Se improved far-infrared te-based chalcogenide glass
Résumé
Se with good glass formation ability was gradually doped into the Ge-As-Te glasses, and then the gradual change processes of some key physical and optical properties were observed. A series of Ge10As40Te50-xSex(x=0, 10, 20, 30, 40, 50) chalcogenide glass samples were prepared by the traditional melt-quenching method. The internal microstructure, physical and chemical properties of the glass samples were analyzed by using X-ray diffraction, Raman spectroscopy and thermal dilatometer instruments. Vis-NIR absorption spectra and infrared optical transmission spectra of these glasses were recorded with Spectrophotometer and Fourier transform infrared spectroscopy instrument. Then, the Tauc equation was adopted to calculate the direct and indirect optical band gaps of the glass samples. The results show that with the increasing of the Se, the thermal stability can be effectively improved, the maximum Tg can reach up to 233℃. A obvious blue shift of short infrared absorption spectrum cut-off edge appearance is observed in these glasses, i.e. The optical band gap increases gradually, which shows a wider range of transmission and better transparency spectrum, the maximum transmission rate can reach up to 56%. Infrared cut-off edge remains at 20μm, while Se content is less than 2 mol, its thermal stability is improved obviously and the optical spectral changes little. At last, using metal Mg as an oxide redactor for the purification of these glasses, the results show that the transmission spectra is much smooth and without any obvious impurity absorption peaks after the appropriate purification process. © 2016, Science Press. All right reserved.
Mots clés
Absorption spectroscopy
Chalcogenides
X ray diffraction
Thermodynamic stability
Tellurium compounds
Far infrared
Cutoff wavelengths
Chemical analysis
Electromagnetic wave absorption
Energy gap
Fourier transform infrared spectroscopy
Germanium
Glass
Light absorption
Light transmission
Optical band gaps
Optical properties
Purification
Glass formation ability
Internal microstructure
Optical transmission spectrum
Physical and chemical properties
Te-based chalcogenide glass
Transmission spectrums
Selenium compounds