The properties of superionic glasses were studied, at temperatures ranging from 24 to 182C, by using complex impedance and radiation absorption methods. It was found that the conductivity ranged from 0.001 to 0.08S/cm. It was noted that the properties depended upon the method of preparation and upon the thermal history of the samples. The conductivities (table 231) and self-diffusion coefficients were related by using the Nernst-Einstein equation. The Haven ratios of between 0.19 and 0.38 (table 232) were suggested to indicate the operation of an interstitialcy mechanism during Ag+ transport.
K.Sebastian, G.H.Frischat: Physics and Chemistry of Glasses, 1992, 33[5], 199-203
Table 231
Conductivity Parameters for AgI-Ag2O-B2O3 Glasses
AgI (mol%) | Ag2O (mol%) | B2O3 (mol%) | σo (S/cm) | Q (kJ/mol) |
39.8 | 29.9 | 30.8 | 25000 | 27.7 |
45.1 | 27.3 | 27.7 | 23000 | 25.4 |
50.1 | 25.2 | 25.3 | 19000 | 23.4 |
54.8 | 22.4 | 22.9 | 13000 | 21.1 |
Table 232
Haven Ratios for AgI-Ag2O-B2O3 Glasses
AgI (mol%) | Ag2O (mol%) | B2O3 (mol%) | Temperature (C) | H |
39.8 | 29.9 | 30.8 | 25 | 0.19 |
45.1 | 27.3 | 27.7 | 25 | 0.22 |
50.1 | 25.2 | 25.3 | 25 | 0.26 |
54.8 | 22.4 | 22.9 | 25 | 0.33 |
39.8 | 29.9 | 30.8 | 75 | 0.21 |
45.1 | 27.3 | 27.7 | 75 | 0.25 |
50.1 | 25.2 | 25.3 | 75 | 0.29 |
54.8 | 22.4 | 22.9 | 75 | 0.36 |
39.8 | 29.9 | 30.8 | 125 | 0.22 |
45.1 | 27.3 | 27.7 | 125 | 0.26 |
50.1 | 25.2 | 25.3 | 125 | 0.31 |
54.8 | 22.4 | 22.9 | 125 | 0.37 |
39.8 | 29.9 | 30.8 | 175 | 0.23 |
45.1 | 27.3 | 27.7 | 175 | 0.27 |