Effect of the grain boundary on the dielectric breakdown strength of (Ba&lt;inf&gt;0.4&lt;/inf&gt;Sr&lt;inf&gt;0.6&lt;/inf&gt;)TiO&lt;inf&gt;3&lt;/inf&gt; paraelectric ceramics with various grain sizes

Song, Zhe; Liu, Hanxing; Hao, Hua; Cao, Minghe; Xu, Qing; Yao, Zhonghua; Wang, Zhijian; Hu, Wei; Shi, Yatong; Yu, Zhiyong

doi:10.1109/icept.2014.6918760

Cited by 2 publications

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“…The nominal breakdown strength of the ferroelectric ceramic with a grain size of 50 nm is almost 50% higher than that a grain size of 125 nm. This finding shows good agreement with other experimental results . Within the grain size scale in our simulation, the thickness of the grain boundary is considered as grain size independent, which is widely adopted by other reports …”

Section: Resultssupporting

confidence: 91%

“…Moreover, there have been some mechanism analyses of the size‐dependent dielectric permittivity based on numerical modeling . However, few experimental reports concerning the grain‐size dependence of the dielectric breakdown strength and even fewer mechanistic analyses have been carried out on the size‐dependent dielectric breakdown of ferroelectric ceramics. It has been reported that the dielectric breakdown strength dominates the energy performance in ferroelectric materials compared to the dielectric permittivity, especially under an ultrahigh electric field from the experimental aspect .…”

Section: Introductionmentioning

confidence: 99%

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Grain‐size–dependent dielectric properties in nanograin ferroelectrics

et al. 2018

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A series of ferroelectric ceramic models with grain and grain‐boundary structures of different sizes are established via Voronoi tessellations. A phase‐field model is introduced to study the dielectric breakdown strength of these ferroelectric ceramics. Afterward, the relation between the electric displacement and electric field and the hysteresis loop are calculated using a finite element method based on a classical and modified hyperbolic tangent model. The results indicate that as the grain size decreases, the dielectric strength is enhanced, but the dielectric permittivity is reduced. The discharge energy density and energy storage efficiency of these ferroelectric ceramics extracted from the as‐calculated hysteresis both increase along with a decrease in their grain size at their breakdown points. However, under the same applied electric field, the ferroelectric ceramic with a smaller grain size possesses a lower discharge energy density but a higher energy storage efficiency. The results suggest that ferroelectric ceramics with smaller grain sizes possess advantages for applications in energy storage devices.

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Section: Resultssupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Grain‐size–dependent dielectric properties in nanograin ferroelectrics

et al. 2018

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“…Through joint efforts of researchers in past decades, a great attention has been paid to prepare lead‐free ceramics especially with core‐shell‐structured grains . Grain shells usually possess high breakdown strength and are more difficult to be damaged by the applied electric field than grain cores, which will enhance the breakdown strength of the entire ceramic and lead to high energy‐storage density. Recently, a large recoverable energy‐storage density of 4.03 J/cm 3 with dielectric breakdown strength of 400 kV/cm was reported in 0.85KNN–0.15ST ceramics .…”

Section: Introductionmentioning

confidence: 99%

Multiscale design of high‐voltage multilayer energy‐storage ceramic capacitors

et al. 2017

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Multilayer energy-storage ceramic capacitors (MLESCCs) are studied by multiscale simulation methods. Electric field distribution of a selected area in a MLESCC is simulated at a macroscopic scale to analyze the effect of margin length on the breakdown strength of MLESCC using a finite element method. Phase field model is introduced to analyze the dielectric breakdown mechanism of MLESCC at a mesoscopic scale. The microstructure of selected area is generated through voronoi tessellation random construction routine containing core-shell-structured dielectric materials. The effects of margin length, shell permittivity, and shell volume fraction on the breakdown strength of MLESCC are respectively studied. Results indicate that the breakdown strength of MLESCC can be enhanced by adopting larger margin lengths, or by increasing the shell permittivity or volume fraction. K E Y W O R D Sbreakdown strength, core-shell, finite element method, MLESCC, multiscale design, phase field method

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Effect of the grain boundary on the dielectric breakdown strength of (Ba<inf>0.4</inf>Sr<inf>0.6</inf>)TiO<inf>3</inf> paraelectric ceramics with various grain sizes

Cited by 2 publications

References 0 publications

Grain‐size–dependent dielectric properties in nanograin ferroelectrics

Grain‐size–dependent dielectric properties in nanograin ferroelectrics

Multiscale design of high‐voltage multilayer energy‐storage ceramic capacitors

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