. The secondary phase can act as a block between CCTO grains, which can be confirmed in CCTO SrTiO3, CCTO CaTiO3, and CCTO Y2/3Cu3Ti4O12 composites.…”

Section: S1 Varistorsmentioning

confidence: 85%

Colossal Permittivity Materials as Superior Dielectrics for Diverse Applications

Wang

Jie

Yang

et al. 2019

Adv Funct Materials

138

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Ever since the beginning of this century, many kinds of materials have been reported to demonstrate colossal permittivity (CP) or colossal dielectric constant exceeding 10 3 . Accordingly, such CP materials and their further modification and improvement to achieve enhanced CP performance for promising applications in modern electronics, sensors, energy storage, and multifunctional devices and so on have attracted extensive attention. In this review, 2 a general overview of the recent advances in CP materials is provided, ranging from their various categories, physical mechanisms, and modulation methods to promising applications.First, various classes of CP materials are categorized in terms of their structures and dielectric properties. Subsequently, this review provides an insight into the CP mechanisms in views of barrier layer capacitance, defect-dipole cluster and polaronic effect. Moreover, the strategies and prototypical works are introduced in some aspects, including the manipulation of CP properties by doping, percolative capacitors and the methods employed to enhance the dielectric behaviors in CP materials with different forms. We then discuss a wide range of applications based on CP materials, such as modern electronics and energy storage. Finally, the challenges and opportunities for further investigation of CP materials are highlighted in the summary and future perspectives.

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High Breakdown Field CaCu3Ti4O12 Ceramics: Roles of the Secondary Phase and of Sr Doping

Cited by 18 publications

References 27 publications

Effects of Ferroelectric Fillers on Composite Dielectric Elastomer Actuator

Effects of Ferroelectric Fillers on Composite Dielectric Elastomer Actuator

Microstructure Analysis, Optical, and Electrical Transport Properties of NiAl₂O₄/Al₂O₃ Nanocomposite Powder

Colossal Permittivity Materials as Superior Dielectrics for Diverse Applications

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High Breakdown Field CaCu3Ti4O12 Ceramics: Roles of the Secondary Phase and of Sr Doping

Cited by 18 publications

References 27 publications

Effects of Ferroelectric Fillers on Composite Dielectric Elastomer Actuator

Effects of Ferroelectric Fillers on Composite Dielectric Elastomer Actuator

Microstructure Analysis, Optical, and Electrical Transport Properties of NiAl2O4/Al2O3 Nanocomposite Powder

Colossal Permittivity Materials as Superior Dielectrics for Diverse Applications

Contact Info

Product

Resources

About

Microstructure Analysis, Optical, and Electrical Transport Properties of NiAl₂O₄/Al₂O₃ Nanocomposite Powder