Synthesis and characterization of bismuth-containing oxyfluoroniobate glasses

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

“…Bismuth trifluoride forms its own polyhedra at a concentration above 10 mol%. As was shown in [12,13], fluorobismuth groups are not incorporated into the oxyfluoroniobate network, but form their own clusters or layers. Fig.…”

“…1 shows the Raman spectra of glasses in the system of MnNbOF 5 -BaF 2 -5BiF 3 (normalized on peak intensity at 900 cm − 1 ). Except for the spectrum of the glass 25MnNbOF5-70BaF 2 -5BiF 3 , the spectra of the glasses under study are, in general, analogous to spectra of similar systems, in which the amount of bismuth trifluoride is larger than 10% [12]. The IR spectra of glasses in the MnNbOF 5-BaF 2 -5BiF 3 system did not undergo significant changes after introduction of 1-0.5 mol% of ErF 3 (Fig.…”

“…The glass structure in the MnNbOF 5 -BaF 2 -BiF 3 system was investigated earlier using the IR and Raman spectroscopy methods [12,13]. As was revealed by the comparison of the obtained spectra with those of crystalline oxyfluoroniobates and earlier studied systems of NbO 2 FBaF 2 [15] and MnNbOF 5 -BaF 2 , the glass network is built from oxyfluoroniobate polyhedra linked through oxygen bridges.…”

“…We demonstrated the possibility of introduction of bismuth trifluoride into systems on the basis of MnNbOF 5 [11]. The results of studying of the structure and thermal parameters, including the crystallization process, of glasses in the system MnNbOF 5 -BiF 3 -BaF 2 are described in [12,13]. The present work reports the results of studies of glasses in the MnNbOF 5 -BaF 2 -BiF 3 system doped with ErF 3 .…”