Study on the Structure of Ge-As-Te Glass by X-ray Diffraction and Reverse Monte Carlo Simulation

The structure of two Ge-As-Te glasses with compositions of Ge10As18Te72 and Ge15As45Te4o were studied by X-ray diffraction radial distribution function analysis and Reverse Monte Carlo simulation. In tile Ge10As18Te72 glass, the Ge, As and Te atoms are bonded on average to 3.55,3 and 0.8 Te atoms, respectively. The structure of the investigated Ge10As18Te72 glass can be described as netwok of distorted GeTe4 tetrahedra and AsTe3 (GeTe3) pyramidal units, connected by- As(Ge)- Te- As(Ge)- chain-like elements; In the Ge15As45Te4o glass, there is one medium-range order dependent X-ary scattering feature, i.e.,the first sharp diffraction peak(FSDP). The Ge atoms are bonded on average to 1.8 Te atoms and 1.1 As atoms. The As atoms are bonded on average to 1.3 Te atoms and 1.0 As atoms. And the length of the Ge -Te bonds and As-Te bonds is shorter in the latter than in the former, respectively.