“…These studies are of interest because this type of glasses can be used as a basis for functional materials. Thus, one of the targets is to find new compositions of multicomponent fluorine-containing glasses and to study their properties [1][2][3][4][5][6]. Much attention has recently been drawn to fluoride glasses containing bismuth that expands their possible use: refractive index and ionic conductivity increase, and the region of transparency enlarges [7,8].…”