Photorefractive properties of LiNbO3:Zn crystals related to the defect structure

LiNbO3:Zn single crystals and powders were studied by precise X-ray diffraction methods. Structural refinement yielded new models of the intrinsic defect structure valid for different Zn concentration ranges. For concentrations up to 7 at.% in the crystal, Zn ions incorporate onto Li sites; at highe...

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Bibliographic Details
Published in:Applied physics. B, Lasers and optics Lasers and optics, 2001-05, Vol.72 (6), p.647-652
Main Authors: Volk, T., Maximov, B., Chernaya, T., Rubinina, N., Wöhlecke, M., Simonov, V.
Format: Article
Language:English
Subjects:
Crystal defects
Crystal structure
Crystals
Diffraction
Lasers
Niobium
Photoconductivity
Zinc
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Summary:LiNbO3:Zn single crystals and powders were studied by precise X-ray diffraction methods. Structural refinement yielded new models of the intrinsic defect structure valid for different Zn concentration ranges. For concentrations up to 7 at.% in the crystal, Zn ions incorporate onto Li sites; at higher concentrations Zn ions are found on both Li and Nb sites. Photorefractive properties of LiNbO3:Zn are discussed in the context of the deduced defect models. A smooth increase in the photoconductivity up to 7 at.%Zn is accounted for by a decrease of Nb antisites. Steeper growth of the photoconductivity at higher Zn concentrations is related to vanishing Li vacancies.
ISSN:0946-2171
1432-0649
DOI:10.1007/s003400100548