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Luminescence properties of uranate centres in solids

  • Karel C. Bleijenberg
Conference paper
Part of the Structure and Bonding book series (STRUCTURE, volume 42)

Abstract

This paper deals with the luminescence of uranate centres in solids. The luminescence properties are influenced by the coordination number of the hexavalent uranium ion and by the crystallographic surroundings of the uranate centre. Transitions playing a role in the luminescence processes within the octahedral UO 6 6− group are discussed using the results from both theoretical and experimental studies on another octahedral uranium complex: UF6. The luminescence of the octahedral uranate group in oxidic compounds is discussed. Attention is paid to the vibrational structure, which is observed in the luminescence spectra at low temperatures and to the temperature quenching of the luminescence. The temperature quenching of the uranate luminescence in uranium-doped tungstates with ordered perovskite structure can be described in terms of a three state single configurational coordinate diagram. The complicated luminescence spectra of uranium-activated sodium fluoride (NaF-U) crystals have been unraveled using chemical variation of the crystal compositions and using site selective laser excitation techniques. Four different luminescent uranate centres have been observed in NaF-U. A model for the configurations of the luminescent centres has been deduced using the results from ionic conductivity experiments.

Keywords

Excitation Spectrum Luminescence Spectrum Luminescence Property Uranium Concentration Sodium Fluoride 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag 1980

Authors and Affiliations

  • Karel C. Bleijenberg
    • 1
  1. 1.Solid State Chemistry Department, Physical LaboratoryState UniversityTA UtrechtThe Netherlands

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