Extended-range structural correlations in amorphous solids
作者： A. Uhlherr , S.R. Elliott
DOI: 10.1016/0022-3093(95)00334-7
关键词: Formalism (philosophy of mathematics) 、 Chemistry 、 Diffraction 、 Molecular physics 、 Structure factor 、 Amorphous solid 、 Mineralogy
摘要: Abstract Extended-range order (ERO), extending beyond 35 A, has been discovered in very large (>10 000 atom) structural models of a-Si. These weak, but quasi-periodic, atomic-density fluctuations have a period R ⋍ 3.4 A , which corresponds to the position first sharp diffraction peak (FSDP) structure factor a-Si at Q 1.9 −1 . In fact, more than half FSDP intensity is associated with ERO for r ≥ 10 Atomic-void-based correlations are as well defined atom distances: equivalently found be chemical-order prepeak Scc(Q) Bhatia-Thornton formalism calculated atom-void packing, thereby supporting void model origin FSDP.
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