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Interpretation of the pair function for laminar amorphous materials in the case of coals. II. Structure of coals
Author(s) -
Grigoriew H.
Publication year - 1988
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s0021889887009907
Subject(s) - petrography , interpretation (philosophy) , amorphous solid , laminar flow , radial distribution function , pair distribution function , mineralogy , function (biology) , materials science , chemistry , crystallography , thermodynamics , physics , computational chemistry , molecular dynamics , quantum mechanics , evolutionary biology , biology , computer science , programming language
From studies on six petrographic components of Polish coals by the radial distribution function method and the interatomic distances calculated from them the proportions of atoms with sp 2 and sp 3 hybridization and the extent of units with sp 3 ‐type structure were determined. From these data and the results of the pair‐function analysis performed in paper I [Grigoriew (1988). J. Appl. Cryst. 21 , 97–101], the model interpretation of the structure of these materials was carried out by matching experimental and model pair functions P ( r ). The model was defined as an average structural unit which scatters X‐rays coherently. It appears that such units in these materials are larger than previously expected and for vitrinites and fuzinites they are in the form of turbostratic layers. The process of formation of stacks of layers was observed in components with the lowest degree of ordering.