Characterization and structural aspects of fluorophosphate glasses

Abstract

Nine homologous series of fluorine phosphate and one series of pure phosphate glasses of laser glass types have been prepared and characterized by determining the linear and non-linear refractive values and dispersion, the glass transition temperature Tg, thermal expansion (TE), density ϱ, and anion mole volumina (MV). The results are discussed with respect to structural aspects. Apart from principal differences in the absolute properties and structure, an analogous behaviour is found for the cations in the fluorine phosphate glasses compared with pure phosphate glasses. The specific structural influence of the cations (Na+, Mg2+, Ba2+, Al3+, P5+, V5+) is generally larger than that of the fluoride ions at ratios F/O from 0,9 to 1,8, indicating that fluorine has not only network modifying but also remarkable network forming qualities.