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Absorption spectra of molybdenum doped YAG crystals
Author(s) -
Kvapil Jiří,
Kvapil Josef,
Perner Bohumil,
Mánek Břetislav
Publication year - 1975
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.19750101007
Subject(s) - argon , molybdenum , valency , irradiation , annealing (glass) , absorption spectroscopy , doping , oxygen , materials science , ion , analytical chemistry (journal) , spectral line , hydrogen , absorption (acoustics) , chemistry , optics , metallurgy , optoelectronics , linguistics , philosophy , physics , organic chemistry , chromatography , astronomy , nuclear physics , composite material
Abstract Absorption spectra of molybdenum doped YAG crystals annealed in hydrogen, vacuum, oxygen and argon and exposed to an UV irradiation are given. Yellow or brown colour of the crystals is attributed to the O − centre formation connected with the reduction of molybdenum ions to a lower valency state. Most intensive yellow colour was shown by crystals, the argon annealing of which was followed by a treatment in oxygen at rather low temperature (∼1000 °C) and by UV irradiation. Two types of O − centres are suggested Blue colour of the samples annealed in argon is attributed to e − centres.