Vibrational and structural properties of GexSb40 xS60 (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.
The influence of γ-irradiation on optical properties of the pseudobinary "stoichiometric" Sb2S3-GeS2 and the non-stoichiometric Sb2S3-Ge2S3 chalcogenide glasses (ChG) prepared by a standard melt-quenching method is studied. It is established that in the case of the both investigated cut-sections the "γ-darkening" effect (i.e. the "red" shift of the fundamental optical absorption edge), consisting the dynamic (relaxing with time) and the static (remaining constant approximately two months after irradiation) components, takes place. The comparison of compositional trend of the "γ-darkening" effect for the pseudobinary and the non-stoichiometric investigated ChG is made. Phenomenological description of the observed effects is carried out taking the degree of chemical bond metallization, concentration of chemical bonds and free volume parameters into consideration.
The effect of gamma-irradiation on the IR optical properties of the ternary chalcogenide glasses (ChG) of Ge-Sb-S system is investigated. The IR optical transmission spectra in the 4000 - 1000 cm-1 (2.5 - 10 micrometer) region of stoichiometric line (STL) Sb2S3-GeS2 and non- stoichiometric line (NSTL) Sb2S3-Ge2S3 glass compositions are measured. The compositional dependences of intensity of the main impurity absorption bands connected with the existence of oxygen-, hydrogen- and carbon-containing groups in the glass matrix before and after gamma-irradiation are analyzed.
The influence of gamma-irradiation on the optical properties of GexSb40-xS60 chalcogenide glassy system is studied. It is established that long-wave shift of the optical absorption edge or 'gamma-darkening' effect in the investigated glasses depends on their chemical composition or average coordination number Z. The maximum gamma-irradiation effect is observed near the point of Z approximately equals 2.67 and it is absent in Sb-rich ternary bulk samples. The gamma-induced changes of the optical absorption are unstable and restores to some residual value after the period of approximately 2 months. The observed features of the gamma-induced effect are discussed in terms of the compositional dependencies of compactness and fraction of chemical bonds, determined according to the ordered bond network model.
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