Dynamics of light-induced NIR-absorption of Nb4+ polarons in SBN : Cr crystals at low temperature
| Autor(en): | Gao, M Vikhnin, V Kapphan, S |
Stichwörter: | Cr3+/4+-centers; light-induced absorption; non-monoexponential decay; Nuclear Science & Technology; Physics; Physics, Condensed Matter; Physics, Fluids & Plasmas; polarons; Sr(x)Ba(1-x)Nb(2)Or(6) (SBN) | Erscheinungsdatum: | 1999 | Herausgeber: | GORDON BREACH SCI PUBL LTD | Journal: | RADIATION EFFECTS AND DEFECTS IN SOLIDS | Volumen: | 151 | Ausgabe: | 1-4 | Startseite: | 51 | Seitenende: | 55 | Zusammenfassung: | The dynamics of light-induced (Kr+, Ar+-laser) electronic polarons (Nb4+ centers with broad absorption band around 0.8 eV) and light-induced centers of other types were investigated in SrxBa1-xNb2O6:Cr (SBN:Cr) and in SBN:Ce using FTIR absorption measurements at low temperature. A theoretical model involving Cr3+/Ca4+, Ce3+/Ce4+ Nb4+ electronic polarons and trapping X-centers is proposed. The trapping of polarons at Cr4+/Ce4+ centers with subsequent recharging is shown to play an important role in the polaron dynamics. The predictions of the model are in very good agreement with the experimental results. |
Beschreibung: | 8th Europhysical Conference on Defects in Insulating Materials (EURODIM98), UNIV KEELE, KEELE, ENGLAND, JUL 06-11, 1998 |
ISSN: | 10420150 | DOI: | 10.1080/10420159908245936 |
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geprüft am 01.06.2024
