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Transparent Sol-Gel Oxyfluoride Glass-Ceramics with High Crystalline Fraction and Study of RE Incorporation

Authors
  • gorni, giulio
  • velázquez, jose j.
  • mosa, jadra
  • mather, glenn c.
  • serrano, aida
  • vila, maría
  • castro, germán r.
  • bravo, david
  • balda, rolindes
  • fernández, joaquín
  • durán, alicia
  • castro, yolanda
Publication Date
Apr 03, 2019
Source
MDPI
Keywords
Language
English
License
Green
External links

Abstract

C for 1 min, resulting in a LaF3 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 LaF3 nanocrystals into the glass matrix. X-ray absorption spectroscopy and electron paramagnetic resonance confirmed that the Er3+ ions are preferentially embedded in the low phonon-energy LaF3 nanocrystals. Moreover, photoluminescence (PL) measurements confirmed the incorporation of dopants in the LaF3 nanocrystals. The effective concentration of rare-earth ions in the LaF3 nanocrystals is also estimated by X-ray absorption spectroscopy.

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