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Issue 34, 2018
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Improved breakdown strength and energy storage density of a Ce doped strontium titanate core by silica shell coating

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Abstract

For single phase dielectric ceramics prepared using a traditional solid state method, the conflict between high dielectric permittivity and low breakdown strength has always limited the improvement of energy storage density. Here, we design a core–shell structure of Sr0.985Ce0.01TiO3 (SCT)@x wt% SiO2 combining a high dielectric permittivity core with an insulating shell material. The sample of x = 3 wt% sintered at 1300 °C has the largest energy storage density ∼2.23 J cm−3. The effects that different amounts of SiO2 have on phase, microstructure, dielectric and energy storage properties were investigated using X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy with energy dispersive X-ray spectrum (SEM-EDS) and dielectric measurements. As verified by finite element simulations, the energy storage properties are mainly governed by the electric field distribution owing to the introduction of a high dielectric permittivity core (SCT) in a low permittivity shell. The shell material provides an electrical shielding effect around the core, resulting in significant reduction in the field strength within the core material. A comparison of experimental and simulated results is also shown, which is in good agreement with the breakdown properties.

Graphical abstract: Improved breakdown strength and energy storage density of a Ce doped strontium titanate core by silica shell coating

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Publication details

The article was received on 29 Jun 2018, accepted on 24 Jul 2018 and first published on 27 Jul 2018


Article type: Paper
DOI: 10.1039/C8TC03181A
J. Mater. Chem. C, 2018,6, 9130-9139

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    Improved breakdown strength and energy storage density of a Ce doped strontium titanate core by silica shell coating

    J. Qi, M. Cao, J. P. Heath, J. S. Dean, H. Hao, Z. Yao, Z. Yu and H. Liu, J. Mater. Chem. C, 2018, 6, 9130
    DOI: 10.1039/C8TC03181A

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