• Synthesis and structure of some interesting oxides of bismuth

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      https://www.ias.ac.in/article/fulltext/jcsc/096/06/0449-0458

    • Keywords

       

      Bismuth oxides; synthesis; structures; sillenites; Aurivillius (layered perovskite) phases; pyrochlores

    • Abstract

       

      Synthesis and structures of several new oxides containing bismuth are described. Three types of structures are common among the multinary oxides containing trivalent bismuth. They are the sillenite structure of γ-Bi2O3, the layered perovskite structure of Aurivillius phases and the pyrochlore structure. The influence of Bi3+∶6s2 lone pair electrons is seen in all the three structures. In transition metal oxides containing trivalent bismuth,do cations (Ti4+, Nb5+, W6+) stabilize the layered perovskite structure, while cations containing partially-filledd orbitals (V4+, Cr3+, Fe3+) favour pyrochlore-related structures. Ferroelectric distortion ofMO6 octahedra of thedo cations seems to play an important role in stabilizing layered perovskite structures.

    • Author Affiliations

       

      J Gopalakrishnan1

      1. Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore - 560012, India
    • Dates

       
  • Journal of Chemical Sciences | News

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