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Colour centre formation in corundum doped with divalent ions
Author(s) -
Kvapil Jiři,
Perner B.,
Súlovský J.,
Kvapil Jos.
Publication year - 1973
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.19730080125
Subject(s) - corundum , irradiation , argon , doping , ion , oxygen , hydrogen , divalent , absorption (acoustics) , analytical chemistry (journal) , materials science , chemistry , mineralogy , inorganic chemistry , photochemistry , metallurgy , environmental chemistry , optoelectronics , composite material , physics , organic chemistry , nuclear physics
Abstract The colour changes of corundum crystals annealed in hydrogen, oxygen and argon, and exposed to an UV irradiation is described. The comparison of samples doped with Be, Mg, or Fe is given. The change from pink colour to brown of rubies as well as the yellow colour of sapphires is attributed to the O − centre formation which causes an increase of the absorption between 400 to 480 nm.