Structural evolution study of additions of Sb_2S_3 and CdS into GeS_2 chalcogenide glass by Raman spectroscopy |
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| Affiliation: | 1. Jiangsu Key Laboratory of Advanced Laser Materials and Devices, School of Physics and Electronic Engineering, Jiangsu Normal University, Xuzhou 221116, China;
2. State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences(CAS), Xi'an 710119, China;
3. State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, China |
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| Abstract: | The structures of pseudo-binary GeS2-Sb2S3, GeS2-CdS, Sb2S3-CdS, and pseudo-ternary GeS2-Sb2S3-CdS chalcogenide systems are systematically investigated by Raman spectroscopy. It is shown that a small number ofS3Ge-GeS3] structural units (SUs) and -S-S-/S8 groups exist simultaneously in GeS2 glass which has a three-dimensional continuous network backbone consisting of cross-linked corner-sharing and edge-sharingGeS4] tetrahedra. When Sb2S3 is added into GeS2 glass, the network backbone becomes interconnectedGeS4] tetrahedra andSbS3] pyramids. Moreover, Ge atoms inS3Ge-GeS3] SUs tend to capture S atoms from Sb2S3, leading to the formation ofS2Sb-SbS2] SUs. When CdS is added into GeS2 glass,Cd4GeS6] polyhedra are formed, resulting in a strong crystallization tendency. In addition, Ge atoms inS3Ge-GeS3] SUs tend to capture S atoms from CdS, resulting in the dissolution of Ge-Ge bond. Co-melting of Sb2S3 or CdS with GeS2 reduces the viscosity of the melt and improves the homogeneity of the glass. The GeS2 glass can only dissolve up to 10-mol% CdS without crystallization. In comparison, GeS2-Sb2S3 glasses can dissolve up to 20-mol% CdS, implying that Sb2S3 could delay the construction ofCd4GeS6] polyhedron and increase the dissolving amount of CdS in the glass. |
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| Keywords: | chalcogenide glass Raman spectroscopy structure Ge-Sb-Cd-S system |
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