Liquation of Vycor Glasses - Study by Positron Annihilation Lifetime Method

• Authors: B. Jasińska , A. Dawidowicz , S. Radkiewicz
• Languages of publication: EN

Abstracts

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.

Keywords

EN

78.70.Bj; 61.43.Gt

Discipline

• 78.70.Bj: Positron annihilation(for positron states, see 71.60.+z in electronic structure of bulk materials; for positronium chemistry, see 82.30.Gg in physical chemistry and chemical physics)
• 61.43.Gt: Powders, porous materials

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2001
• Volume: 99
• Issue: 3-4
• Pages: 379-384

Dates

published

2001-03/04

received

2000-09-18

Contributors

author

B. Jasińska

• Institute of Physics, Maria Curie-Skłodowska University, Pl. M. Curie-Skłodowskiej 1, 20-031 Lublin, Poland

author

A. Dawidowicz

• Department of Chemical Physics, Faculty of Chemistry, Maria Curie-Skłodowska University, Pl. M. Curie-Skłodowskiej 3, 20-031 Lublin, Poland

author

S. Radkiewicz

• Department of Chemical Physics, Faculty of Chemistry, Maria Curie-Skłodowska University, Pl. M. Curie-Skłodowskiej 3, 20-031 Lublin, Poland

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Identifiers

DOI

10.12693/APhysPolA.99.379