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 Effect of Eu2O3 doping on Ta2O5 crystal growth by the laser-heated pedestal technique
Please use this identifier to cite or link to this item http://hdl.handle.net/10773/6082

title: Effect of Eu2O3 doping on Ta2O5 crystal growth by the laser-heated pedestal technique
authors: Saggioro, B.Z.
Andreeta, M.R.B.
Hernandes, A.C.
MacAtro, M.
Peres, M.
Costa, F.M.
Monteiro, T.
Franco, N.
Alves, E.
keywords: A1. Crystal structure
A1. Doping
A1. Heat transfer
A2. Laser-heated pedestal growth
B1. Oxides
B1. Rare earth compounds
issue date: 15-Dec-2010
publisher: Elsevier
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
URI: http://hdl.handle.net/10773/6082
ISSN: 0022-0248
publisher version/DOI: dx.doi.org/10.1016/j.jcrysgro.2010.09.083
source: Journal of Crystal Growth
appears in collectionsFIS - Artigos
I3N - Artigos

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