Research on optical band gap of the novel GeSe2–In2Se3–KI chalcohalide glasses

Effects of samarium (III) oxide content on structural investigations of the samarium–vanadate–tellurate glasses and glass ceramics

“…Consequently, structural modification (crystallization and refractive index change) is induced by increasing of the Sm 2 O 3 content up to 40 mol%, in agreement with XRD data. The additional absorption in the range 360-480 nm can be attributed to other types of defects such as oxygen vacancies (the generation of non-bridging oxygen ions center) [36][37][38]. Accordingly, the number of non-bridging oxygen ions increases indicating the formation of [VO 4 ] orthovanadate structural units, in agreement with IR data.…”

Design and magneto‐optical characteristics of Ge–Sb–S–PbI2 chalcogenide glasses with a high Verdet constant

“…When GeS 2 is substituted by Sb 2 S 3 , the intensity of 314 cm −1 increases while that of 340 cm −1 decreases. 23 In this study, the ΔT decreases with increasing of Sb 2 S 3 , and the values are larger than 100 K when the content of Sb 2 S 3 is between 31.5 and 49.5 mol%. The band of 290 cm −1 is also associated with the stretching vibration of [SbS 3 ] but with the different connection styles compared with the band of 314 cm −1 .…”

“…A criterion ΔT defined as ΔT = T x −T g is generally used for evaluating the stability of a glass during crystallization. 23 In this study, the ΔT decreases with increasing of Sb 2 S 3 , and the values are larger than 100 K when the content of Sb 2 S 3 is between 31.5 and 49.5 mol%. Raman spectra demonstrated that the main structural units are [GeS 4 ] tetrahedra and [SbS 3 ] pyramids in 90((1−x) GeS 2 ·xSb 2 S 3 )·10PbI 2 (x = 0.35, 0.45, 0.55, 0.65, 0.75) glasses, whereas [PbI n ] acts like a network modifier.…”

Structural and optical properties in gadolinium–aluminum–lead-germanate quaternary glasses

“…This could be confirmed by the decreases of the non-bridging oxygen and the formation of Gd 2 Ge 2 O 7 crystalline phase, in agreement with XRD data because the excitation energy is less for a non-bridging than for a bridging oxygen ion. By increasing the Gd 2 O 3 content, the required excitation energy of electronic transition is greater, just showing the short-wave cut-off wavelength shorter [25]. iv) The 4f orbital of Gd + 3 ions is half full and f-f transitions from ground state of 8 S 7/2 to emitting state are located in a short wavelength region less than 300 nm.…”