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Title: Structural, optical and magnetic resonance properties of TiO2 fibres grown by laser floating zone technique
Author: Rodrigues, Joana
Peres, Marco
Fernandes, António
Graça, Manuel
Sobolev, Nicolai
Costa, Florinda
Monteiro, Teresa
Keywords: EPR
Issue Date: 2011
Publisher: Elsevier
Abstract: TiO2 fibres grown by the laser floating zone technique show the rutile crystalline phase as identified by X-ray diffraction and Raman spectroscopy. Scanning electron microscopy evidences a uniform surface, free of inclusions and without low-angle grain boundaries and bubbles. At low temperatures, the fibres luminescence is dominated by a richly structured optical centre with two well-defined zero-phonon lines at 1.579 eV and 1.574 eV followed by an intense vibronic sideband with a maximum close to 1.47 eV. Electron paramagnetic resonance revealed that substitutional chromium and iron ions are present as contaminants in the grown fibres, alongside with Ti3+ interstitials and other structural defects. The chemical nature of the defect responsible for the structured near-infrared luminescence is discussed.
Description: Partilhar documento na coleção da comunidade Laboratório Associado I3N
Peer review: yes
ISSN: 0169-4332
Appears in Collections:DFis - Artigos

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