Vibrational and structural properties of unmodified and radiation-modified chalcogenide glasses for advanced optical applications
2008
Vibrational and structural properties of Ge x Sb 40 x S 60 (x = 25, 27, 35) chalcogeide glasses are studied in unmodified and γ-radiation-modified states by using infrared spectroscopy, high-energy synchrotron x-ray diffraction and extended x-ray
absorption fine structure spectroscopy. An agreement between radiation-induced structural changes and vibrational
properties measured is established. It is suggested that the atomic pairs with wrong coordination created in the
framework of coordination topological defect formation concept play a key role in the formation of radiation-modified
state of the investigated glasses. Advantages and disadvantages of post-technological radiation-modification of
chalcogenide glasses are considered within configuration coordinate model for description of unmodified and radiationmodified
states.
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