Transparent Sol-Gel Oxyfluoride Glass-Ceramics with High Crystalline Fraction and Study of RE Incorporation
Transparent oxyfluoride glass-ceramic films and self-supported layers with composition 80SiO<sub>2</sub>-20LaF<sub>3</sub> doped with Er<sup>3+</sup> have been successfully synthesized by sol-gel process for the first time. Crack-free films and self-supported laye...
| Autores: | , , , , , , , , , , , |
|---|---|
| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2019 |
| País: | España |
| Institución: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/180713 |
| Acceso en línea: | http://hdl.handle.net/10261/180713 |
| Access Level: | acceso abierto |
| Palabra clave: | Glass-ceramic Oxyfluoride Rare-earth Crystallization Sol-gel |
| Sumario: | Transparent oxyfluoride glass-ceramic films and self-supported layers with composition 80SiO<sub>2</sub>-20LaF<sub>3</sub> doped with Er<sup>3+</sup> have been successfully synthesized by sol-gel process for the first time. Crack-free films and self-supported layer with a maximum thickness up to 1.4 µm were obtained after heat treatment at the low temperature of 550 °C for 1 min, resulting in a LaF<sub>3</sub> crystal fraction of 18 wt%, as confirmed by quantitative Rietveld refinement. This is the highest value reported up to now for transparent oxyfluoride glass-ceramics prepared by sol-gel. This work provides a new synthesis strategy and opens the way to a wide range of potential applications of oxyfluoride glass-ceramics. The characterization by a wide range of techniques revealed the homogeneous precipitation of LaF<sub>3</sub> nanocrystals into the glass matrix. X-ray absorption spectroscopy and electron paramagnetic resonance confirmed that the Er<sup>3+</sup> ions are preferentially embedded in the low phonon-energy LaF<sub>3</sub> nanocrystals. Moreover, photoluminescence (PL) measurements confirmed the incorporation of dopants in the LaF<sub>3</sub> nanocrystals. The effective concentration of rare-earth ions in the LaF<sub>3</sub> nanocrystals is also estimated by X-ray absorption spectroscopy. |
|---|