Positron Annihilation Lifetime Spectroscopy Measurement of Ge₅As₃₇S₅₈ Glass

Abstract

Defect configuration of Ge5As37S58 chalcogenide glasses was studied by positron annihilation lifetime spectra (PALS). Size of nanovoids was determined using Liaos formula for radius of nanovoids in spherical approximation. Peculiarities of structural features were obtained from Raman spectra.

Photoluminescence of As2S3 doped by Cr and Yb

“…Chalcogenide glasses can be doped by significant amounts of impurities (up to the level of several atomic percents) without essential changing the optical quality [14]. This feature can be connected with the flexibility of the glass network, lesser density of glass as compared to the crystal, presence of nanovoids (which sizes can be estimated from positron annihilation lifetime spectra using different formula [15,16]). It is necessary to note that introduction of rare earth elements can change not only luminescent but also magnetic properties of chalcogenide glasses.…”