Improvement in structural, dielectric and energy-storage properties of lead-free niobate glass-ceramic with Sm₂O₃

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• 作者：Yi Zhou^a ; ^{zhouyi478w@163.com" class="auth_mail" title="E-mail the corresponding author} ; Yan Qiao^b ; Yuming Tian^a ; Kaiyue Wang^a ; Guomin Li^a ; Yuesheng Chai^a
• 关键词：Microstructure ; Dielectric properties ; Breakdown strength ; Energy density ; Glass-ceramic
• 刊名：Journal of the European Ceramic Society
• 出版年：2017
• 出版时间：March 2017
• 年：2017
• 卷：37
• 期：3
• 页码：995-999
• 全文大小：1796 K

文摘

Phase evolution, microstructure, dielectric performance, polarization, breakdown strength as well as energy-storage behaviors for the lead-free niobates glass-ceramics with Sm₂O₃ were systematically investigated. Two crystallographic structures of tetragonal tungsten bronze and orthorhombic perovskite complex phases were obtained and Sm³⁺ entered into the crystalline phases. The optimal microstructure of the glass-ceramic was obtained with Sm₂O₃ of 2 mol%. Both dielectric constant and polarizability were enhanced with increasing Sm₂O₃. The breakdown strength and energy-storage behaviors of the glass-ceramics were also improved by increased Sm₂O₃. The highest breakdown field of 21.2 kV/mm, the highest charged (0.74 J/cm³) and discharged energy density (0.45 J/cm³) were obtained in the glass-ceramic with 2 mol% Sm₂O₃. It is due to the reduced interfacial polarization in this particular composition.