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The dependence of the conduction band edge of the alkali earth metal bismuthates on their composition

Abstract

We present a comparative analysis of the conduction band edge of the alkali earth metal bismuthates containing Mg, Ca, Sr, and Ba. The conduction band edges were computed using the method suggested by Butler and Ginley. The calculations reveal that they depend on the bismuthate’s composition and vary over a wide range. We demonstrate that the energy of the conduction band increases in the series Ca → Sr → Ba. It also increases with an increase of the alkali earth metal content. The performed calculations help to determine the potential alkali earth metal bismuthate photocatalysts. The most promising compositions found in this study include strontium and barium bismuthates in which the number of the alkali earth metal atoms in the cationic sublattice exceeds the number of the bismuth atoms.

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Acknowledgements

The research was carried out at the expense of a grant from the Russian Science Foundation (Project No. 17-73-00007).

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Correspondence to Dmitry Sergeevich Shtarev.

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Shtarev, D.S., Blokh, A.I., Nashchochin, E.O. et al. The dependence of the conduction band edge of the alkali earth metal bismuthates on their composition. Opt Quant Electron 50, 228 (2018). https://doi.org/10.1007/s11082-018-1498-9

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  • DOI: https://doi.org/10.1007/s11082-018-1498-9

Keywords

  • VLA photocatalysts
  • Alkali earth metal bismuthates
  • Photocatalytic activity
  • Conduction band edge calculation