Internal friction of NaPO3 glasses containing water

TLDR: In this paper, the internal friction of sodium metaphosphate glasses containing from 0.016 to 0.330 wt% water has been investigated and a mechanism consisting of the cooperative motion of sodium ions and protons has been proposed for this peak.

Abstract: The internal friction of sodium metaphosphate glasses containing from 0.016 to 0.330 wt% water has been investigated. Weight loss and infrared absorption measurements were used to determine the water content. Of the two internal friction peaks observed between −100°C and ∼250°C, the second peak occurring above room temperature has a pronounced dependence upon the water content; increasing water content causing the activation energy to decrease as the peak increased in size. A mechanism consisting of the cooperative motion of sodium ions and protons has been proposed for this peak. It is concluded that the second peak in the NaPO 3 glasses and the similar peak in alkali silicate glasses is not associated with the movement of the non-bridging oxygen ions.