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X-ray damage characterization in BaLiF3,KMgF3 and LiCaAlF6 complex fluorides |
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| Authors: | H. Sato A. Bensalah N. Solovieva A. Beitlerova A. Vedda M. Martini M. Nikl T. Fukuda |
| Affiliation: | a Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan b Laboratoire de Physico Chimie des Matériaux Luminéscents, UMR 5620 CNRS, Université Claude Bernard Lyon1, Villeurbanne 69622, France c Institute of Physics AS CR, Cukrovarnicka 10, Prague 16253, Czech Republic d Department of Material Science and INFM, University of Milan-Bicocca, via Cozzi 53, Milan 20125, Italy |
| Abstract: | Two-inch sized KMgF3,BaLiF3 and LiCaAlF6 (LiCAF) single crystals were grown by the Czochralski method under a CF4 atmosphere. X-ray irradiation was used to carry out a comparative study of induced optical absorption phenomena and colour centre creation in the ultra-violet and visible spectral regions. The integral of the induced absorption spectra is significantly lower in LiCAF with respect to the other studied materials. It is found that the amplitude of the F-absorption band is suppressed more than a factor of 3 by Mg-doping. For Mg-doped crystals, the optimum doping concentration is about 0.2 mol% of Mg2+. |
| Keywords: | Fluoride crystal Window material Induced absorption Colour centre |
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