The properties of glasses containing small quantities of Na2O were determined. It was found that the Na diffusivity could be described by:

D (cm2/s) = 2.5 x 10-3 exp[-20(kcal/mol)/RT]

For 52ppm of Na2O, and by:

D (cm2/s) = 4.2 x 10-3 exp[-21(kcal/mol)/RT[

For 47ppm of Na2O.

J.F.Cordaro, J.E.Kelly, M.Tomozawa: Physics and Chemistry of Glasses, 1981, 22[4], 90-3

Electrical Conductivity and Tracer Diffusion in Sodium Germanate Glasses. M.P.Thomas, N.L.Peterson: Solid State Ionics, 1984, 14[4], 297-307

Table 102

Diffusion of 22Na in GeO2-Na2O Glasses

 

Na2O (mol%)

Temperature (C)

D (cm2/s)

0.20

302.3

1.61 x 10-11

0.66

302.3

1.11 x 10-11

0.97

302.2

9.20 x 10-12

1.99

302.7

5.96 x 10-12

5.08

302.3

1.90 x 10-12

7.47

302.8

9.47 x 10-13

8.77

302.4

9.03 x 10-13

15.61

302.3

4.57 x 10-12