Relationship between composition, crystallization, and phase separation behavior of GeS2–Sb2S3–CsCl chalcogenide glasses

•Transparent chalcogenide glass-ceramic sample embedded CsCl nanocrystals of ~50 nm was obtained.•Phase separation with different droplet and interpenetrating structures were observed in chalcogenide glasses.•Raman spectra of these samples are almost unchanged with the increasing CsCl content.•The network structure of chalcogenide glasses retains acts as a solvent for the dissolution of CsCl.