Abstract
The problem of medium-range ordering (MRO) in non-crystalline solids (NCS) is formulated on the basis of local (network) dimensionality ascribed to regions (clusters) not greater then 30 to 50 Å in diameter. We propose therefore to distinguish two MRO processes: The first one is MRO of the 1st kind, i.e. of basic motives/units, the second one is MRO of the 2nd kind, i.e. of clusters. Only the second process gives rise to scattering features in the medium(intermediate)-angle range. In several examples it is shown how it is possible to contribute to a better understanding of MRO by a direct calculation of the intensity of scattered X-rays (neutrons) and-or using 2D-models of nonperiodic structures.
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References
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Červinka, L. On the problem of medium-range ordering in non-crystalline solids. Czech J Phys 35, 1193–1196 (1985). https://doi.org/10.1007/BF01596436
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DOI: https://doi.org/10.1007/BF01596436