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H 2 O Related Centers in Potassium Chloride
Author(s) -
Kuczynski G. C.,
Dietz P. E.,
Hamill W. H.,
Jischke J. H.
Publication year - 1978
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.2220870222
Subject(s) - irradiation , potassium , aqueous solution , annealing (glass) , chloride , electron , chemistry , center (category theory) , electron beam processing , crystallography , analytical chemistry (journal) , photochemistry , nuclear chemistry , materials science , organic chemistry , physics , nuclear physics , quantum mechanics , composite material
Vacuum annealing of crystals of KCl at 600 °C produces stable defect centers which trap electrons during uv or γ irradiation as well as during additive coloration. When vacuum annealed crystals are exposed to 2 atm H 2 O at 200 °C prior to γ irradiation, coloration is suppressed, including the F band. This may be due to displacement of an electron from F by interstitial H 2 O which occupies V Cl −. When previously untreated crystals are exposed to 0.25 atm of HCl at 200 °C and γ‐irradiated, only one of the color centers previously mentioned is observed. The same center is produced in crystals grown from aqueous KCl containing HCl. The center is attributed to H 3 O + F. Precursor H 3 O + (and OH − ) is produced by heating in vacuum at 600 °C. Additional chemical reactions are required to account for the other bands.