1. Transparent Glasses and Glass-Ceramics in the Ternary System TeO2-Nb2O5-PbF2
- Author
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Fabia Castro Cassanjes, Gael Poirier, Sylvain Danto, Gislene Batista, Evelyne Fargin, Thierry Cardinal, Juliana Santos Barbosa, Institute of Science and Technology, Federal University of Alfenas, Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB), Université de Bordeaux (UB)-Institut Polytechnique de Bordeaux-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), This research was funded by brazilian agencies FAPEMIG, FAPESP, FINEP, CNPq and CAPES and Agence Nationale de la Recherche (ANR) (ANR-10-IDEX-03-02, ANR-17-CE08-0042-01), the Idex Bordeaux and the New Aquitaine Region., ANR-17-CE08-0042,PROTEus,ImPRession laser de fibres exOtiques Multi-MaTEriaux(2017), and ANR-10-IDEX-0003,IDEX BORDEAUX,Initiative d'excellence de l'Université de Bordeaux(2010)
- Subjects
Materials science ,crystallization ,Nucleation ,chemistry.chemical_element ,02 engineering and technology ,01 natural sciences ,lcsh:Technology ,Article ,law.invention ,law ,0103 physical sciences ,General Materials Science ,Ceramic ,Crystallization ,Thermal analysis ,lcsh:Microscopy ,europium ,glass ,lcsh:QC120-168.85 ,010302 applied physics ,Ternary numeral system ,Glass-ceramic ,fluoride ,lcsh:QH201-278.5 ,Precipitation (chemistry) ,lcsh:T ,[CHIM.MATE]Chemical Sciences/Material chemistry ,glass-ceramic ,021001 nanoscience & nanotechnology ,chemistry ,Chemical engineering ,13. Climate action ,lcsh:TA1-2040 ,visual_art ,visual_art.visual_art_medium ,lcsh:Descriptive and experimental mechanics ,lcsh:Electrical engineering. Electronics. Nuclear engineering ,0210 nano-technology ,Europium ,tellurite ,lcsh:Engineering (General). Civil engineering (General) ,lcsh:TK1-9971 - Abstract
Transparent fluorotellurite glasses were prepared by melt-quenching in the ternary system TeO2-Nb2O5-PbF2. The synthesis conditions were adjusted to minimize fluorine loss monitored as HF release. It was found that 10 mol% of Nb2O5 is the optimum content for PbF2 incorporation up to 35 mol% in the tellurite matrix without loss of glass forming ability. Such glass compositions exhibit a wide optical window from 380 nm to about 6 &mu, m. Crystallization properties were carefully investigated by thermal analysis and compositions with higher PbF2 contents exhibit preferential precipitation of lead oxyfluoride Pb2OF2 at lower temperatures. The lead oxyfluoride crystallization mechanism is also governed by a volume nucleation, barely reported in tellurite glasses. Eu3+ doping of these glass compositions also promotes a more efficient nucleation step under suitable heat-treatments, resulting in transparent Eu3+-doped glass-ceramics whereas undoped glass-ceramics are translucent. Finally, Eu3+ spectroscopy pointed out a progressive, more symmetric surrounding around the rare earth ions with increasing PbF2 contents as well as higher quantum efficiencies. These new fluorotellurite glass compositions are promising as luminescent hosts working in the middle infrared.
- Published
- 2021
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