Effect of HfO₂ addition as intergranular grains on the energy storage behavior of Ca_0.6Sr_0.4TiO₃ ceramics

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• 作者：Lin Zhang ; Hua Hao ; Hanxing Liu ; ^{lhxhp@whut.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Zhe Song ; Zhonghua Yao ; Juan Xie ; Haixia Liu ; Xinyi Zhu ; Qi Xu ; Xuechen Huang ; Minghe Cao
• 关键词：Linear CST ; Intergranular grains ; Breakdown strength ; Energy storage efficiency ; Interfacial polarization
• 刊名：Journal of the European Ceramic Society
• 出版年：2016
• 出版时间：October 2016
• 年：2016
• 卷：36
• 期：13
• 页码：3157-3163
• 全文大小：2239 K

文摘

Pore free Ca_0.6Sr_0.4TiO₃ (CST) ceramics with HfO₂ additives (0 wt.%, 2.0 wt.%, 4.0 wt.% and 6.0 wt.%) were fabricated via solid state reaction method at 1400 °C. Structure characterization was conducted by XRD and SEM, indicating the existence of HfO₂ at grain boundaries as the intergranular phase. The dielectric breakdown strength and energy storage efficiency were found to be greatly enhanced for CST with moderate HfO₂ additives, the sample with 4.0 wt.% HfO₂ exhibited optimized microstructure and energy storage properties, with maximum average breakdown strength (28.9 kV/mm) and high energy storage efficiency (nearly 95% at 24 kV/mm). In addition, effect of Hf-rich intergranular phase on the charge transportation and interfacial polarization behavior was discussed. With good dispersion, the intergranular HfO₂ phase was considered effective to modify the grain boundaries properties and consequently improve the energy storage performance for CST ceramics.