2005
DOI: 10.12693/aphyspola.107.832
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Modified Positron Annihilation Model for Glassy-Like As2Se3

Abstract: An approach to structural characterization of chalcogenide glasses based on the study of void distribution is discussed. The results of positron annihilation lifetime spectra measurements for glassy-like g-As2Se3 are compared with nano-void distribution data obtained from Monte Carlo simulation. In this consideration perspectives to involve the parameters of nano-voids calculated from the first sharp diffraction peak in the framework of known Elliott's model are analyzed.

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“…Open volume with larger size will have longer lifetime of trapped positrons because of the lower electron density [7,8]. Secondly, it is well known that the negatively charged CD generally exist in all of the known binary chalcogenide glasses system [15,16]. Furthermore, on the basis of numerous experimental data for the various chalcogenide glass systems, it was assumed that the main types of these CD were characterized by the following lifetimes -0.32 ns (s À 1 ) and 0.42 ns (Ge À 3 ) [16].…”
Section: Discussionmentioning
confidence: 99%
“…Open volume with larger size will have longer lifetime of trapped positrons because of the lower electron density [7,8]. Secondly, it is well known that the negatively charged CD generally exist in all of the known binary chalcogenide glasses system [15,16]. Furthermore, on the basis of numerous experimental data for the various chalcogenide glass systems, it was assumed that the main types of these CD were characterized by the following lifetimes -0.32 ns (s À 1 ) and 0.42 ns (Ge À 3 ) [16].…”
Section: Discussionmentioning
confidence: 99%