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Photorefractive properties of LiNbO3:Zn crystals related to the defect structure |
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| Authors: | T Volk B Maximov T Chernaya N Rubinina M Wöhlecke V Simonov |
| Affiliation: | Russian Academy of Sciences, Institute of Crystallography, Moscow, Russia (Fax: +7-095/135-1011, E-mail: volk@ns.crys.ras.ru), RU Moscow State University, Moscow, Russia (E-mail: rubinina@mail.ru), RU Fachbereich Physik, Universit?t Osnabrück, 49069 Osnabrück, Germany (Fax: +49-541/969-3512, E-mail: manfred.woehlecke@uos.de), DE |
| Abstract: | 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. Received: 17 November 2000 / Revised version: 23 January 2001 / Published online: 20 April 2001 |
| Keywords: | PACS: 42 70 N 77 84 B 61 10 N |
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