High temperature and high energy density dielectric materials

Randall, Clive A.; Ogihara, Hideki; Kim, Jeong-Ryeol; Yang, Ge; Stringer, Craig; Trolier-McKinstry, Susan; Lanagan, Mike

doi:10.1109/ppc.2009.5386292

Cited by 44 publications

(35 citation statements)

References 8 publications

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“…Nevertheless, this image clearly revealed a well-ordered lamellar structure corresponding to the layer-bylayer assembly. We also note that the interface is clean and atomically sharp without interfacial dead layer between (Ti 0.87 O 2 ) n and SrRuO 3 . Such an interface quality realizes the full potential of high-¬ nanosheets.…”

Section: Resultsmentioning

confidence: 67%

High-temperature dielectric responses of molecularly-thin titania nanosheet

Kim

Osada

Dong

et al. 2015

J. Ceram. Soc. Japan

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We have investigated high-temperature dielectric properties of titania nanosheet (Ti 0.87 O 2 ), a new class of high-¬ nanomaterials derived from the exfoliation of layered compounds. In-situ characterizations using atomic force microscopy indicate a robust insulating property in a monolayer form of Ti 0.87 O 2 nanosheets even at 200°C. Furthermore, layer-by-layer assembled nanocapacitors exhibit both size-free high-¾ r characteristic (³120) and high insulation resistance (³10 ¹7 A/cm 2 ) at high temperatures up to 250°C. The simultaneous improvement of ¾ r and thermal stability in high-¬ nanodielectrics is of critical importance for applications of high-temperature capacitors.

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Section: Resultsmentioning

confidence: 67%

High-temperature dielectric responses of molecularly-thin titania nanosheet

Kim

Osada

Dong

et al. 2015

J. Ceram. Soc. Japan

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“…Take various above mentioned analysis results into comprehensive consideration, when x = 10%, the energy storage density and energy efficiency reached 0.797 J/cm 3 and 92.5%, respectively, which were the maximum values in this study. If the single layer thickness was less than 5 μm in capacitors, with refined homogeneous grain and decreased grain size, it was expected to achieve higher energy density (>6 J/cm 3 ) …”

Section: Resultsmentioning

confidence: 99%

Effect of BiNbO₄ doping on the dielectric properties of BaTiO₃ ceramics

Wei

Zhang

et al. 2017

Int J Applied Ceramic Tech

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In this paper, the effect of BiNbO 4 doping on the structural characteristics and dielectric properties were investigated systematically. With the increase in the BiNbO 4 content, a systematic structural characteristics change from ferroelectric tetragonal to cubic phase. Dielectric properties changed from classical ferroelectric behavior to dispersive relaxor-like behavior, further to linear behavior. Because of the created defect dipoles, the long-range dipolar interaction was interrupted and the weak couplings were formed. Energy storage density reached the maximum of 0.797 J/cm 3 with energy efficiency of 92.5% in 0.9BT-0.1BN. The nonlinearity was suppressed obviously, which could enhance the energy storage density in lead-free relaxor materials.capacitors, co-doping, dielectric properties, energy density, nonlinearity | INTRODUCTIONThe pulse power capacitors were used in many applications, such as laser weapons, high-power microwave systems and other power systems, 1-6 which needed to release all the stored energy in microseconds. High permittivity and high breakdown strength (BDS) were the key problems of enhancing the energy density. The BaTiO 3 -based ceramics had been studied for decades in the pulsed-power capacitors applications. was well known as the high permittivity-and temperaturestability. Nb was used to adjust the Curie temperature near the room temperature. Besides, BiNbO 4 was a good microwave dielectric material with low dielectric loss. 20,21 However, few people study the mechanism of simultaneous increase in dielectric constant and linearity.As we all know, larger polarization, smaller P r , relative low nonlinearity, higher energy efficiency, and higher BDS were the determining factors in lead-free relaxor materials for the energy storage applications. However, few paid attention to the dielectric properties beyond the solid solubility. In this paper, the properties of BaTiO 3 with Bi 2 O 3 and Nb 2 O 5 co-doped in a wide range were investigated systematically. The idea was to form weakly coupled relaxor polarization and adjust the Curie temperature with Bi 2 O 3 -Nb 2 O 5 co-doped for reducing the P r.9-11,13-15 And beyond the solid solubility, the formed second phase led to suppress the nonlinearity for improving the energy density. The mechanisms of maintaining high permittivity and suppressing the nonlinearity were investigated systematically.

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“…For instance, the weakly coupled relaxor behavior of 0.7 BaTiO 3 ‐0.3 BiScO 3 ceramics results in an energy density of approximately 6.1 J/cm 3 in a field of 730 kV/cm . The C0G‐type linear dielectric 0.8 CaZrO 3 ‐0.2 CaTiO 3 ceramics have shown energy densities of up to 5 J/cm 3 and breakdown strengths of 650‐1750 kV/cm. Mn‐doped 0.8 CaTiO 3 ‐0.2 CaHfO 3 ceramics display a higher energy density of 9.5 J/cm 3 .…”

Section: Introductionmentioning

confidence: 99%

Chemical composition and temperature dependence of the energy storage properties of Ba_1‐_xSr_xTiO₃ ferroelectrics

et al. 2018

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Dielectric materials with high power and energy densities are desirable for potential applications in advanced pulsed capacitors. Computational material designs based on first‐principles calculations provide a “bottom‐up” method to design novel materials. Here, we present a first‐principles effective Hamiltonian simulation of perovskite ferroelectrics, Ba1‐xSrxTiO3, for energy storage applications. The effects of different chemical compositions, temperatures, and external electric fields on the ferroelectric hysteresis and energy storage density of Ba1‐xSrxTiO3 were investigated. The Curie temperature was tuned from 400 to 100 K by doping Sr in the BaTiO3 lattice. At a constant temperature, the ferroelectric hysteresis became slimmer as the Sr content increased, and the energy storage efficiency increased. For the same chemical composition, the energy storage density increased as the temperature increased. For the composition x = 0.4, a discharged energy density of ~2.8 J/cm3 with a 95% efficiency was obtained in an external electric field of 350 kV/cm, and a discharged energy density of 30 J/cm3 with a 92% efficiency was obtained in an external electric field of 2750 kV/cm. The energy storage property predictions and new material designs have potential to create experimental and industrial products with higher energy storage densities.

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High temperature and high energy density dielectric materials

Cited by 44 publications

References 8 publications

High-temperature dielectric responses of molecularly-thin titania nanosheet

High-temperature dielectric responses of molecularly-thin titania nanosheet

Effect of BiNbO₄ doping on the dielectric properties of BaTiO₃ ceramics

Chemical composition and temperature dependence of the energy storage properties of Ba_1‐_xSr_xTiO₃ ferroelectrics

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High temperature and high energy density dielectric materials

Cited by 44 publications

References 8 publications

High-temperature dielectric responses of molecularly-thin titania nanosheet

High-temperature dielectric responses of molecularly-thin titania nanosheet

Effect of BiNbO4 doping on the dielectric properties of BaTiO3 ceramics

Chemical composition and temperature dependence of the energy storage properties of Ba1‐xSrxTiO3 ferroelectrics

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Effect of BiNbO₄ doping on the dielectric properties of BaTiO₃ ceramics

Chemical composition and temperature dependence of the energy storage properties of Ba_1‐_xSr_xTiO₃ ferroelectrics