Crystallization behavior of 70GeS2–20In2S3–10CsI chalcohalide glass with silver addition

The crystallization behavior of the 70GeS(2)-20In(2)S(3)-10CsI glass introduced with 2 mol% Ag2S system has been studied under non-isothermal condition. The beginning of transmission is shifted toward longer wavelength as a function of annealing temperature. Thermal properties were measured by the differential scanning calorimeter. From the heating rate dependence of crystallization temperature, the activation energy (E (c)) for crystallization and the crystallization rate constant (K) were calculated. The K value of 2.44 x 10(9) for the In2S3 phase is about 28 times larger than the second CP, this is why the controllable crystallization to transparent chalcogenide glass-ceramics with sole In2S3 crystallites can be achieved. By heat treatment with various temperatures, the hardness of the glass enhanced from 204 to 230.8 kg mm(-2), while retained the transmittance of the 8-11 mu m

Enhanced Thermostability, Thermo-Optics, and Thermomechanical Properties of Barium Gallo-Germanium Oxyfluoride Glasses and Glass-Ceramics

International audienceSerial substitutions of BaF2 for BaO in BaO-Ga2O3-GeO2 glasses were performed, and the effects of the substitutions on the glass properties were investigated. The glass transition temperature, density, refractive index, thermo-optics coefficient, and figure of merit for thermal shock decreased with the replacement of oxygen by fluorine. On the other hand, the glass-forming ability increased. Fluorine substitution removed the absorption band of hydroxyl near 2.9 μm. Raman scattering spectroscopy was used to characterize the fluorogermanate glasses. The crystallization process of the glass-ceramics under different heat-treatment conditions was also investigated using differential scanning calorimetry, X-ray diffraction, scanning electron microscopy, and atomic force microscopy. The thermal and mechanical properties were improved by controlling the crystal size of the near- and middle-infrared transparent glass-ceramics