Abstract
The absorption spectra of radiation-colored CaF2, SrF2, and BaF2 crystals activated by trivalent Pr, Sm, Нo, Er, Tm, and Yb (rare-earth, RE) ions are studied. It is shown that ionizing radiation reduces the impurity ions to the divalent state. The temperature resistance of divalent RE ions of radiation-colored CaF2 crystals correlates with the chemical stability of the compounds with divalent RE ions. The photochromic centers are produced in CaF2-Pr crystal colored by radiation at room temperature and heated to 200°C.
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Original Russian Text © T.Yu. Sizova, V.Yu. Veslopolova, R.Yu. Shendrik, A.V. Egranov, E.A. Radzhapov, A.A. Shalaev, 2017, published in Izvestiya Rossiiskoi Akademii Nauk, Seriya Fizicheskaya, 2017, Vol. 81, No. 9, pp. 1210–1214.
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Sizova, T.Y., Veslopolova, V.Y., Shendrik, R.Y. et al. Divalent rare-earth ions Pr, Sm, Нo, Er, Tm, and Yb in crystals of alkaline-earth fluorides. Bull. Russ. Acad. Sci. Phys. 81, 1090–1093 (2017). https://doi.org/10.3103/S1062873817090234
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DOI: https://doi.org/10.3103/S1062873817090234