2019
DOI: 10.3389/fmats.2019.00165
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Structural Relaxation in Polyanionic Sodium Fluorophosphate Glasses

Abstract: Structural heterogeneity is a common feature of all glasses, however, little is known about the underlying contributions of chemical fluctuations and modulations in free volume in concrete glass forming systems. In this investigation, we relate the dynamics of structural relaxation of (100-x)NaPO 3-xAlF 3 glasses to their heterogeneous structure as determined from multinuclear magnetic resonance spectroscopic analysis. For this, we evaluate differential scanning calorimetry (DSC) data using the integral isocon… Show more

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Cited by 17 publications
(23 citation statements)
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“…Previously published 19 F-NMR of similar Na 2 O-P 2 O 5 -AlF 3 (NAPF) glasses found three different fluorine species: nonbridging fluorine, Al-F••Na + (located at −170 ppm), fluoride bridges, Al-F-Al (−147 ppm), and covalent P-F bonds (−75 ppm). 8,10 The existence of aluminum-fluoride bonds in the current series was confirmed by Raman spectroscopic analysis, at 540 cm −1 (νAl(F,O) 6 ) and 630 cm −1 (ν as Al-F) in Figure 2. The current Raman results, combined with previous NMR data on NAPF glasses, and with other literature 8,10,11 indicate that aluminum links to phosphate units through P-O-Al linkages to form Al(OP) 4 F 2 octahedra.…”
Section: Napfs Glass Molecular Structuresupporting
confidence: 61%
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“…Previously published 19 F-NMR of similar Na 2 O-P 2 O 5 -AlF 3 (NAPF) glasses found three different fluorine species: nonbridging fluorine, Al-F••Na + (located at −170 ppm), fluoride bridges, Al-F-Al (−147 ppm), and covalent P-F bonds (−75 ppm). 8,10 The existence of aluminum-fluoride bonds in the current series was confirmed by Raman spectroscopic analysis, at 540 cm −1 (νAl(F,O) 6 ) and 630 cm −1 (ν as Al-F) in Figure 2. The current Raman results, combined with previous NMR data on NAPF glasses, and with other literature 8,10,11 indicate that aluminum links to phosphate units through P-O-Al linkages to form Al(OP) 4 F 2 octahedra.…”
Section: Napfs Glass Molecular Structuresupporting
confidence: 61%
“…8,10 The existence of aluminum-fluoride bonds in the current series was confirmed by Raman spectroscopic analysis, at 540 cm −1 (νAl(F,O) 6 ) and 630 cm −1 (ν as Al-F) in Figure 2. The current Raman results, combined with previous NMR data on NAPF glasses, and with other literature 8,10,11 indicate that aluminum links to phosphate units through P-O-Al linkages to form Al(OP) 4 F 2 octahedra. We observe in Figure 4 by the respective growth of the Q 1 Al and Q 2 Al Raman bands at 1068 and 1090 cm −1 ).…”
Section: Napfs Glass Molecular Structuresupporting
confidence: 61%
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