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Effect of Irradiation on Impurity–Vacancy Dipoles in KBr Crystals Doped with Strontium
Author(s) -
Muccillo R.,
Rolfe J.
Publication year - 1974
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.2220610223
Subject(s) - vacancy defect , impurity , dipole , strontium , irradiation , doping , relaxation (psychology) , potassium bromide , electron , ionic bonding , materials science , ion , analytical chemistry (journal) , chemistry , atomic physics , inorganic chemistry , crystallography , physics , psychology , social psychology , optoelectronics , organic chemistry , chromatography , quantum mechanics , nuclear physics
Abstract The concentration of impurity–vacancy dipoles in potassium bromide crystals doped with strontium bromide was measured using the ionic thermocurrent (ITC) technique. The parameters of the dipole relaxation are: fundamental relaxation time 4 × 10 −14 s , activation enthalpy 0.66 eV. The effect of 60 Co γ‐irradiation at room temperature was to reduce the number of dipoles and to increase the number of trapped holes and electrons, but the number of trapped holes and electrons, measured by optical absorption, was about 30 times smaller than the number of dipoles destroyed. It is proposed that the effect of irradiation is to increase the rate of aggregation of dipoles, primarily into trimer aggregates, through temporary electron trapping by strontium ions.