Intermediate-temperature conductivity of B-site doped Na_0.5Bi_0.5TiO₃-based lead-free ferroelectric ceramics

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• 作者：Jinqiang Huang^a ; ^b ; Fangyuan Zhu^c ; Da Huang^a ; ^b ; Bing Wang^a ; Tan Xu^a ; Xiangdong Li^a ; Pengyuan Fan^a ; ^b ; Feng Xia^a ; ^b ; Jianzhong Xiao^a ; ^{jzxiao@mail.hust.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Haibo Zhang^a ; ^b ; ^{hbzhang@mail.hust.edu.cn" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Na0.5Bi0.5TiO3 ; MgO doping ; Oxide-ion conductivity ; AC impedance spectroscopy
• 刊名：Ceramics International
• 出版年：2016
• 出版时间：15 November 2016
• 年：2016
• 卷：42
• 期：15
• 页码：16798-16803
• 全文大小：1406 K

文摘

Na_0.5Bi_0.5TiO₃ (NBT) based oxide-ion conductor ceramics have great potential applications in intermediate-temperature solid oxide fuel cells (SOFCs) and oxygen sensors. Na_0.5Bi_0.49Ti_1−xMg_xO_3−δ ceramics with x=0, 0.01, 0.02, 0.03, 0.05 and 0.08 were prepared by conventional solid-state reaction. XRD measurement and SEM analysis revealed the formation of pure perovskite structures without secondary phase. MgO doping greatly decreased the sintering temperature and inhibited grain growth. AC impedance spectroscopy measurement was adopted to measure the total conductivity, which was found to increase with MgO doping content ranging from 0 to 3 mol% and subsequently to decrease. High oxygen ionic conductivity σ_t=0.00629 S/cm was achieved for sample doped with 3 mol% MgO at 600 °C in air atmosphere.