Preparation and Characterization of New Glassy System As2P2S8-Ga2S3

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• 作者：Silvia H. Santagneli ; Jos&eacute ; Schneider ; Igor Skripachev ; Sidney J. L. Ribeiro ; Younè ; s Messaddeq
• 刊名：Journal of Physical Chemistry B
• 出版年：2008
• 出版时间：April 24, 2008
• 年：2008
• 卷：112
• 期：16
• 页码：4943 - 4947
• 全文大小：139K
• 年卷期：v.112,no.16(April 24, 2008)
• ISSN：1520-5207

文摘

Glasses having the composition (100 - x)As₂P₂S₈-xGa₂S₃ with x ranging from 0 to 50% were investigatedto determine the compositional effect on properties and local structure. The glass transition temperature (T_g)and the stability parameter against crystallization (T_x - T_g) increased with the addition of Ga₂S₃. The structureof these glasses was probed by Raman scattering, Fourier transform infrared (FT-IR) and ³¹P nuclear magneticresonance. On the basis of the observed vibrations and the strength of the ³¹P-³¹P homonuclear magneticdipolar coupling, two scenarios can be proposed for the structural evolution induced by the addition of Ga₂S₃.For x s/entities/le.gif"> 20% we may have the formation of GaS₄E^- groups (E = nonbonding electron), and for x s/entities/ge.gif"> 30% wehave depolymerization of the As₂P₂S₈ units and the formation of a network of GaPS₄ units with each PS_4/2unit (Q⁴) species carrying a single positive formal charge.