Improvement of dielectric breakdown strength and energy storage performance in Er2O3–modified 0.95Sr0.7Ba0.3Nb2O6-0.05CaTiO3 lead-free ceramics
Improvement of dielectric breakdown strength and energy storage performance in Er2O3–modified 0.95Sr0.7Ba0.3Nb2O6-0.05CaTiO3 lead-free ceramics
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DOI：
10.1016/j.ceramint.2018.12.031
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发表时间：
2019-04
影响因子：
5.2
通讯作者：
Lei Cao;Ying Yuan;E. Li;Shuren Zhang
中科院分区：
文献类型：
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作者：
Lei Cao;Ying Yuan;E. Li;Shuren Zhang
本研究采用传统固相法制备了0.95 的Sr0.7Ba0.3Nb2O6-0.05CaTiO3-xwt%Er2O3陶瓷(SBNCTEx；x= 0-5)，研究了其微观结构、储能性能以及介电击穿强度与界面极化的关系。与纯0.95Ba0.7Ba0.3Nb2O6-0.05CaTiO_3陶瓷相比，Er2O_3掺杂抑制了 陶瓷的晶粒长大，且具有致密的显微结构。根据能谱分析结果，发现了≥ -1的第二相，并研究了第二相对相对介电击穿强度的影响。介电击穿强度从18.1kV/mm提高到34.4kV/mm，具有良好的储能性能。SBNCTE5陶瓷的储能密度为0.28 J/cm3，储能效率为91.4%。结果表明，SBNCTE陶瓷可以作为储能电容器。
In this study, 0.95 Sr0.7Ba0.3Nb2O6-0.05CaTiO3-xwt% Er2O3ceramics (SBNCTEx;x= 0–5) were synthesized using traditional solid-state method, and we investigated the microstructure, energy storage properties as well as the relationship between dielectric breakdown strength and interfacial polarization. As compared with pure 0.95 Sr0.7Ba0.3Nb2O6-0.05CaTiO3ceramics, the Er2O3dopants suppressed the grain growth of SBNCTEx, and the doped ones showed the dense microstructure. The secondary phase was found forx≥ 1 according to the EDS results, and the influence of the secondary phase on relative dielectric breakdown strength has also been studied. The dielectric breakdown strength increased from 18.1 kV/mm to 34.4 kV/mm, which is good for energy storage. The energy storage density of 0.28 J/cm3and the energy storage efficiency of 91.4% were obtained in the SBNCTE5 ceramics. The results indicate that SBNCTE ceramics can be used as energy storage capacitors.