Cu+ and OH- pairs defects interaction in NaF crystals

Autor(en): Fabris, JL
Muller, M
Hernandes, AC
SiuLi, M
Kapphan, S
Stichwörter: alkali halides; NaF; Nuclear Science & Technology; OH-/Cu+ impurities; Physics; Physics, Condensed Matter; Physics, Fluids & Plasmas
Erscheinungsdatum: 1995
Herausgeber: GORDON BREACH SCI PUBL LTD
Journal: RADIATION EFFECTS AND DEFECTS IN SOLIDS
Volumen: 134
Ausgabe: 1-4
Startseite: 353
Seitenende: 356
Zusammenfassung: 
The presence of Cu+ in OH- doped NaF crystal results in several new infrared absorption bands with similar to 0.2 cm(-) halfwidth at 100 K, and their relative intensities are strongly impurity concentration dependent. Their assignments are not evident and are mostly attributed to different vibrational internal modes of the molecular OH- perturbed by neighboring Cu+ ions.(1) We report the results of the temperature dependence of several OH- sidebands around the 3737.8 cm(-1) `free' OH- stretching mode. The temperature dependence reveals a different behaviour from already known OH- quasi free rotor in several cesium halides.(2) For the temperature range from 100 to 300 K, the free OH- halfwidth shows a T-2 behaviour. While for three chosen absorption sidebands are determined to be T-1.6, T-1.8 and T-2.5. The lack of observable thermally stimulated depolarization current and electric field induced dichroism(3) indicates that the OH- is frozen-in, so it is also the same with the OH--Cu+ pairs.
Beschreibung: 
7th Europhysical Conference on Defects in Insulating Materials (Eurodim 94), ECOLE NORMALE SUPIRIEURE LYON, LYON, FRANCE, JUL 05-08, 1994
ISSN: 10420150
DOI: 10.1080/10420159508227247

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