Glass Formation and Properties of Chalcogenides in a GeSe2-As2Se3-PbSe System
Résumé
The glass-forming region in a GeSe2-As2Se3-PbSe system was determined, and the dependence of properties on the composition as a formula of 20 GeSe2-(80−x)As2Se3−xPbSe (x=0-30) was investigated. Measurements include density, differential scanning calorimetry, X-ray diffraction, Vis-NIR, and IR transmission spectra. A fairly large glass-forming region was obtained where the higher lead content could be introduced into the system in the As2Se3-rich region than in the GeSe2-rich region. With the introduction of PbSe, the density of glass increased and the calculated molar volume decreased while the crystallization tendency increased, which was indicated by the decreasing ΔT (Tx−Tg). The activation energy of crystallization and the Avrami exponents were also obtained using the modified Ozawa equation. Under proper annealing conditions, suitable IR transmittance glass-ceramics were obtained.