DEHYDRATION OF PHOSPHATE-GLASSES

For several phosphate glass systems composed of K2O, SrO, (La, Nd)2O3 and P2O5, different dehydration methods have been investigated: variat ion of raw materials, addition of halides, sintering of raw material m ixtures, remelting of glasses, variation of melting time, bubbling of dry oxygen. The methods have been compared with each other concerning their effect on decreasing the OH content. Further, a model of the int eractions between glass melt and atmosphere has been established for g lasses prepared using fluoride addition or not.