Superstructures and band gaps of bismuth tantalum oxide solid solutions


  • The author expresses his thanks to the Fudan University for financial support, to Prof. J. M. Thomas and Dr. D. A. Jefferson for very helpful discussions and to Dr. I. Gameson for assistance in the preparation of the manuscript.


The search for superconductors, catalysts, and semiconductors can be facilitated by an understanding of the relationship between the structure of a material and its properties. In this study, high-resolution electron microscopy (HREM) is used to examine the structures of solid solutions of BiTaO materials including Aurivillius phases, and it is shown that the band gaps of the materials depend on the superstructure rather than on composition.