Abstract
The electrical properties of glasses in the Na 2OP 2O 5, Ag 2OP 2O 5 and (1− x)Na 2O xAg 2OP 2O 5 systems have been measured over a range of temperature and composition. The properties of the Na 2OP 2O 5 and Ag 2OP 2O 5 glasses have been compared within the phosphate system as well as with silicate glasses. The silver-containing glasses show higher conductivity and lower temperature coefficients when compared with the sodium-containing glasses. A maximum in the room temperature resistivity of the (1− x)Na 2O− xAg 2O−P 2O 5 system was found around the mole ratio of 0.16:0.84 Ag 2O:Na 2O, indicating a mixed-alkali effect. A similar effect was seen in the tan δ, but not in the T g-against-composition plots. A linear relationship was noted for the tan δ-versus-log 10 (resistivity) plot, as has been seen in other glass-forming systems.
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