Distribution of Pb2+ Ions in PbF2-Doped CaF2 Crystals |
| M. Paraschiva, I. Nicoara, M. Stef and O.M. Bunoiu
Department of Physics, West University of Timisoara, Bd. V. Parvan 4, Timisoara 300223, Romania |
| Received: May 11, 2009 |
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| Calcium fluoride crystals doped with various concentrations of PbF2 have been grown using the Bridgman technique. The optical absorption spectra reveal the characteristic UV absorption bands of the Pb2+ ions. The distribution of the Pb2+-ions along four crystals has been investigated using the optical absorption method. Taking into account the relationship between the optical absorption coefficient and the concentration of the impurities in the samples, the effective segregation coefficient of the Pb2+ ions has been calculated. Our study shows that the effective segregation coefficient of the Pb2+ ions in CaF2 host depends on the dopant concentration, and varies between 0.85 and 1.15, for 0.5 mol%PbF2 and 3 mol%PbF2-doped CaF2, respectively. |
| DOI: 10.12693/APhysPolA.117.466 PACS numbers: 42.70.Hj, 68.35.Dv, 78.20.Ci, 78.40.Ha, 81.10.Fq |