Synthesis and Structures of Reduced Niobates with Four Perovskite-like Layers and Their Semiconducting Properties

W. Sugimoto, H. Ohkawa, M. Naito, Y. Sugahara, K. Kuroda

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Carriers were successfully doped into RbCa2NaNb4O13 by the substitution of Sr2+ for Na+, yielding electroconducting niobates with a layered structure consisting of four perovskite-like layers. Single-phase products of polycrystalline RbCa2Na1-xSrxNb4O13 (x = 0.2 and 0.4) were synthesized by the solid-state reaction of RbCa2Nb3O10, Sr5Nb4O15, Nb2O5, and Nb metal. The solid solutions were indexed based on a tetragonal structure, corresponding to the end-member RbCa2NaNb4O13. With the increase in the amount of strontium substitution, an expansion of the c-axis was observed while the a-axis was essentially constant. The products showed semiconducting properties.

Original languageEnglish
Pages (from-to)508-512
Number of pages5
JournalJournal of Solid State Chemistry
Issue number2
Publication statusPublished - 1999 Dec



  • Electrical conduction
  • Layered perovskite
  • Niobate
  • Reduced oxidation state
  • Rietveld analysis
  • Solid-state reaction

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

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