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Characterisation of oxygen defects in calciumdifluoride |
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| Authors: | Janis Sils Evgeny Radzhabov |
| Institution: | a Fachbereich Physik, Universität Osnabrück, Barbarastraße 7, 49076 Osnabrück, Germany b Vinogradov Institute of Geochemistry, Russian Academy of Sciences, P.O. Box 4019, 664033 Irkutsk, Russia |
| Abstract: | We study the aggregation of oxygen dipoles well dispersed in a CaF2 crystal upon annealing at temperatures ranging from 370 to 420 K. The concentration of oxygen dipoles is monitored by measuring the intensity of the ionic thermocurrent peak as well as by absorption and luminescence spectroscopies. Results from three methods agree within experimental error and yield an activation energy of (1.2±0.1) eV for the diffusion of isolated oxygen centres in the crystal. |
| Keywords: | A Optical materials D Colour centres D Defects D Luminescence D Optical properties |
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