A5014804210- Glass properties and applications
- Luminescence Properties of Advanced Materials
- Solid State Laser Technologies
- Microwave Dielectric Ceramics Synthesis
- Pigment Synthesis and Properties
- Cultural Heritage Materials Analysis
- Material Science and Thermodynamics
- Ga2O3 and related materials
- Laser-induced spectroscopy and plasma
- Optical properties and cooling technologies in crystalline materials
- Nuclear materials and radiation effects
- Inorganic Fluorides and Related Compounds
- X-ray Spectroscopy and Fluorescence Analysis
- Natural Fiber Reinforced Composites
- Atmospheric Ozone and Climate
- Spectroscopy and Laser Applications
- Lanthanide and Transition Metal Complexes
Instituto de Cerámica y Vidrio
2019-2025
Université d'Angers
2019
College Track
2019
Abstract Stained‐glass windows are often painted with grisailles and enamels. These glassy materials have a low melting temperature fixed to the base glass by firing processes. Lead and/or boron commonly added painting material lower their so that they can melt without deforming support. In present study, model samples (with well‐known content), replica historical were analysed for composition using Laser Ablation Inductively Coupled Plasma Mass Spectrometry (LA‐ICP‐MS) Induced Breakdown...
Transparent oxyfluoride glass-ceramics doped with rare earth ions (RE3+) are promising materials for photoluminescence up- and down-conversion. In this study, glass compositions within the system 40SiO2–25Al2O3–18Li2O–7LiF–10YF3 (mol.%) ErF3 codoped ErF3/YbF3 were prepared by melt-quenching method subjected to thermal treatment at temperatures above transition (Tg + 35 °C) long dwell times obtain corresponding glass-ceramics. The formation of LiYF4 LiAlSiO4 nanocrystals was confirmed XRD...
Oxyfluoride glass-ceramics (OxGCs) are transparent materials composed by an oxide glass matrix with homogeneously distributed fluoride nanocrystals. In particular, OxGCs RE-doped lanthanide-fluoride nanocrystals of special interest for photonic applications. More than 600 publications including several review papers were indexed on Scopus related to “glass-ceramics” revealing the importance topic. Melt-quenching followed thermal treatment, is most used preparation method, which allows in...
Nd3+-doped, LaF3-based, transparent oxyfluoride glass-ceramics (GCs) containing Ag nanoparticles (NPs) have been prepared by a melt-quenching method. Different Ag-containing precursors were employed being AgNO3 the most suitable for obtaining NPs segregated in glassy matrix. Transmission electron microscopy and X-ray absorption spectroscopy determined presence of Ag0 NPs, with higher concentrations produced an inert atmosphere (N2). The spectral features emission excitation spectra, addition...
Abstract Transparent NaLuF 4 glass‐ceramics (GCs) doped with Tm 3+ and /Yb have been prepared by melting‐quenching followed thermal treatment at temperatures near the glass transition temperature. The crystallization process has studied using X‐ray diffraction (XRD) high‐resolution transmission electron microscopy (HRTEM). nanocrystals (NCs) ranging 9–30 nm in size are only crystalline phase, crystal increasing dopant concentration. Energy dispersive (EDX) measurements confirm Yb...
Eu/Ag-co-doped transparent oxyfluoride glass-ceramics based on LaF3 have been obtained by melt-quenching followed structural analysis employing X-ray diffraction and transmission electron microscopy. Absorption spectra showed only Eu3+ ion transitions, irrespective of the presence silver or atmosphere used in preparation. Excitation collecting luminescence at 437 nm (Eu2+) 612 (Eu3+) indicated partial reduction to Eu2+. As a consequence, tuning excitation wavelength, variety emission are...
Transparent oxyfluoride glass-ceramics (GCs) containing KLaF4 nanocrystals (NCs) doped with Nd3+were prepared by Spark Plasma Sintering (SPS). Glass powder pellets were sintered under a vacuum atmosphere, optimizing the processing parameters such as particle size, pressure, temperature, and holding time to obtain full densification. Transparency decreased when decreasing size due higher carbon contamination from die. The α-KLaF4 crystalline phase was identified X-ray diffraction (XRD) its...
Tm3+ doped oxyfluoride glass-ceramics (GCs) containing NaLaF4 nanocrystals (NCs) have been obtained by spark plasma sintering (SPS). First, the precursor glasses were melted and then milled sieved to a suitable particle size. Glass powder pellets sintered under vacuum conditions. The SPS processing parameters (temperature, pressure, holding time) optimized obtain transparent glass-ceramics. times of are considerably shorter compared with those for preparation these GCs conventional thermal...
In the present study, oxyfluoride glass-ceramics (GCs) containing NdF<sub>3</sub>-doped LaF<sub>3</sub> nanocrystals were prepared with different amounts of Ag as a co-dopant. The structural and optical properties GCs characterized to identify presence metallic nanoparticles, well their role in Nd<sup>3+</sup> photoluminescence. Site-selective emission spectra show that co-doped samples, thermally treated an N<sub>2</sub> atmosphere, exhibit increased luminescence ions crystalline phase...
Abstract The influence of Al 2 O 3 addition on the precipitation NaYF 4 crystals in oxyfluoride glasses has been investigated through thermal, structural, and optical characterization parent corresponding glass–ceramics (GCs). high‐resolution transmission electron microscopy analysis GC with 5 mol% shows presence phase‐separated droplets about 69 nm size containing several nanocrystals diameter 10–15 nm. Raman magic angle spinning nuclear magnetic resonance (MAS‐NMR) spectroscopy were used...
In this work, transparent oxyfluoride glass-ceramics (GC) containing KLaF <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">4</sub> nanocrystals doped with 0.1 and 0.5 mol% of NdF xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> , obtained by combining melt quenching Spark Plasma Sintering (SPS), are investigated. X-Ray Diffraction (XRD) High Resolution Transmission Microscopy (HRTEM) confirm the presence cubic ( α) hexagonal β) polymorph ....
Transparent oxyfluoride glass-ceramics (GCs) containing NaLuF4 nanocrystals doped with Er3+ have been prepared by combination of glass melt-quenching and spark plasma sintering (SPS) powders. The parameters, such as temperature, pressure, particle size holding times were optimized to obtain the densification powdered samples together desired transparency. major advantage this technique is shorter (few minutes) compared those used for preparation these GCs conventional heat treatments (more...
In this work, the study of near infrared to visible upconversion (UC) emission in transparent sodium lutetium fluoride glass-ceramics doped with ErF <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> and co-doped YbF is reported. Intense UC green red emissions due ( <sup xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> H xmlns:xlink="http://www.w3.org/1999/xlink">11/2</sub> , xmlns:xlink="http://www.w3.org/1999/xlink">4</sup> S...
Studies of the spectroscopic properties lead-gallium oxyfluoride
Tm3+ doped oxyfluoride glass-ceramics (GCs) containing NaLaF4 nanocrystals (NCs) have been obtained by spark plasma sintering (SPS). First, the precursor glasses were melted and then milled sieved in a suitable particle size. Glass powder pellets sintered under vacuum conditions. The SPS processing parameters (temperature, pressure holding time) optimized to obtain transparent glass-ceramics. times of are considerably shorter compared with those for preparation these GCs conventional thermal...