Studies of phosphate melts and glasses. Part I. Fluoride additions to sodium phosphates

JSGT 1959 V43 T308-T324

The effect of structure breakdowns of their polymeric chains on the physical properties of molten sodium phosphates around the meta-composition has been investigated. The structural changes were brought about by the addition of NaF to the molten phosphates. The structural changes have been determined from studies in aqueous solutions of the phosphates. Firstly, the effect of NaF on the hydrolysis of the P–O–P bonds between the polymeric chains in sodium metaphosphate solutions was studied. Then, the alteration in the chain lengths of the phosphates on addition of NaF was determined using a technique due to Van Wazer. The structural changes detected were correlated with density and surface tension measurements and an increase in these two properties was found for a reduction in the phosphate chain lengths.

D. J. Williams, B. T, Bradbury & W. R. Maddocks