Please use this identifier to cite or link to this item:
http://hdl.handle.net/10773/6082
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DC Field | Value | Language |
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dc.contributor.author | Saggioro, B.Z. | pt |
dc.contributor.author | Andreeta, M.R.B. | pt |
dc.contributor.author | Hernandes, A.C. | pt |
dc.contributor.author | MacAtro, M. | pt |
dc.contributor.author | Peres, M. | pt |
dc.contributor.author | Costa, F.M. | pt |
dc.contributor.author | Monteiro, T. | pt |
dc.contributor.author | Franco, N. | pt |
dc.contributor.author | Alves, E. | pt |
dc.date.accessioned | 2012-02-09T11:52:37Z | - |
dc.date.issued | 2010-12-15 | - |
dc.identifier.issn | 0022-0248 | pt |
dc.identifier.uri | http://hdl.handle.net/10773/6082 | - |
dc.description.abstract | High energy band gap hosts doped with lanthanide ions are suitable for optical devices applications. To study the potential of Ta2O5 as a host compound, pure and Eu2O3-doped Ta2O5 crystal fibers were grown by the laser-heated pedestal growth technique in diameters ranging from 250 to 2600 μm and in lengths of up to 50 mm. The axial temperature gradient at the solid/liquid interface of pure Ta2O5 fibers revealed a critical diameter of 2200 μm above which the fiber cracks. X-ray diffraction measurements of the pure Ta2O5 single crystals showed a monoclinic symmetry and a growth direction of [1 1̄ 0]. An analysis of the pulling rate as a function of the fiber diameter for Eu2O3-doped Ta2O5 fibers indicated a well defined region in which constitutional supercooling is absent. Photoluminescence measurements of pure Ta2O5 crystals using excitation above the band gap (3.8 eV) were dominated by a broad unstructured green band that peaked at 500 nm. Three Eu3+-related optical centers were identified in the doped samples with nominal concentrations exceeding 1 mol%. Two of these centers were consistent with the ion in the monoclinic phase with different oxygen coordinations. The third one was visible in the presence of the triclinic phase | pt |
dc.description.sponsorship | FCT-PTDC/FIS/66262/2006 | pt |
dc.description.sponsorship | FCT-PTDC/CTM/66195/2006 | pt |
dc.description.sponsorship | FAPESP and CNPq(Brazil) | pt |
dc.language.iso | eng | pt |
dc.publisher | Elsevier | pt |
dc.relation.uri | http://www.scopus.com/inward/record.url?eid=2-s2.0-78549281363&partnerID=40&md5=975d1a2090ad352d4be9fafd95380968 | |
dc.rights | restrictedAccess | por |
dc.subject | A1. Crystal structure | pt |
dc.subject | A1. Doping | pt |
dc.subject | A1. Heat transfer | pt |
dc.subject | A2. Laser-heated pedestal growth | pt |
dc.subject | B1. Oxides | pt |
dc.subject | B1. Rare earth compounds | pt |
dc.title | Effect of Eu2O3 doping on Ta2O5 crystal growth by the laser-heated pedestal technique | pt |
dc.type | article | pt |
dc.peerreviewed | yes | pt |
ua.distribution | international | pt |
degois.publication.firstPage | 62 | pt |
degois.publication.issue | 1 | pt |
degois.publication.issue | 1 | |
degois.publication.lastPage | 67 | pt |
degois.publication.title | Journal of Crystal Growth | pt |
degois.publication.volume | 313 | pt |
dc.date.embargo | 10000-01-01 | - |
dc.identifier.doi | 10.1016/j.jcrysgro.2010.09.083 | * |
Appears in Collections: | DFis - Artigos I3N-FSCOSD - Artigos |
Files in This Item:
File | Description | Size | Format | |
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science.pdf | versão pdf do editor | 852.73 kB | Adobe PDF |
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