Tuning Sodium Ion Conductivity in the Layered Honeycomb Oxide Na3鈥?i>xSn2鈥?i>xSbxNaO6

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• 作者：Rebecca W. Smaha ; John H. Roudebush ; Jake T. Herb ; Elizabeth M. Seibel ; Jason W. Krizan ; Gary M. Fox ; Qingzhen Huang ; Craig B. Arnold ; Robert J. Cava
• 刊名：Inorganic Chemistry
• 出版年：2015
• 出版时间：August 17, 2015
• 年：2015
• 卷：54
• 期：16
• 页码：7985-7991
• 全文大小：519K
• ISSN：1520-510X

文摘

A series of compounds with the composition Na_3鈥?i>xSn_2鈥?i>xSb_xNaO₆ (x = 0.0, 0.2, 0.4, 0.6, 0.7, 0.8, 0.9, and 1.0) has been prepared by solid-state reaction and characterized by powder X-ray diffraction, neutron diffraction (for x = 0.0), and impedance spectroscopy. The compounds have a layered structure derived from that of 伪-NaFeO₂, with alternating Na₃ planes and NaSn₂O₆ slabs with honeycomb in-plane ordering. The structure of the parent compound, Na₂SnO₃, has been determined as a two-layer honeycomb in monoclinic space group C2/c. Due to charge neutrality requirements, the substitution of Sb⁵⁺ for Sn⁴⁺ creates sodium site vacancies that facilitate high sodium ion mobility. A decrease in layer stacking disorder is also observed. The conductivity increases linearly with x and has a maximum at x = 0.8 (1.43 脳 10^鈥? S/cm at 500 掳C with suboptimal sample densities). This material may be of interest as a solid Na ion electrolyte.