Glass formation and properties of glasses based on Ga2S3–Sb2S3 systems incorporated with CsX (X = Cl, Br, I) and AgCl

• Published in: Journal of the Ceramic Society of Japan 2018/06/01, Vol.126(6), pp.452-461
• Main Authors: ASHIDA, Tomoyo, OKADA, Arifumi, WAKASUGI, Takashi, KADONO, Kohei
• Format: Article
• Language: English
• Subjects: Atmospheric windows; Chalcogenide glass; Chalcohalide glass; Crystallization; Gallium sesquisulfide; Glass formation; Glass transition temperature; Infrared transmitting materials; Micrometers; Morphology; Non-oxide glass; Optical materials; Silver chloride; Sulfide glass; Temperature; Temperature gradients
• ISSN: 1882-0743; 1348-6535
• DOI: 10.2109/jcersj2.18014

Glass formation was investigated for the Ga2S3–Sb2S3–CsX (X = Cl, Br, I) and Ga2S3–Sb2S3–AgCl systems. Glasses were obtained for the compositional regions that contain the parts of the lines from the eutectic point of the Ga2S3–Sb2S3 system (20GaS3/2·80SbS3/2) to the midpoint of the GaS3/2–CsX system (50GaS3/2·50CsX), extending to both sides of the lines. The glass transition temperatures were in the range of 210 to 280°C and tended to decrease with increases of the Sb2S3 and CsX contents. Some glasses in these systems had a temperature difference between crystallization and a glass transition of more than 200 K. The infrared transmission limits were located at approximately 14 µm, and the transmission range covered the atmospheric windows. These facts indicate that the glasses are suitable for use as optical materials in infrared optics. Furthermore, the absorption edges at the short wavelength side were blue-shifted, reaching the visible region with the incorporation of CsX. However, glasses in some compositional domains showed inhomogeneous structures in their matrices. Particularly, a unique morphology was observed the inhomogeneous CsCl-incorporated glasses, in which many voids of several micrometers in size were formed. The crystallization behaviors at the borders of the glass forming regions are discussed.