High breakdown strength and energy storage performance in (Nb, Zn) modified SrTiO3 ceramics via synergy manipulation,Journal of Materials Chemistry C

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High breakdown strength and energy storage performance in (Nb, Zn) modified SrTiO3 ceramics via synergy manipulation
Journal of Materials Chemistry C ( IF 5.7 ) Pub Date : 2019/12/23 , DOI: 10.1039/c9tc06256d
Wengao Pan _{1,

2,

3,

4} , Minghe Cao _{1,

2,

3,

4} , Abdullah Jan _{1,

2,

3,

4} , Hua Hao _{1,

2,

3,

4} , Zhonghua Yao _{1,

2,

3,

4} , Hanxing Liu _{2,

3,

4,

5}

Affiliation

Dielectric capacitors with high energy storage properties are key enablers for potential applications. We report SrTi_0.985(Zn_1/3Nb_2/3)_0.015O₃–x wt%ZnNb₂O₆ ceramics with high breakdown strength and energy storage performance by synergy manipulation. The structures, energy storage and dielectric properties of the ceramics are systematically investigated. Introduction of ZnNb₂O₆ mediates the contradiction between permittivity and breakdown strength. As a result, a high breakdown strength of 422 kV cm⁻¹ and an excellent energy storage density of 2.35 J cm⁻³ are achieved in x = 4.5 ceramics, which also exhibit fast discharge features (τ_0.9 < 1.5 μs), good thermal stability (25–150 °C) and outstanding cyclic characteristics (up to 5 × 10⁵ times). Further results indicate that ZnNb₂O₆ additives partly dissolve into perovskite lattices to promote the formation of superlattice structures, improving the local polarization, and partly disperse around grain boundary regions to inhibit grain growth and relieve the direct damage from a strong electric field to grains, increasing the breakdown strength. This strategy should be generalizable for designing high performance dielectrics and other novel composite materials that benefit from synergistic effect manipulation.

中文翻译：

（Nb，Zn）改性SrTiO3陶瓷通过协同作用具有较高的击穿强度和储能性能

具有高能量存储特性的介电电容器是潜在应用的关键推动力。我们报告了通过协同作用具有高击穿强度和储能性能的SrTi _0.985（Zn _1/3 Nb _2/3）_0.015 O ₃ - x wt％ZnNb ₂ O ₆陶瓷。系统地研究了陶瓷的结构，储能和介电性能。ZnNb ₂ O _6的引入介导介电常数和击穿强度之间的矛盾。结果，具有高的击穿强度为422 kV cm ^-1和出色的储能密度为2.35 J cm^-3中实现X = 4.5的陶瓷，其还表现出快速放电特性（ τ _0.9 <1.5微秒），良好的热稳定性（25-150℃）和出色的循环特性（高达5×10⁵次）。进一步的结果表明ZnNb₂ O₆添加剂部分溶解在钙钛矿晶格中，以促进超晶格结构的形成，改善局部极化，部分分散在晶界区域周围，以抑制晶粒生长，并缓解强电场对晶粒的直接破坏，从而增加击穿强度。对于设计高性能电介质和受益于协同效应操纵的其他新型复合材料，该策略应该是可推广的。

更新日期：2020-02-13

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