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  • 1 KFKI Research Institute for Particle and Nuclear Physics H-1525 Budapest 114 P.O. Box 49 Hungary
  • 2 KFKI Research Institute for Particle and Nuclear Physics H-1525 Budapest 114 P.O. Box 49 Hungary
  • 3 Institute for Solid State Physics and Optics Crystal Physics Laboratory H-1525 Budapest P.O. Box 49 Hungary
  • 4 Hungarian Academy of Sciences Institute of Chemistry, Chemical Research Center P.O. Box 17 H-1525 Budapest Hungary
  • 5 Al-Azhar University Cairo Egypt
  • 6 Johannes Gutenberg Universität Institut für Anorganische Chemie und Analytische Chemie D-55099 Mainz Germany
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Abstract  

57Co Mössbauer emission spectra of undoped and Fe or Mg melt-doped LiNbO3 single crystals show substantial amounts of the nucleogenic Fe3+ charge state (*Fe3+) which was generated as an after-effect of the electron-capture of 57Co2+. The proportion of *Fe3+ is markedly dependent on the Mg content and on the stoichiometry of the sample. Electron trapping is described within the model of competing acceptors. The capabilities of the model are investigated in defect structure analysis and charge trapping studies of LiNbO3.