TY  - JOUR
AU  - Stronski, A.
AU  - Kavetskyy, T.
AU  - Revutska, L.
AU  - Shportko, K.
AU  - Popovych, M.
AU  - Kaban, I.
AU  - Jóvári, P.
TI  - Structural order in (As<sub>2</sub>S<sub>3</sub>)x(GeS<sub>2</sub>)<sub>1−x</sub> glasses
JO  - Journal of non-crystalline solids
VL  - 572
SN  - 0022-3093
CY  - Amsterdam [u.a.]
PB  - Elsevier Science
M1  - PUBDB-2021-03959
SP  - 121075
PY  - 2021
N1  - Waiting for fulltext
AB  - Structural order in the chalcogenide glasses of (As<sub>2</sub>S<sub>3</sub>)<sub>x</sub>(GeS<sub>2</sub>)<sub>1−x</sub> (x = 0.0, 0.1, 0.2, 0.4, 0.6, 0.8, 1.0) system is examined in terms of the parameters of local atomic structure as a function of composition x, obtained using high-resolution Raman spectroscopy, high-energy synchrotron X-ray diffraction, extended X-ray absorption fine structure spectroscopy and reverse Monte-Carlo modeling of diffraction data. As a result of the research carried out it is revealed that the structural order of As-rich (x > 0.4) and Ge-rich (x < 0.4) glasses is organized by the main As−S and Ge−S structural motifs based on pyramidal AsS<sub>3</sub> and tetrahedral GeS<sub>4</sub> units linked by =As−S−As= and triple bondGe−S−Getriple bond structural configurations, respectively; while for the intermediate compound with x = 0.4 the structural network seems to be better homogeneous on the nanoscale due to appearance of triple bondGe−S−As= mixed structural configurations resulting in misbalance between corner-shared and edge-shared tetrahedral units in comparison with their predicted ratio for binary GeS<sub>2</sub> glass and the structure of this alloy is similar to the structure of the stoichiometric glass Ge<sub>18.2</sub>As<sub>18.2</sub>S<sub>63.6</sub> (i.e., x = 0.455) consisting of a coner-shared network of homogeneously mixed GeS<sub>4</sub> tetrahedra and AsS<sub>3</sub> pyramids. Based on the structural studies, it is also established that the balance between corner-shared and edge-shared GeS<sub>4</sub> tetrahedra in the glass backbone of the investigated GeS<sub>2</sub>-based glasses seems to be responsible for the interconnectivity between two speculative Raman modes at 370 and 430 cm<sup>−1</sup>. Compositional changes in studied glasses result in the evolution of the observed Raman bands. Such dependences of characteristic constituent Raman bands’ intensities showed that (As<sub>2</sub>S<sub>3</sub>)<sub>x</sub>(GeS<sub>2</sub>)<sub>1−x</sub> samples contain different nanophases whose concentration is changing along chosen compositional cross-section.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000694765600001
DO  - DOI:10.1016/j.jnoncrysol.2021.121075
UR  - https://bib-pubdb1.desy.de/record/465571
ER  -