| Sodium~ Silver lnterdiffusion Studies in the
Glass System Na20-B20a-Bi20a-Si02 |
D. CHAKRAVORTY AND B. K. D.P. RAO
Pages : 31-38
DOI : 10.1080/0371750X.1976.10840851 |
| Abstract |
| Sodium ~ Silver interdiffusion coefficients in the temperature
range 275° to 375cC have been measured for glasses
in the system Na20-B20 3-Bi20 3-Si02 by electron probe
microanalysis. The interdiffusion coefficients are found to be
dependent on silver concentration. By analysing the data
on the basis ofHelfferichs interdiffusion formula, values of
self-diffusion coefficients for sodium and silver have been
estimated. The activation energies for these diffusion
coefficients lie in the range 0.2 eV-1.4 eV. An increase of
the alkali content in glasses containing bismuth oxide
increases lhe activation energy for silver self-diffusion
coefficient relative to that of sodium. A possible explanation
is given in terms of a two-phase structure model of these
glasses. |
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