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J. Korean Ceram. Soc. > Volume 34(8); 1997 > Article
Journal of the Korean Ceramic Society 1997;34(8): 870.
$GeS_2-Ga_2S_3-La_2S_3$ 유리 구조 분석을 통한 $La_2S_3$ 용융성 규명
윤중민, 허종, 류선윤1
포항공과대학교 재료금속공학과 비정질무기재료연구실
1선문대학교 재료공학과
Structural Interpretation on the Mechanism of High $La_2S_3$ Solubility in $GeS_2-Ga_2S_3-La_2S_3$Glasses
Ge-Ga-S glasses, contrary to other well-known chalcogenide glasses, show high rare-earth solubility. Raman spectra of GeS2-Ga2S3 glasses showed that two peaks at 260 cm-1 and 385 cm-1 increased in intensity with the addition of Ga2S3. These peaks are associated with the vibration of Ge-Ge bonds and edge-shared [GsS4] tetrahedra, respectively. In GeS2-Ga2S3-La2S3 glasses, the peak at 260 cm-1 decreased in intensity with addition of La2S3 and the one at 375 cm-1 due to the vibration of tetrahedra with non-bridging sulfurs increased. It indicated that La, or rare-earths in general, can easily be dissolved into the glass network as charge compensators for non-bridging sulfurs which were formed through the dissociation of Ge-Ge bonds and edge-shared [GaS4] tetrahedra. Since no such structural modification is expected in glasses as Ga-As-S, these peculiar transitions on the connection scheme in Ga-containing chalcogenide glasses seem to be playing the most important role on the enhanced rare-earth solubility.
Key words: Rare-earth solubility, Raman spectra, Structure, Network modifier, Ga-containing chalcogenide glasses
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