| SM ISO690:2012|
PAIUK, Oleksandr; REVUTSKA, L.; STRONSKI, Alexander; GUDYMENKO, A.; GUBANOVA, Antonina; KRYSKOV, Tezarii. Structural properties of chalcogenide glasses As2Se3 doped with manganese. In: Materials Science and Condensed Matter Physics. Editia a 8-a, 12-16 septembrie 2016, Chişinău. Chişinău: Institutul de Fizică Aplicată, 2016, p. 157. ISBN 978-9975-9787-1-2.
|Materials Science and Condensed Matter Physics
Editia a 8-a, 2016
Conferința "International Conference on Materials Science and Condensed Matter Physics" |
8-th Edition, Chişinău, Moldova, 12-16 septembrie 2016
Nanostructured chalcogenide glasses have numerous optical and photonics applications, due to their optical transparency in IR spectral region, chemical stability, high photosensitivity, high linear and non-linear refractive index. These properties can be controlled by doping them with transitional elements. Thus, chalcogenide glasses (ChGs) have great potential for many applications including security screening, pharmaceutical, biological or medical science analysis, information technology and environmental monitoring, etc. On the other hands, ChGs can contribute to the significant technological advancements into suitable THz materials by providing many optical components such as filters, lenses, and waveguides. In present work the results of investigations on the influence of transitional elements doping on structural properties of chalcogenide glasses are presented. As2Se3 glasses doped with manganese (concentration 2 and 5 wt. %) were synthesized by common melt-quenching technique using constituent elements of 6N purity which were melted in vacuum-sealed silica ampoules for 10-12 hours and subsequently quenched in air. The amorphous nature of the samples was verified at room temperature by x-ray diffraction (XRD) technique using ARL X'tra (Thermo scientific) diffractometer equipped with a copper tube (λ = 0,154 nm). The scattering intensities were measured over an angular range of 2≤θ≤140 with a step-size of (θ) = 0.2o and a count time of 5s per step. Room temperature Raman spectra were recorded using Fourier spectrophotometer Bruker IFS-55 Equinox with FRA-106 attachments (measurement resolution – 1cm-1). Nd:YAG laser light at wavelength of 1,06 m was used for excitation. The amorphous nature of the bulk samples was confirmed by absence of sharp peaks in X-ray diffraction pattern. Radial distribution functions (RDF) in doped and undoped bulk glasses were obtained and analyzed. From the RDF data one can see, that the addition of manganese doesn’t significantly affect on the structure of the chalcogenide glasses. The positions of peaks that give information about the radii of the first coordination spheres weren’t changed after Mn introduction. Measured Raman spectra showed bands intensity increasing at 116, 136, 151, 160, 171 cm–1, which is attributed to the vibration of non-stoichiometric molecular fragments containing homopolar AsAs bonds. Intensity of 469 cm-1 band, characteristic for the vibrations Se–Se bonds is decreased with the Mn introduction. In Raman spectra main observed effect under the introduction of dopants was the change of relative concentration of main and non-stoichiometric structural units characteristic for As2Se3 glasses. The research was supported by the FP-7 SECURE-R21 project.