M. Matecki et al., SODIUM FLUOROMETAPHOSPHATE GLASSES WITH HIGH RARE-EARTH ION CONCENTRATIONS, Journal of non-crystalline solids, 184, 1995, pp. 273-277
Vitreous areas in the systems NaPO3-BaF2-REF(3) (RE: rare earth) are g
iven. Particularly stable glass compositions have been found and chara
cterized by determining the characteristic temperatures, refractive in
dex, expansion coefficient and density. The evolution of these physica
l characteristics with the RE ion for the composition 0.60NaPO(3)-0.20
BaF(2)-0.20REF(3) has been examined.