NIR absorption and light-induced charge transfer in photorefractive Ba0.77Ca0.23TiO3 crystals doped with iron

DC FieldValueLanguage
dc.contributor.authorWierschem, M
dc.contributor.authorLindemann, T
dc.contributor.authorPankrath, R
dc.contributor.authorKapphan, SE
dc.date.accessioned2021-12-23T16:00:34Z-
dc.date.available2021-12-23T16:00:34Z-
dc.date.issued2001
dc.identifier.issn00150193
dc.identifier.urihttps://osnascholar.ub.uni-osnabrueck.de/handle/unios/4464-
dc.description3rd Asian Meeting on Ferroelectricity (AMF-3), HONG KONG, PEOPLES R CHINA, DEC 12-15, 2000
dc.description.abstractBarium-calcium-titanate crystals of the congruently melting composition Ba077Ca0.23TiO3 doped with iron to enhance photorefractive properties, is investigated by Fourier IR spectroscopy under Ar+-Laser irradiation at low temperatures. The light-induced absorption in the NIR and visible range (VIS) is investigated as a function of light intensity, temperature and time. The dependence on temperature and on light intensity of the decay of the light-induced absorption after switching-off the laser light reveals a characteristic behaviour. The light induced absorption of Ti3+ polarons around 0.7 eV can be quantitatively fit in its temperature, intensity and time dependence by a simple charge transfer model Fe2++Ti4+ <-> Fe3++Ti3+. The time- and temperature-dependence reveal tunnelling and thermally activated hopping contributions to the polaron decay. At room temperature both, the (NIR) Ti(3+-)polarons and the VIS-Centers are observed to be thermally ionized and no NIR light-induced absorption can be observed any more under steady state conditions.
dc.language.isoen
dc.publisherTAYLOR & FRANCIS LTD
dc.relation.ispartofFERROELECTRICS
dc.subjectbarium-calcium-titanate (BCT) crystal
dc.subjectcharge transfer model
dc.subjectFourier-IR spectroscopy
dc.subjectlight-induced absorption
dc.subjectMaterials Science
dc.subjectMaterials Science, Multidisciplinary
dc.subjectPhysics
dc.subjectPhysics, Condensed Matter
dc.subjectTi3+ polarons
dc.subjectTRANSPORT
dc.titleNIR absorption and light-induced charge transfer in photorefractive Ba0.77Ca0.23TiO3 crystals doped with iron
dc.typeconference paper
dc.identifier.isiISI:000177216100052
dc.description.volume264
dc.description.issue1-4
dc.description.startpage1973
dc.description.endpage1982
dc.publisher.place4 PARK SQUARE, MILTON PARK, ABINGDON OX14 4RN, OXON, ENGLAND
dcterms.isPartOf.abbreviationFerroelectrics
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