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Formation of substitutional hydrogen centers in LiF:OH crystals
Author(s) -
Kamikawa T.
Publication year - 1975
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.2220680223
Subject(s) - irradiation , absorption band , impurity , annealing (glass) , ion , neutron , hydrogen , materials science , analytical chemistry (journal) , absorption spectroscopy , crystallography , chemistry , optics , nuclear physics , physics , organic chemistry , chromatography , composite material
ESR and infrared absorption are measured on neutron‐irradiated LiF:OH crystals. In unirradiated specimens an sharp absorption at 2.8 μ;m is observed and attributed to OH − ions coupled to a Mg impurity. After neutron irradiation the 2.8 μm band disappears and a broad band appears at 1930 cm −1 . When the irradiated crystal is annealed at higher temperatures, the 1930 cm −1 band increases a little and then decreases. In parallel with the decay of the 1930 cm −1 band, another absorption band grows peaking at 1013 cm −1 , which is attributed to U centers in LiF. H 0 centers are observed by ESR in neutron‐irradiated crystals. On annealing at higher temperatures the H 0 centers increase as the 1013 cm −1 band grows. While the 1013 cm −1 band increases monotonously with temperature, the H 0 centers decrease above 270 °C. It is concluded that hydrogen centres are produced by dissociation of OH‐ ions in neutron‐irradiated LiF:OH crystals and that immediately after irradiation U centers do not exist, which are formed in the course of annealing from the precursor suggested to be U 1 centers and afterwards from H 0 centers.