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Optical Properties of Borate Glass-Ceramics

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https://osnadocs.ub.uni-osnabrueck.de/handle/urn:nbn:de:gbv:700-2005020327
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DC ElementWertSprache
dc.contributor.advisorapl. Prof. Dr. Klaus Betzler
dc.creatorOprea, Isabella-Ioana
dc.date.accessioned2010-01-30T14:36:05Z
dc.date.available2010-01-30T14:36:05Z
dc.date.issued2005-02-03T17:18:17Z
dc.date.submitted2005-02-03T17:18:17Z
dc.identifier.urihttps://osnadocs.ub.uni-osnabrueck.de/handle/urn:nbn:de:gbv:700-2005020327-
dc.description.abstractOptical properties of bismuth borate are measured for the composition range x Bi2O3 (1-x) B2O3, 0.25 < x < 0.65. The refractive indices increase as the bismuth content is increasing. Also the ultraviolet absorption edge was shown to shift to longer wavelengths. From these measurements a generalized Sellmeier formula was derived. Applying heat treatments to the prepared bismuth borate glasses in order to obtain glass ceramics leads in most cases to surface nucleation. It was proved that dopants increase the number of nucleating sites on the surfaces. On erbium-doped samples absorption and luminescence measurements were made. The Judd-Ofelt analysis revealed comparably high Judd-Ofelt coefficients. All coefficients were shown to decrease as the Bi2O3 content increases. The luminescence at 1550 nm reveals a broad and flat band which is narrowing with the increase in Bi2O3 content. The green upconversion was observed and the temporal behavior of the emission at 550 nm was investigated. The absorption and emission spectra of chromium-doped bismuth borate glasses were measured. On surface crystallized glasses, for x = 0.5 Bi2O3 and high chromium content, luminescence of chromate (CrO2-4) ion doped BiBO3 microcrystals was observed. Strontium barium niobate microcrystals embedded in strontium barium borate matrix were obtained by spontaneous nucleation in the melt and rapid quenching. Optical properties of Pb2B5O9Br based glass were also investigated. The heat treatment applied leads to the formation of small nanocrystals inside the glass.eng
dc.language.isoeng
dc.subjectBismuth borate
dc.subjectglass
dc.subjectglass-ceramics
dc.subjectabsorption
dc.subjectluminescence
dc.subjectrefractive index
dc.subjectErbium
dc.subjectNeodym
dc.subjectChromium
dc.subject.ddc530 - Physikger
dc.titleOptical Properties of Borate Glass-Ceramicseng
dc.typeDissertation oder Habilitation [doctoralThesis]-
thesis.locationOsnabrück-
thesis.institutionUniversität-
thesis.typeDissertation [thesis.doctoral]-
thesis.date2005-01-28T12:00:00Z-
elib.elibid390-
elib.marc.edtfangmeier-
elib.dct.accessRightsa-
elib.dct.created2005-02-03T12:31:21Z-
elib.dct.modified2005-02-03T17:18:17Z-
dc.contributor.refereeDr. Ekaterina Shamonina
dc.subject.dnb29 - Physik, Astronomieger
vCard.ORGFB4ger
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