The origin of the red luminescence in incipient ferroelectric KTaO3

DC FieldValueLanguage
dc.contributor.authorVikhnin, V
dc.contributor.authorEden, S
dc.contributor.authorAulich, M
dc.contributor.authorKapphan, S
dc.date.accessioned2021-12-23T16:16:07Z-
dc.date.available2021-12-23T16:16:07Z-
dc.date.issued2000
dc.identifier.issn00381098
dc.identifier.urihttps://osnascholar.ub.uni-osnabrueck.de/handle/unios/11730-
dc.description.abstractThe red luminescence at 686 nm in KTaO3 has been investigated in pure as-grown, ultra-high purity and doped (Al, Ba, Cr, Fe, Er, Li, Mg, Ni, Ph, V, Cr, Zr) crystals from different growth laboratories. In contrast to earlier results [P. Grenier, G. Bernier, S. Jandl, B. Salce, L.A. Boatner, J. Phys.: Cond. Matt 1(1989) 2515; P. Grenier, S. Jandl, M. Blouin, L.A. Boatner, Ferroel. 137 (1992) 105] which led to the conclusion that the main center should be an intrinsic defect Ta3+ O2- vacancy, we found a strong dependence on any kind of heat treatment (oxidation or reduction) leading to a decreasing or vanishing of the red luminescence after these treatments. The red luminescence was found to be sample dependent, together with a dependence on growth procedure. Therefore, excited metastable defect states which can be quenched in the same manner by reduction or oxidation treatments, have to be discussed as the origin of the red luminescence. The (i) two hole polarons localised near a Ta3+ (ii) Ta3+-O-0-center (a vibronic exciton with double charge transfer) and at last (iii) a pair of Ta3+, one in a Ta5+ site and the other in a K+ site are discussed as possible centers connected with the red luminescence. (C) 2000 Published by Elsevier Science Ltd. All rights reserved.
dc.language.isoen
dc.publisherPERGAMON-ELSEVIER SCIENCE LTD
dc.relation.ispartofSOLID STATE COMMUNICATIONS
dc.subjectferroelectrics
dc.subjectFLUORESCENCE
dc.subjectluminescence
dc.subjectMICROREGIONS
dc.subjectMULLER PHASE
dc.subjectoptical properties
dc.subjectPEROVSKITE-LIKE FERROELECTRICS
dc.subjectPhysics
dc.subjectPhysics, Condensed Matter
dc.subjectpoint defects
dc.subjectPOLAR MICRODOMAINS
dc.subjectRAMAN
dc.subjectSPECTRA
dc.subjecttime-resolved optical spectroscopies
dc.subjectTRANSFER VIBRONIC EXCITONS
dc.titleThe origin of the red luminescence in incipient ferroelectric KTaO3
dc.typejournal article
dc.identifier.doi10.1016/S0038-1098(99)00506-2
dc.identifier.isiISI:000085056700008
dc.description.volume113
dc.description.issue8
dc.description.startpage455
dc.description.endpage460
dc.publisher.placeTHE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
dcterms.isPartOf.abbreviationSolid State Commun.
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