Oxygen self-diffusion in a potassium strontium silicate glass using proton activation analysis |
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Authors: | B S Rawal A R Cooper |
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Affiliation: | (1) Division of Metallurgy and Materials Science, Case Western Reserve University, 44106 Cleveland, Ohio, USA;(2) Present address: AVX Ceramics Corporation, 29577 Myrtle Beach, South Carolina, USA |
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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, )15N. The -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. |
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