Tuning Sodium Ion Conductivity in the Layered Honeycomb Oxide Na3-xSn2-xSbxNaO6

Rebecca W. Smaha, John H. Roudebush, Jake T. Herb, Elizabeth M. Seibel, Jason W. Krizan, Gary M. Fox, Qingzhen Huang, Craig B. Arnold, Robert Joseph Cava

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26 Scopus citations


A series of compounds with the composition Na3-xSn2-xSbxNaO6 (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 α-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 × 10-3 S/cm at 500 °C with suboptimal sample densities). This material may be of interest as a solid Na ion electrolyte. (Figure Presented)

Original languageEnglish (US)
Pages (from-to)7985-7991
Number of pages7
JournalInorganic Chemistry
Issue number16
StatePublished - Aug 17 2015

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry


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