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Liquation of Vycor Glasses - Study by Positron Annihilation Lifetime Method

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Jasińska B., Dawidowicz A., Radkiewicz S.
Acta Physica Polonica A
|
2001
|
vol. 99
|
issue 3-4
379-384
EN
Two Vycor glasses of different percentages of the components were liquated between 725 K and 950 K and leached in order to produce pores. Little intermolecular voids characterized by ortho-positronium lifetime valueτ_2≈1.5 ns were observed simultaneously. At the first stage of pore formation the intensity I_2 decreased considerably for both glasses, while at liquation temperatures higher than 825 K it increased again. The increase in I_2 resulted from changes in the properties of the bulk material. The growth ofτ_2 in this range of temperatures was also observed.
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