Sodium tracer diffusion in glasses of the type (Na 2O) 0.2(B 2O 3) y (SiO 2) 0.8 − y

Sodium tracer diffusion coefficients, D ⁎ Na, have been measured in sodium borosilicate glasses of the type (Na 2O) 0.2(B 2O 3) y (SiO 2) 0.8− y as a function of temperature and the composition parameter y. At constant temperature, the tracer diffusion coefficient of sodium decreases as y increases....

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Bibliographic Details
Published in:Journal of non-crystalline solids 2011-11, Vol.357 (21), p.3661-3669
Main Authors: Wu, Xinwei, Varshneya, Arun K., Dieckmann, Rüdiger
Format: Article
Language:English
Subjects:
Condensed matter: structure, mechanical and thermal properties
Diffusion and transport
Diffusion in solids
Exact sciences and technology
Oxide glasses
Physics
Self-diffusion and ionic conduction in nonmetals
Sodium borosilicate glasses
Transport properties of condensed matter (nonelectronic)
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Summary:Sodium tracer diffusion coefficients, D ⁎ Na, have been measured in sodium borosilicate glasses of the type (Na 2O) 0.2(B 2O 3) y (SiO 2) 0.8− y as a function of temperature and the composition parameter y. At constant temperature, the tracer diffusion coefficient of sodium decreases as y increases. The activation enthalpy derived from sodium tracer diffusion data for temperatures up to about 350 °C increases about linearly with increasing values of y from about 70 to 100 kJ/mol. The pre-exponential factor of the sodium tracer diffusion coefficient as a function of y varies by about one order of magnitude and has a minimum at near y = 0.3. ► Diffusion of Na-22 in sodium borosilicate glasses was studied. ► Composition and temperature dependences of diffusivity were determined. ► Activation energies, pre-exponential factor and Haven-ratio were analyzed.
ISSN:0022-3093
1873-4812
DOI:10.1016/j.jnoncrysol.2011.06.026