Fundamental studies of magneto-optical borogermanate glasses and derived optical fibers containing Tb3+
| Autor: | Conrado Ramos Moreira Afonso, Jorlandio F. Felix, Marcelo Nalin, Valmor Roberto Mastelaro, Douglas F. Franco, Younes Messaddeq, Hellmut Eckert, Roger Gomes Fernandes, Sandra Helena Messaddeq, Steeve Morency |
|---|---|
| Přispěvatelé: | Universidade Estadual Paulista (Unesp), University of Brasília, Universidade de São Paulo (USP), Universidade Federal de São Carlos (UFSCar), Université Laval |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
lcsh:TN1-997
Materials science Optical fiber Analytical chemistry chemistry.chemical_element NANOPARTÍCULAS Germanium Terbium 02 engineering and technology 01 natural sciences law.invention Biomaterials symbols.namesake law 0103 physical sciences Optical fibers lcsh:Mining engineering. Metallurgy 010302 applied physics Extended X-ray absorption fine structure Verdet constant Metals and Alloys Magneto-optical glasses 021001 nanoscience & nanotechnology Magnetic susceptibility XANES Surfaces Coatings and Films chemistry Ceramics and Composites symbols Faraday rotation 0210 nano-technology Raman spectroscopy |
| Zdroj: | Scopus Repositório Institucional da UNESP Universidade Estadual Paulista (UNESP) instacron:UNESP Journal of Materials Research and Technology, Vol 11, Iss, Pp 312-327 (2021) Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual) Universidade de São Paulo (USP) instacron:USP |
| Popis: | Made available in DSpace on 2021-06-25T11:13:28Z (GMT). No. of bitstreams: 0 Previous issue date: 2021-03-01 New magnetic glass compositions, based on system (100-x) (60GeO2 -25B2O3 -4Al2O3 -10Na2O-1PbO) - xTb4O7 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 μm, limited by absorption due to 4f8 -> 4f7 5 d 1and 4f8 -> 4f8 transitions of Tb3+. XANES and EXAFS measurements at the Ge-K edge show that the germanium atoms are always tetrahedrally coordinated, while results at the Tb-LIII edge shows terbium atoms to be eight-coordinated and exclusively present in the oxidation state 3+ independently of the glass composition. MO measurements show that the Verdet constant (VB) increases linearly with the Tb3+ concentration reaching the value of -83.9 rad T-1m-1 at 650 nm for glass containing 8 mol% of Tb4O7. Good thermal stability (ΔT = 200 °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. Institute of Chemistry São Paulo State University UNESP Institute of Physics Applied Physics Center University of Brasília São Carlos Institute of Physics São Paulo University USP Department of Materials Engineering (DEMa) Federal University of São Carlos UFSCar Centre d'Optique Photonique et Laser Université Laval Institute of Chemistry São Paulo State University UNESP |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|