X-ray induced optical absorption in Li sub(2)B sub(4)O sub(7) and Li sub(2)B sub(4)O sub(7):Cu single crystals and glasses

The effect of X-ray irradiation of doses up to 2000 Gy on the spectral dependence of optical absorption (OA) has been investigated for single-crystal and glassy Li sub(2)B sub(4)O sub(7) (LTB) and Li sub(2)B sub(4)O sub(7):Cu (LTB:Cu). The irradiation of LTB:Cu single crystals leads to an increase o...

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Bibliographic Details
Published in:Physica. B, Condensed matter Condensed matter, 2014-10, Vol.450, p.34-38
Main Authors: Holovey, V M, Popovych, K P, Prymak, M V, Birov, M M, Krasilinets, V M, Sidey, V I
Format: Article
Language:English
Subjects:
ABSORPTION
AMORPHOUS STRUCTURE
Band spectra
Condensed matter
GLASSES
Glassy
IRRADIATION
Lithium tetraborate
Single crystals
Spectra
X RAYS
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Summary:The effect of X-ray irradiation of doses up to 2000 Gy on the spectral dependence of optical absorption (OA) has been investigated for single-crystal and glassy Li sub(2)B sub(4)O sub(7) (LTB) and Li sub(2)B sub(4)O sub(7):Cu (LTB:Cu). The irradiation of LTB:Cu single crystals leads to an increase of the OA intensity of the impurity bands and to formation of the induced OA band in the 3.3-4.3 eV range, whose spectral maximum shifts towards the lower-energy region with the dose increase. The irradiation of glassy LTB and LTB:Cu results in an increase of OA and, for LTB:Cu, in a shift of its short-wave edge towards the lower-energy region.
ISSN:0921-4526
DOI:10.1016/j.physb.2014.05.059