Pore size determination in Vycor glass

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• 作者：Jasinska ; B. ; Dawidowicz ; A.L.
• 关键词：Positron annihilation ; Pore formation ; Positronium ; Glass
• 刊名：Radiation Physics and Chemistry
• 出版年：2003
• 期刊代码：68_0969806x
• 类别：ph
• 出版时间：October - November, 2003
• 卷：68
• 期：3-4
• 页码：531-534
• 文件大小：103 K

摘要

Pore formation in Vycor glass subjected to annealing at 530°C and 550°C for different periods of time ranging from 4 to 48h was studied. The o-Ps lifetime in such a medium was in the range 60–100ns, while the intensity of this component varied from 20%to 28%. The values of pore radii extracted from PALS data agreed well with those from other porosimetric methods if ΔR applied in cylindrical model calculations was about 0.18nm.