Effect of Se on Structure and Electrical Properties of Ge-As-Te Glass

Abstract

The Ge-As-Te glass has a wide infrared transmission window range of 3–18 μm, but its crystallization tendency is severe due to the metallicity of the Te atom, which limits its development in the mid- and far-infrared fields. In this work, the Se element was introduced to stabilize the Ge-As-Te glass. Some glasses with ΔT ≥ 150 °C have excellent thermal stability, indicating these glasses can be prepared in large sizes for industrialization. The Ge-As-Se-Te (GAST) glasses still have a wide infrared transmission window (3–18 μm) and a high linear refractive index (3.2–3.6), indicating that the GAST glass is an ideal material for infrared optics. Raman spectra show that the main structural units for GAST glass are [GeTe4] tetrahedra, [AsTe3] pyramids, and [GeTe4Se4-x] tetrahedra, and with the decrease of Te content (≤50 mol%), As-As and Ge-Ge homopolar bonds appear in the glass due to the non-stoichiometric ratio. The conductivity σ of the studied GAST glasses decreases with the decrease of the Te content. The highest σ value of 1.55 × 10−5 S/cm is obtained in the glass with a high Te content. The activation energy Ea of the glass increases with the decrease of the Te content, indicating that the glass with a high Te content is more sensitive to temperature. This work provides a foundation for widening the application of GAST glass materials in the field of infrared optics.

Structure–property relationships in critically connected (GeTe4)100−x(As2Se3)x glasses

“…46 The vibrations observed at 164 cm −1 and 194 cm −1 may represent As–As and As 4 Se 4 , respectively. 26,47 The 229 cm −1 peak grows and is maximum for x = 100. This shows that the network is mainly composed of As–Se based units in the composition range of 70 ≤ x ≤ 100.…”

“…S6, ESI. † The indirect optical bandgap was determined from the high absorption region (α > 10 cm −1 ) given by eqn (8):…”

“…These glasses find applications in many areas, particularly in phase change memory, infrared transmission, and sensing. 5–8 The high refractive index of chalcogenide glasses made them suitable for host materials for rare earth elements. 9 Many of the properties are determined by the short-range structure.…”

SbI3·3S8: A Novel Promising Inorganic Adducts Crystal for Second Harmonic Generation

“…This application requires a large value of second-order non-linear (i.e creation of light at a second-harmonic frequency) vulnerability and an extended range of optical transparency [ 5 , 6 , 7 ]. The optical nonlinear compound with these characteristic features, which forms a noncentrosymmetric crystal structure in space, is of distinctive attraction [ 8 , 9 , 10 ]. To procure such an NLO crystal structure, the logical constructions of their elemental compositions are crucial.…”

Refractive index improvement of commercial chalcogenide glasses by external doping with Ag and Pb

“…Increasing the refractive index can effectively reduce the thickness of the lens and expand the field of view of the lens. Therefore, it is of great interest to study the improvement of refractive index of commercial ChGs [8][9][10][11][12].…”