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REVUTSKA, L.; MESHALKIN, Alexei; POPOVYCH, M.; SHPORTKO, Kostiantyn; STRONSKI, Alexander; ACHIMOVA, Elena; KORCHOVYI, Andrii; PAIUK, Oleksandr; GUDYMENKO, A.; GUBANOVA, Antonina. Ag -As -S chalcogenide glasses: properties and applications. In: Materials Science and Condensed Matter Physics. Ediția a 9-a, 25-28 septembrie 2018, Chișinău. Chișinău, Republica Moldova: Institutul de Fizică Aplicată, 2018, p. 291.
|Materials Science and Condensed Matter Physics
Ediția a 9-a, 2018
Conferința "International Conference on Materials Science and Condensed Matter Physics" |
Chișinău, Moldova, 25-28 septembrie 2018
Chalcogenide glasses (CG) are typical representatives of non-oxide glasses. CG are very promising materials for using in optoelectronics as high-speed optical elements, for applications such as data processing devices, electronic switches and optical elements. The aim of this study is to perform the analysis of changes in first coordination sphere, compositional evolution of Raman spectra and study FTIR transmission spectra of the amorphous chalcogenide glasses upon change of the Ag-content. In our study wIn our study w In our study w In our study w In our study wIn our study wIn our study we have chosen group of chalcogenide glasses which includes following Ag-As-S glasses: As40S60, Ag4,7As38S57,3, Ag7,3As37S55,7. The experimental XRD results confirm the amorphous nature of the chalcogenide glass. The calculated radial distribution function of the atoms for As2S3 samples doped with Ag concentration 0%, 10% and 15 wt.% are obtained. The addition of silver does not significantly affect the parameters of first coordination sphere. From obtained Raman spectra of doped As2S3:Ag it can be seen that structure changes. The strong band at 340 cm-1 attributed to the vibrations in AsS3/2 pyramids are dominated. Weak bands located at 187, 221, 231 cm-1 correspond to the presence of the non-stoichiometric molecular fragments of As4S4 nanophase. Tentative Gaussian deconvolution of Raman spectra was performed for analysis of their compositional dependencies. The main effect that is observed at introduction of silver into nanostructured As2S3 glass is the change of the relative concentration of the main and non-stoichiometric molecular structural units that are characteristic for As2S3 glasses. Investigation of influence of Ag on the optical properties of As2S3 glasses was studied in mid-IR region. The observed changes in transmission are considered to be connected with the interaction of the introduced dopants with non-stoichiometric structural elements present in glass and inherent impurities of the host glass such as hydrogen and oxygen. Composite As2S3: Ag/Se nanomultilayered structures were used to study direct surface relief formation. Fabricated grating was studied using AFM microscopy. Relief profile was close to sinusoidal one. Obtained value of grating DE (22%) and AFM data on relief modulation depth h/d (h- relief depth, d grating period) were compared with calculated DE values for such spatial frequency. In this study the results of X-ray diffraction, Raman spectroscopy and FTIR spectroscopy studies for characterization of As2S3 glasses doped by silver are presented. It was shown that Ag doping influences the structural properties of studied chalcogenide glasses. Surface relief holographic diffraction gratings were directly recorded using composite As2S3: Ag/Se nanomultilayered structures. This can be used for the creation of nanocomposites on the base of chalcogenide glasses with new properties, characteristics optimization of registering media on their base, etc.