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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 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...