| Glass formation region, thermal stability and chemical
durability have been determined in the four component
glassy YF3-PbF1-CdF1-AIF3 (YPCA) system. The notable
features of these glasses are thermal stability at llOoC, IR
transmission of - 80% with long wavelength cut-off at
9.5 ~m and excellent chemical stability. These features are
superior to zirconium fluoride glasses conventionally used
as infrared materials. An important characteristic of the
glass, i.e. water durability has been studied using three
different techniques, namely static dissolution test,
monitoring water absorption peak in the IR spectrum with
dipping time and by analysis of the leached solution. The
results from all the three methods complement each other
and the glasses show excellent resistance to water attack at
ambient temperature. YPCA glasses, therefore, appear as
promising candidates for infrared related applications. |
