Preparation and characterization of glasses in the Ag2S+B2S3+GeS2 system

Compositional dependence of the nonlinear refractive index of new germanium-based chalcogenide glasses

“…The Raman spectra of the glasses present a broad main band in the range of 300-425 cm À1 with bands of low amplitude in the 450-550 cm À1 range. In agreement with previous studies in the same ternary composition space, the bands at 330 and 340 cm À1 correspond to the A 1 mode of isolated GeS 4 [29] and corner-sharing GeS 4/2 [30] tetrahedral units, respectively. The shoulder at higher wavenumbers is composed of three bands near 375, 410, and 425 cm À1 .…”

“…The shoulder at higher wavenumbers is composed of three bands near 375, 410, and 425 cm À1 . The bands near 375 and 410 cm À1 have been attributed, respectively, to the T 2 mode of edge-sharing Ge 2 S 4 S 4/2 bi-tetrahedra and the T 2 mode of corner-sharing GeS 4/2 while the band at 425 cm À1 is related to vibrations of two tetrahedra connected through one bridging sulfur atom, as in S 3 Ge-S-GeS 3 [30]. The shoulder at around 300 cm À1 has been assigned to the E modes of SbS 3/2 pyramids [31].…”

Effect of the substitution of S for Se on the structure and non-linear optical properties of the glasses in the system Ge0.18Ga0.05Sb0.07S0.70−xSex

“…The shoulder at around 300 cm À1 has been assigned to the E modes of SbS 3/2 pyramids. In accordance with Mei et al, the bands at 330 and 400 cm À1 have been assigned to the A 1 and T 2 modes of corner-sharing GeS 4/2 groups [21]. The bands at 340, 370 and 420 cm À1 have been attributed, respectively to A 1 mode of the GeS 4 molecular units [22], to the T 2 mode of two edge-sharing Ge 2 S 4 S 2/2 tetrahedra and to the vibration of two tetrahedral connected through a bridging sulfur S 3 Ge-S-GeS 3 [21].…”

“…In accordance with Mei et al, the bands at 330 and 400 cm À1 have been assigned to the A 1 and T 2 modes of corner-sharing GeS 4/2 groups [21]. The bands at 340, 370 and 420 cm À1 have been attributed, respectively to A 1 mode of the GeS 4 molecular units [22], to the T 2 mode of two edge-sharing Ge 2 S 4 S 2/2 tetrahedra and to the vibration of two tetrahedral connected through a bridging sulfur S 3 Ge-S-GeS 3 [21]. In accordance with previous studies [14,20,23], the Ga-S vibrations are hidden in more intensive bands of vibrations of Ge-S structural units due to close values of atomic weights of Ge and Ga (72.59 and 69.72 respectively).…”

Structure and physical properties of Ge15Sb20Se65‐xSx glasses

“…The Se chains or rings have a Raman peak at around 255 cm −1 . Regarding S‐based structural units, GeS 4/2 tetrahedral vibration modes are at 344 cm −1 and 395 cm −1 , the pyramidal SbS 3/2 structural units have the peaks at 280 cm −1 and 308 cm −1 , and the S chains or rings have a vibration around 475 cm −1 …”