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Effect of γ‐irradiation on the lattice parameter and colour centre concentration in pure Ca 2+ , Sr 2+ and Eu 2+ doped KCI crystals
Author(s) -
Damm J. Z.,
StepieńDamm J.
Publication year - 1980
Publication title -
kristall und technik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0023-4753
DOI - 10.1002/crat.19800151017
Subject(s) - irradiation , lattice constant , doping , lattice (music) , analytical chemistry (journal) , crystal structure , drop (telecommunication) , materials science , impurity , crystallographic defect , crystallography , chemistry , optics , physics , nuclear physics , diffraction , telecommunications , optoelectronics , chromatography , computer science , acoustics , organic chemistry
Abstract The changes of lattice parameter and colour centre concentration are examined in KCI crystals (both pure and Me 2+ ‐doped) irradiated by γ‐rays at room temperature. For the pure crystals the relative volume change vs. F‐centre concentration plot reveals the presence of two stages, one ascribed to the introduction of colour centre pairs (or F centres only) and other to the generation of the new dislocations (or new dislocations with trapped‐hole centres). In Me 2+ doped crystals the lattice expansion bears a complex character (in the initial irradiation stage a transient maximum appears). Additional anomaly appears in Eu 2+ KCI in the high‐dose range where in spite of a distinct F‐centre concentration drop a marked raise of the lattice parameter is observed.