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Issue 60, 2018, Issue in Progress
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Stabilization of divalent Eu2+ in fluorosilicate glass-ceramics via lattice site substitution

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Abstract

Fluorosilicate glasses and glass-ceramics with MF2 (M = Ca, Sr, Ba), ZnF2 or LaF3 components were investigated to host divalent Eu2+ for photoluminescence (PL) application. X-ray diffraction phase identification and a series of spectroscopic analyses were performed to reveal the relationship between microstructure and the reduction of Eu3+ → Eu2+. The precursor glasses were believed being constituted by silicate-rich phases and fluoride-rich phases, due to the immiscibility of fluoride-and-silicate mixed glass system. After heat treatment, the fluoride-rich glass phases could transform into fluoride crystalline phase in the glass-ceramics. Europium tended to enrich in the fluoride-rich phases in the glasses or in the precipitated fluoride crystalline phases in the glass-ceramics. Small amounts of Eu3+ were reduced to Eu2+ in the glasses where the electronegativity had a crucial impact. In contrast, large amounts of Eu3+ were reduced to Eu2+ in the glass-ceramics containing MF2 nanocrystals, where the reduction was determined by lattice site substitution. Using ZnAl2O4 containing glass-ceramics as reference, it was evidenced that the similar and a little larger radii between sites and substitution ions are the prerequisite for Eu3+/M2+ substitution. And using LaF3 containing glass-ceramics as reference, it was certified that unbalanced charge at substitution sites induce the Eu3+ → Eu2+ reduction.

Graphical abstract: Stabilization of divalent Eu2+ in fluorosilicate glass-ceramics via lattice site substitution

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Publication details

The article was received on 15 Aug 2018, accepted on 17 Sep 2018 and first published on 08 Oct 2018


Article type: Paper
DOI: 10.1039/C8RA06843G
RSC Adv., 2018,8, 34536-34542
  • Open access: Creative Commons BY-NC license
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    Stabilization of divalent Eu2+ in fluorosilicate glass-ceramics via lattice site substitution

    C. Wang, X. Chen, X. Luo, J. Zhao, X. Qiao, Y. Liu, X. Fan, G. Qian, X. Zhang and G. Han, RSC Adv., 2018, 8, 34536
    DOI: 10.1039/C8RA06843G

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