Abstract
The influence of sodium fluoride additions on the constitution of sodium metaphosphate glass has been determined by paper chromatographic techniques. Glasses with Na/P ratios varying from 1.5 to 1.22 and melted in air have been studied. It has been found that fluorine is lost from the melt during the normal preparation of glasses. When, however, the melt is quenched immediately after the components have melted into a homogeneous liquid, most of the fluorine is retained. With an increase in the melting time, the amount of fluorine retained by the melt decreases and after about 10 minutes all the fluorine is replaced by oxygen. The constitution of NaPO3‐NaF glasses with the varying Na/P ratios and with melting periods up to 15 minutes has been determined. When the glasses contain a considerable amount of fluorine, there is a breakdown in the structure of phosphate polymers. The results obtained are discussed in relation to the data reported by earlier investigators.
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