| Texto completo | |
| Autor(es): |
Franco, Douglas F.
[1]
;
Fernandes, Roger G.
[1]
;
Felix, Jorlandio F.
[2]
;
Mastelaro, Valmor R.
[3]
;
Eckert, Hellmut
[3]
;
Afonso, Conrado R. M.
[4]
;
Messaddeq, Younes
[5, 1]
;
Messaddeq, Sandra H.
[5]
;
Morency, Steeve
[5]
;
Nalin, Marcelo
[1]
Número total de Autores: 10
|
| Afiliação do(s) autor(es): | [1] Sao Paulo State Univ UNESP, Inst Chem, BR-14801970 Araraquara, SP - Brazil
[2] Univ Brasilia, Appl Phys Ctr, Inst Phys, BR-70919970 Brasilia, DF - Brazil
[3] Sao Paulo Univ USP, Sao Carlos Inst Phys, BR-13566590 Sao Carlos, SP - Brazil
[4] Fed Univ Sao Carlos UFSCar, Dept Mat Engn DEMa, BR-13565905 Sao Carlos, SP - Brazil
[5] Univ Laval, Ctr Opt Photon & Laser, Quebec City, PQ G1V 0A6 - Canada
Número total de Afiliações: 5
|
| Tipo de documento: | Artigo Científico |
| Fonte: | JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T; v. 11, p. 312-327, MAR-APR 2021. |
| Citações Web of Science: | 0 |
| Resumo | |
New magnetic glass compositions, based on system (100-x) (60GeO(2) -25B(2)O(3) -4Al(2)O(3) -10Na(2)O-1PbO) -xTb(4)O(7) were prepared by the melt-quenching technique. The materials were systematically characterized with respect to their structural (XRD, EXAFS, XANES and Raman), thermal (DSC), morphological, optical, magnetic and magneto-optical (MO) properties. Morphological and magnetic measurements show the homogeneous distribution of the Tb3+ ions as the magnetic susceptibility increases proportionally to the rare earth content. The optical window covers the range from 0.5 up to 1.6 mu m, limited by absorption due to 4f(8) -> 4f(7) 5 d (1)and 4f(8) -> 4f(8) transitions of Tb3+. XANES and EXAFS measurements at the GeeK edge show that the germanium atoms are always tetrahedrally coordinated, while results at the Tb-L-III edge shows terbium atoms to be eight-coordinated and exclusively present in the oxidation state 3thorn independently of the glass composition. MO measurements show that the Verdet constant (V-B) increases linearly with the Tb3+ concentration reaching the value of -83.9 rad T(-1)m(-1) at 650 nm for glass containing 8 mol % of Tb4O7. Good thermal stability (DT 1/4 200 degrees C) allowed obtaining an optical fiber of a glass containing 4 mol% of Tb4O7 featuring VB values of -37.9, -23.6 and -5.89 rad T-1 m(-1), at 500, 650 and 1550 nm, respectively. (c) 2021 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/). (AU) | |
| Processo FAPESP: | 18/19272-4 - Produção de fibras ópticas de metais pesados para uso em rotadores de Faraday |
| Beneficiário: | Douglas Faza Franco |
| Modalidade de apoio: | Bolsas no Exterior - Estágio de Pesquisa - Pós-Doutorado |
| Processo FAPESP: | 13/07793-6 - CEPIV - Centro de Ensino, Pesquisa e Inovação em Vidros |
| Beneficiário: | Edgar Dutra Zanotto |
| Modalidade de apoio: | Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs |
| Processo FAPESP: | 16/16900-9 - Preparação de fibras de vidros óxidos de metal pesado com propriedades ópticas e magneto-ópticas |
| Beneficiário: | Douglas Faza Franco |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |