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Raman scattering measurement of (1-x)GeS_ 2-x Ga_2S_3 system glasses was conducted in order to understand the microstructural change caused by the addition of Ga_2S_3. According to the change of Raman spectra with the addition of Ga_2S_3, two main structural transformations were deduced: the gradual enhancement of ethane-like structural units S_3Ge-GeS_3(250 cm -1 )and S_3Ga-GaS_3 (270 cm -1 ) and the appearance of charge imbalanced units [Ga_2 S_2(S_ 1/2 )_4] 2- and [Ga(S_ 1/2 )_4]-. And this change of structural aspect seems to give us a clue to understanding the cause of the increased rare-earth solubility.
Raman scattering measurement of (1-x) GeS_ 2-x Ga_2S_3 system glasses was conducted in order to understand the microstructural change caused by addition of Ga_2S_3. According to the change of Raman spectra with the addition of Ga_2S_3, two main structural transformations were deduced: the gradual enhancement of ethane-like structural units S_3Ge-GeS_3 (250 cm -1) and S_3Ga-GaS_3 (270 cm -1) and the appearance of charge imbalanced units [Ga_2 S_2 (S_ 1/2) _4] 2- and [Ga (S_ 1/2) _4] -. And this change of structural aspect seems to give us a clue to understanding the cause of the increased rare-earth solubility.