Raman spectroscopic analysis on the solubility mechanism of La3+ in GeS2-Ca2S3 glasses
SCIE
SCOPUS
- Title
- Raman spectroscopic analysis on the solubility mechanism of La3+ in GeS2-Ca2S3 glasses
- Authors
- Heo, J; Yoon, JM; Ryou, SY
- Date Issued
- 1998-09
- Publisher
- ELSEVIER SCIENCE BV
- Abstract
- In comparison to other chalcogenide glasses, Ge-Ga-S glasses have the largest rare-earth solubility. Raman spectra of GeS2-Ga2S3 glasses contain two bands at 265 and 385 cm(-1) which increased in intensity with the addition of Ga2S3. These are associated with the vibration of Ge-Ge bonds and edge-shared GaS4 tetrahedra, respectively. Upon the addition of La2S3 into GeS2-Ga2S3 glasses, intensities of these two bands decreased while a new band appeared at 375 cm(-1) due to the vibration of tetrahedra with non-bridging sulfur(s). Dissociation of Ge-Ge bonds and edge-shared GaS4 tetrahedra through the addition of La2S3 are responsible for the non-bridging sulfur formation. La3+ can be dissolved into the glass network as charge compensators for these non-bridging sulfurs. Since no such structural unit is present in glasses without Ga2S3, this connection scheme and the structural modification in Ga-containing chalcogenide glasses seem to be crucial for an increase of La3+ solubility. (C) 1998 Elsevier Science B.V. All rights reserved.
- Keywords
- RARE-EARTH SULFIDE; GE-S GLASSES; VIBRATIONAL-SPECTRA; STRUCTURAL APPROACH; ABSORPTION; SYSTEM
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/20654
- DOI
- 10.1016/S0022-3093(98)00577-8
- ISSN
- 0022-3093
- Article Type
- Article
- Citation
- JOURNAL OF NON-CRYSTALLINE SOLIDS, vol. 238, no. 1-2, page. 115 - 123, 1998-09
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