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Characterization of radiation-induced effects in amorphous arsenic sulfides by positron annihilation lifetime spectroscopy

Published online by Cambridge University Press:  27 January 2015

Mykhaylo Shpotyuk*
Affiliation:
Institute of Materials, Scientific Research Company “Carat”, Lviv 79031, Ukraine; and Department of Semiconductor Electronics, Lviv Polytechnic National University, Lviv 79013, Ukraine
Adam Ingram
Affiliation:
Department of Physics, Opole Technical University, Opole 45370, Poland
Oleh Shpotyuk*
Affiliation:
Institute of Materials, Scientific Research Company “Carat”, Lviv 79031, Ukraine; and Institute of Physics, Jan Dlugosz University, Czestochowa 42200, Poland
*
a)Address all correspondence to these authors. e-mail: shpotyukmy@yahoo.com
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Abstract

Positron annihilation lifetime spectroscopy is used to study the structural changes in amorphous arsenic sulfides of a binary As–S system induced by high-energy γ-radiation of 60Co source. It is demonstrated that radiation-induced effects in positron trapping modes of the studied glasses are in strict correlation with shift of their fundamental optical absorption edge. The γ-induced physical aging is shown to be dominated in the rejuvenated S-rich glasses, thermally induced physical aging accompanies annealing of the rejuvenated g-AsxS100−x, while coordination topological defects are character for near-stoichiometric glasses (both annealed and rejuvenated). The competitive processes of free-volume void evolutions such as agglomeration–fragmentation, expansion–contraction, and charging–discharging are considered as possible stages of radiation- and thermally induced structural transformations. The meaningful model for γ-irradiation and relaxation-driven evolution in the void structure of As–S glasses is proposed. The free-volume evolution in g-AsxS100−x associated with thermally and γ-induced physical aging is shown to be consistent with a void fragmentation process, while the formation of γ-induced coordination topological defects leads mainly to void charging.

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Articles
Copyright
Copyright © Materials Research Society 2014 

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Footnotes

Contributing Editor: Joel Ribis

References

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