LIQUATION OF VYCOR GLASSES - STUDY BY POSITRON ANNIHILATION LIFETIME METHOD |
| B. Jasińskaa, A.L. Dawidowiczb and S. Radkiewiczb aInstitute of Physics, Maria Curie-Skłodowska University Pl. M. Curie-Skłodowskiej 1, 20-031 Lublin, Poland bDepartment of Chemical Physics, Faculty of Chemistry Maria Curie-Skłodowska University Pl. M. Curie-Skłodowskiej 3, 20-031 Lublin, Poland |
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| 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 value τ2~1.5 ns were observed simultaneously. At the first stage of pore formation the intensity I2 decreased considerably for both glasses, while at liquation temperatures higher than 825 K it increased again. The increase in I2 resulted from changes in the properties of the bulk material. The growth of τ2 in this range of temperatures was also observed. |
| DOI: 10.12693/APhysPolA.99.379 PACS numbers: 78.70.Bj, 61.43.Gt |