کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1483471 | 991597 | 2007 | 17 صفحه PDF | دانلود رایگان |
Tracer diffusion coefficients of the radioactive isotope Na-22 were measured in glasses of the type (CaO·Al2O3)x(2 SiO2)1−x to study the diffusion of sodium as a function of glass composition, x, temperature and initial water content. The diffusion of Na-22 in glasses diffusion-annealed in dry air can always be well described by a single tracer diffusion coefficient, but sometimes not in samples annealed in common air. It was found that the sodium tracer diffusion coefficient decreases by about six orders of magnitude when the glass composition x changes from 0 to 0.75 at 800 °C. The temperature dependence of the diffusion of sodium seems to decrease as the silica content increases. Variations of the initial water content in some of the glasses investigated did not very significantly influence the rate of the tracer diffusion of sodium.
Journal: Journal of Non-Crystalline Solids - Volume 353, Issue 26, 1 August 2007, Pages 2528–2544