Glasses in the CuNbOF5-BaF2 and CuNbOF5-PbF2 systems

Hydrothermal crystal growth of the potassium niobate and potassium tantalate family of crystals

“…4, for each material was taken from 400 to 4000 cm. The broad peak visible in all three spectra from 600 to 650 cm is attributed to the v3 mode of the corner shared NbO 6 and TaO 6 octahedra [42][43][44][45][46]. The areas of interest for water and hydroxide have none of the characteristic peaks in any of the spectra.…”

Bonding and Structure of Oxofluoroniobate-Based Glasses

“…Ignat’eva and co-workers used vibrational spectroscopy and quantum-chemical calculations to characterize the glass structure based mainly on the starting oxofluoroniobates such as CuNbOF 5 ·4H 2 O and MnNbOF 5 ·4H 2 O. Their numerous publications − evidence that the glass network is built from oxofluoroniobate polyhedra linked through oxygen bridges. However, the corresponding band is present in the IR spectrum but virtually absent in the Raman spectrum of the glasses.…”

Glasses in the system of MnNbOF5–BaF2–BiF3–ErF3

“…Most probably, the latter is related to the fact that, simultaneously with the changes in the MnNbOF 5 content, there occurs the change of the modifier (BaF 2 ) amount, which, as was shown earlier [6], has a substantial impact on the thermal parameters. It is also worth mentioning that the introduction of a very small (0.5-1 mol%) Fig.…”

“…Not only the amount of a rare earth element in glass, but also the glass network structure, in particular, the ratio of MnNbOF 5 / BaF 2 , affects the intensity of photoluminescence of a rare earth element. Earlier during the studies of the glass structure in the system MnNbOF 5 -BaF 2 [18], it was found that variations of the glass composition were accompanied by the changes in frequencies of the bands characterizing stretching vibrations of the Nb_O, \O\Nb\O\ and Nb\F bonds in IR Fig. 4.…”

“…The important feature of these glasses consists in the fact that the main component responsible for glass formation is not niobium oxide or fluoride or even NbO 2 F oxyfluoride, but a complex compound MnNbOF 5 . The peculiarities of behavior of thermal parameters of these glasses as well as the information on their structure obtained using the analysis of IR and Raman spectra are presented in [6,7].…”