Structural correlations in GexSe1-x glasses - a neutron diffraction study

Ramesh Rao, N. ; Krishna, P. S. R. ; Basu, S. ; Dasannacharya, B. A. ; Sangunni, K. S. ; Gopal, E. S. R (1998) Structural correlations in GexSe1-x glasses - a neutron diffraction study Journal of Non Crystalline Solids, 240 (1-3). pp. 221-231. ISSN 0022-3093

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Neutron diffraction measurement is carried out on GexSe1-x glasses, where 0.1≤x≤0.4, in a Q interval of 0.55-13.8 Å-1. The first sharp diffraction peak (FSDP) in the structure factor, S(Q), shows a systematic increase in the intensity and shifts to a lower Q with increasing Ge concentration. The coherence length of FSDP increases with x and becomes maximum for 0.33≤x≤0.4. The Monte-Carlo method, due to Soper, is used to generate S(Q) and also the pair correlation function, g(r). The generated S(Q) is in agreement with the experimental data for all x. Analysis of the first four peaks in the total correlation function, T(r), shows that the short range order in GeSe2 glass is due to Ge(Se½)4 tetrahedra, in agreement with earlier reports. Se-rich glasses contain Se-chains which are cross-linked with Ge(Se½)4 tetrahedra. Ge2(Se½)6 molecular units are the basic structural units in Ge-rich, x=0.4, glass. For x=0.2, 0.33 and 0.4 there is evidence for some of the tetrahedra being in an edge-shared configuration. The number of edge-shared tetrahedra in these glasses increase with increasing Ge content.

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Source:Copyright of this article belongs to Elsevier Science.
ID Code:10168
Deposited On:03 Nov 2010 04:07
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