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Title: Microwave dielectric permittivity and photoluminescence of Eu 2O3 doped laser heated pedestal growth Ta 2O5 fibers
Author: Rubinger, C.P.L.
Costa, L.C.
Macatrão, M.
Peres, M.
Monteiro, T.
Costa, F.M.
Franco, N.
Alves, E.
Saggioro, B.Z.
Andreeta, M.R.B.
Hernandes, A.C.
Keywords: dielectric losses
dielectric materials
europium compounds
microwave materials
tantalum compounds
Issue Date: 25-Jun-2008
Publisher: AIP
Abstract: We report the microwave dielectric properties and photoluminescence of undoped and europium oxide doped Ta2O5 fibers, grown by laser heated pedestal growth technique. The effects of Eu2O3 doping 1–3 mol % on the structural, optical, and dielectric properties were investigated. At a frequency of 5 GHz, the undoped material exhibits a dielectric permittivity of 21 and for Eu2O3 doped Ta2O5 samples it increases, reaching up to 36 for the highest doping concentration. Nevertheless, the dielectric losses maintain a very low value. For this wide band gap oxide, Eu3+ optical activation was achieved and the emission is observed up to room temperature. Thus, the transparency and high permittivity make this material promising for electronic devices and microwave applications. © 2008 American Institute of Physics.
Description: Partilhar documento na coleção da comunidade Laboratório Associado I3N
Peer review: yes
ISSN: 0003-6951
Publisher Version:
Appears in Collections:DFis - Artigos
I3N-FSCOSD - Artigos

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