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19F MAS-NMR studies of strontium oxyfluoride aluminosilicate glass

✍ Scribed by M. Środa; Z. Olejniczak

Publisher
Elsevier Science
Year
2011
Tongue
English
Weight
874 KB
Volume
1001
Category
Article
ISSN
0022-2860

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✦ Synopsis

Local environment of fluorine atoms in the lanthanum oxyfluoride aluminosilicate glasses and glassceramics modified by SrO was studied by solid state 19 F MAS-NMR spectroscopy and X-ray diffraction. The effect of strontium concentration on the formation of crystalline LaF 3 phase was determined, as a function of heat treatment conditions. In all glasses studied, the F-Me(n) (where Me = Sr, La), but no Na-F species were observed. The presence of F-La,Sr(n) units, in which fluorine is coordinated by both lanthanum and strontium, was detected in the glass with higher content of SrO. Supplementary XRD analysis of this series confirmed that an increase of strontium contents leads to the formation of Sr 0.69 La 0.31 F 2.31 and LaSr 2 F 7 , instead of the pure LaF 3 only.

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