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Optical absorption in solution processed thin films of calcia–alumina binary compounds

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Abstract

UV–visible optical spectra were obtained at room temperature in air for solution-processed thin films of 12CaO·7Al2O3(C12A7) on the MgO <100> single crystal substrates after the post-deposition heat treatment at 1,100 °C. Two absorption peaks were observed at 5.3 and 6.1 eV and their presence was attributed to the complex electronic structure of C12A7 and its different energy levels due to the extra-framework species and the framework itself. The peak at 5.3 eV is believed to be associated with O2−-Cage Conduction Band type transition whereas the Framework Valence Band to Framework Conduction Band transition is responsible for the peak at 6.1 eV. The nature of electronic transition was found to be direct from the analysis due to Tauc’s law.

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Acknowledgments

The first author (M.Z.) is grateful to LP Displays Ltd, Blackburn, UK for partial funding of the studentship. Thanks are also due to Professor Steve Watts of the University of Manchester and to Professor Arokia Nathan of University College, London for fruitful discussions.

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Authors and Affiliations

  1. School of Engineering and Materials, Queen Mary, University of London, Mile End Road, London, E1 4NS, UK

    M. Zahedi

  2. The Wolfson Centre for Materials Processing, Brunel University, Uxbridge, Middlesex, UB8 3PH, UK

    A. K. Ray

Authors
  1. M. Zahedi
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  2. A. K. Ray
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Correspondence to A. K. Ray.

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Zahedi, M., Ray, A.K. Optical absorption in solution processed thin films of calcia–alumina binary compounds. J Sol-Gel Sci Technol 55, 317–321 (2010). https://doi.org/10.1007/s10971-010-2255-0

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  • DOI: https://doi.org/10.1007/s10971-010-2255-0

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