Effect of K₂O content on breakdown strength and energy-storage density in K₂O-BaO-Nb₂O₅-SiO₂ glass-ceramics

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• 作者：Haitao Wang^a ; Jinhua Liu^a ; ^b ; Jiwei Zhai^a ; ^{apzhai@tongji.edu.cn} ; Bo Shen^a ; Zhongbin Pan^a ; Ke Yang^a ; Jingran Liu^a
• 关键词：Glass-ceramic ; Energy storage density ; Breakdown strength ; Glass network
• 刊名：Ceramics International
• 出版年：2017
• 出版时间：1 April 2017
• 年：2017
• 卷：43
• 期：5
• 页码：4183-4187
• 全文大小：951 K
• 卷排序：43

文摘

Phase evolution, dielectric properties, breakdown strength, and energy-storage performance were studied by varying K2O content in K2O-BaO-Nb2O5-SiO2 glass-ceramics. It was found that dielectric loss with the increase of K2O content increases owing to the un-crystallized K2O into the glass network, while dielectric breakdown strength firstly increases and then decreases due to the competition between two physical mechanisms, i.e., interfacial polarization and bridging-oxygen bond broken by the non-bridging oxygen ions. With the increase of K2O content, energy-storage density firstly increased up to 12.06±0.69 J/cm3 with a high breakdown strength of 1973 kV/cm, and then decreased. Also, the discharged efficiency is obtained as a high value of 92% from P-E hysteresis loops.