1. High refractive index IR lenses based on chalcogenide glasses molded by spark plasma sintering
- Author
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Zhiyong Yang, Frédéric Charpentier, Hongli Ma, Valentin Reux, Antoine Gautier, Sébastien Billon, Laurent Calvez, Anping Yang, Xianghua Zhang, Patrick Houizot, Hugues Tariel, Institut des Sciences Chimiques de Rennes (ISCR), Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA), Institut de Physique de Rennes (IPR), Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Centre National de la Recherche Scientifique (CNRS), DIAFIR, Jiangsu Normal University (JSNU), Institut Universitaire de France, IUF, Région Bretagne, Ministère de l'Education Nationale, de l'Enseignement Superieur et de la Recherche, MESR, European Regional Development Fund, ERDF, European Commission, EC, Horizon 2020 Framework Programme, H2020, Electronic Components and Systems for European Leadership, ECSEL: 826131, Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), and Université de Rennes (UR)-Centre National de la Recherche Scientifique (CNRS)
- Subjects
Materials science ,Glass compositions ,Chalcogenide ,Refractive index ,Spark plasma sintering ,Chalcogenide glass ,Sintering ,Optical characteristics ,High refractive index ,02 engineering and technology ,01 natural sciences ,Crystals ,Selenium compounds ,law.invention ,010309 optics ,chemistry.chemical_compound ,Tellurium compounds ,law ,Germanium compounds ,Telluride ,0103 physical sciences ,Crystallization ,Composite material ,[PHYS]Physics [physics] ,Molding ,High-refractive-index polymer ,Melt-quenched glass ,Temperature ,021001 nanoscience & nanotechnology ,Crystallization rates ,Electronic, Optical and Magnetic Materials ,chemistry ,Powder granulometry ,Glass ,Mechanical alloying ,0210 nano-technology ,Milling (machining) ,Chalcogenides ,Mechanical milling - Abstract
International audience; In this work, spark plasma sintering is used to mold non conventional chalcogenide glasses of high refractive index at low temperature (andlt;400°C). This equipment, usually used for sintering refractory materials, is presented as efficient for both densification and high precision molding of IR transparent bulks and lenses of telluride glasses. Thermo-mechanical and optical characteristics of the selected Ge25Se10Te65 glass composition were investigated showing a refractive index of 3,12@10 µm and with however a limited resistance to crystallization. Mechanical milling of raw Ge, Se, Te elements leads to a major amorphous phase with the formation of a small proportion of GeTe crystals. Remaining GeTe crystals induce a fast crystallization rate during the sintering process leading to the opacity of the material. SPS flash moldings were then performed using melt quenched glass powders to produce complex lenses. It has been found that the critical parameter to reach optimal IR transparency is mainly the powder granulometry, which should be superior to 100 µm to prevent from MIE scatterings. The possibility of producing high refractive index infrared lenses has been demonstrated even with unstable glasses against crystallization. © 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
- Published
- 2021
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