ISSN:
1573-4803
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Abstract Oxygen self-diffusion coefficients were measured in a 20K2O-20SrO-60SiO2 (wt%) glass above and below the glass transition temperature using the single spectrum proton activation analysis of oxygen-18 using the nuclear reaction 18O(p, α)15N. The α-particle spectrum recorded during proton irradiation is used to determine the 18O concentration profile. The self-diffusion coefficients, D, determined for the three diffusion times of about 22 h, 3 1/2 and 7 1/2 days were in good agreement within experimental error, except for the two lowest temperatures of the short-time run possibly because of the shallow depths of diffusion and surface exchange. In the temperature range 600 to 1000 K, D values with the relations, above the glass transition temperature D=7.6×1014 exp(−119 kcal/RT) cm2sec−1, and below the glass transition temperature D=1×10−12 exp(−10 kcal/RT) cm2sec−1, were obtained.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00549318
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