Characterisation of oxygen defects in calciumdifluoride
| Autor(en): | Sils, Janis Radzhabov, Evgeny Reichling, Michael |
Stichwörter: | ALKALINE-EARTH FLUORIDE; CAF2; Chemistry; Chemistry, Multidisciplinary; colour centres; CRYSTALS; defects; DIPOLES; HALIDES; luminescence; optical materials; optical properties; OPTICAL-PROPERTIES; Physics; Physics, Condensed Matter; VACANCY CENTERS | Erscheinungsdatum: | 2007 | Herausgeber: | PERGAMON-ELSEVIER SCIENCE LTD | Journal: | JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS | Volumen: | 68 | Ausgabe: | 3 | Startseite: | 420 | Seitenende: | 425 | Zusammenfassung: | We study the aggregation of oxygen dipoles well dispersed in a CaF2 crystal upon annealing at temperatures ranging from 370 to 420K. 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. (c) 2006 Elsevier Ltd. All rights reserved. |
ISSN: | 00223697 | DOI: | 10.1016/j.jpcs.2006.12.003 |
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