Solid-state synthesis of high performance Na-β″-Al₂O₃ solid electrolyte doped with MgO

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• 作者：Guangyu Chen ; ^{chengya17@126.com" class="auth_mail" title="E-mail the corresponding author} ; ^{Chenguangyu@nint.ac.cn" class="auth_mail" title="E-mail the corresponding author} ; Jiachun Lu ^{Lu_jc@126.com" class="auth_mail" title="E-mail the corresponding author Lujiachun@nint.ac.cn" class="auth_mail" title="E-mail the corresponding author} ; Xiaohua Zhou ^{Zhouxiaohua@nint.ac.cn" class="auth_mail" title="E-mail the corresponding author} ; Lixin Chen ^{Chenlixin@nint.ac.cn" class="auth_mail" title="E-mail the corresponding author} ; Xinbiao Jiang ^{Jiangxinbiao@nint.ac.cn" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Na-β&Prime ; -Al2O3 solid electrolytes ; MgO doping ; Bending strength ; Ionic conductivity
• 刊名：Ceramics International
• 出版年：2016
• 出版时间：1 November 2016
• 年：2016
• 卷：42
• 期：14
• 页码：16055-16062
• 全文大小：2604 K

文摘

The use of a small amount of MgO dopant can help to improve the performance of Na-β″-Al₂O₃ electrolyte by enhancing the relative density, promoting the formation of homogeneous and compact microstructure, and increasing the content of β″-Al₂O₃ phase. In this work, the effects of the amount of MgO dopant and the sintering temperature on the relative density, β″ phase content, and performance of the Na-β″-Al₂O₃ electrolyte were studied in detail, respectively. The samples were characterized in respects of relative density, closed-cell porosity, XRD, SEM, bending strength, and AC Impedance. The results demonstrated that the addition of MgO dopant significantly improved the densification rate of Na-β″-Al₂O₃ ceramics. The crucial temperature phase for pore elimination was 1500–1550 °C. Samples doped with 0.2–2.0 wt% MgO formed homogeneous microstructures associated with grain size refinement of the final compact at 1550 °C. Macro defects appeared when sintering temperature reached to 1580 °C. The total conductivity showed a linear dependence on the temperature (200–700 °C), which fitted well with the Arrhenius equation. Na-β″-Al₂O₃ ceramics doped with 0.4 wt% MgO showed the best bending strength (283 MPa) and preferable ionic conductivity.