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Optical study of the defect stability in Tl‐doped potassium iodide
Author(s) -
Rzepka E.,
Lefrant S.,
Taurel L.
Publication year - 1986
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221350115
Subject(s) - raman spectroscopy , thallium , electron paramagnetic resonance , iodine , thermal stability , doping , iodide , quenching (fluorescence) , ion , chemistry , analytical chemistry (journal) , materials science , radiochemistry , inorganic chemistry , nuclear magnetic resonance , fluorescence , optics , optoelectronics , physics , organic chemistry , chromatography
The thermal stability of the centres created in KI : Tl crystals submitted to an ionizing radiation at room temperature is studied. It is observed that F centres are transformed at room temperature, giving rise to more complex centres, unidentified either by EPR or Raman spectroscopy. The complementary hole centres consist of polyiodides in a low concentration and other complexes implying thallium and iodine interstitials. A recombination between some of these centres occurs at 127 °C. A quenching at LNT of a coloured sample annealed at 127 °C < T < 170 °C shows, by means of Raman experiments, that interstitials are still present since I − 3 ions are observed in large concentration.