Properties and microstructure of GeS₂−Ga₂S₃−CdS glasses

Abstract

The samples of the GeS₂−Ga₂S₃−CdS pseudo-ternary glassy system were prepared by conventional melt-quenching techniques. The microstructure of the GeS₂−Ga₂S₃−CdS glasses was analyzed thoroughly using Raman spectra and the relationships among the composition, microstructure and properties (such as thermal properties, densities, optical properties) were probed. The experimental results indicate that the GeS₂ acts as the network former, the Ga₂S₃ as the net intermediate, and the CdS as the net modifier. The GeS₂ and Ga₂S₃ exist in the form of [GeS_4/2], [GaS_4/2] tetrahedra or S₃ Ge(Ga)−(Ga)GeS₃ ethane-like units within the glassy network, and the addition of CdS mainly breaks the Ge(Ga)−(Ga) Ge bonds among the ethane-like units, leading to the formation of [GeS_4/2], [GaS_4/2] tetrahedra. The T_g and T_x have tight relations on the congregated degree of glassy network, however, λ _ris, n and d are hardly involved into the connectional dependence of the space arrangement.

Keywords

chalcogenide glasses / microstructure / property

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