The peculiarities of fluoride glass structure. Spectroscopic study

Peculiarities of the oxyfluoride glasses' structure and crystallization

“…2) of the band of Nb-F vibrations (at 550 cm − 1 ) rises as a result of increasing BiF 3 concentration in the glass as if an additional band of Bi-F has appeared. The same result was also observed for fluoride glasses containing BiF 3 [15,21]. This suggests the presence of the fluorbismuth polyhedra in glass networks.…”

“…It should be noted that, in Raman spectra of MnNbOF 5 -BaF 2 glasses, the "boson" peak appears in the same place, near 45 cm − 1 , but its frequency decreases to 33 cm − 1 with modifier Pb in place of Ba. In the lowfrequency Raman spectra for glasses in the InF 3 -BaF 2 -BiF 3 system [15,21], we observed the same effect: the frequency of "boson" peak does not depend on the BiF 3 -content in glass. One can assume that the BiF 3 -polyhedra in the glasses under analysis do not enter in MRO but form their own layers or regions having no connection with the chains or rings formed by fluoroniobate ions.…”

“…It should be noted that T g in the MnNbOF 5 -BaF 2 system are within the range of 340-300°C [12]. After addition of BiF 3 to the glass and increase in BiF 3 content, the same temperature effects were observed in the fluoride glasses [15]. This situation can be explained by the fact that, with increasing of BiF 3 concentration in the glass, the content of refractory BaF 2 (T m = 1320°C) component decreases and results in decreasing of T g in the systems under study.…”

“…Based on previously identified changes in the structure and thermal properties of fluoride glasses to which bismuth trifluoride was added [15], the changes in the structure and the properties, including characteristics of the crystallization, in the oxyfluoride glasses obtained are also assumed. Accordingly, particular attention was given to the study of the structure and optical and thermal characteristics of glasses.…”

Research on effect of ZrO2 on thermal stability and structure of Ga/In based fluoride glasses

“…They are named c, d, e in turn. Bands c and d are associated with the stretching vibrations of non-bridging fluorine and Sn-F respectively [22]. Band e is thought to be ascribable to vibrational modes of the octahedral units [MF 6 ] (M = In, Ga) [23][24][25].…”