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Glass formation in the (NH₄)₂NbOF₅-SnF₂ and (NH₄)₂NbOF₅-SbF₃ systems
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DOI：10.1016/j.jnoncrysol.2026.124164.png)
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Abstract
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The novel glasses in the (NH4)2NbOF5-SnF2 and (NH4)2NbOF5-SbF3 systems have been synthesized. The compounds of (NH4)2NbOF5, SnF2 and SbF3 were using in synthesis. Glass transition in the systems synthesized begins in the temperature range of 48–63 °C, glasses crystallize in one stage, the resistance to crystallization of systems with antimony trifluoride is quite high. The structure and ionic mobility of these obtained new glasses were studied. Based on IR spectra analysis it was established that the structural networks of the glasses are formed by oxyfluoroniobate anions united by oxygen bridges. Tin difluoride and antimony trifluoride participate in the formation of a glassy network due to the fluorine atoms in their coordination environment, therefore the emergence and development of dynamic processes in the temperature range of 170 – 420 K, manifested as a narrowing of the 19F NMR spectral line, directly depend on the ratio of these components. The development of diffusion processes with increasing temperature in the fluoride sublattice of glasses containing antimony trifluoride in their composition is interrupted at a temperature of 380 K by the onset of crystallization processes. In glasses in the system with tin difluoride, in the range of investigated temperatures, neither complete averaging of interactions nor a transition of fluoride ions to diffusion in the ionic sublattice occurs.
Keywords:
glass formation
oxyfluoroniobate anions
ionic mobility
SnF₂
SbF₃
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3.5
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