Abstract

Intensity scattered from fine-crystalline coals is dealt with as a function of crystallite dimensions for disorders of different extent. It turns out from the discussion that types and extents of the disorder are not correctly taken into consideration by intensity relations used generally for the determination of crystallite dimensions. Owing to this fact the crystallite dimensions determined in the usual way are not quite correct. Disorder is taken into account in a suitable manner in our treatment, thus making possible experimental determination of the disorder and — in addition to a more correct determination of crystallite dimensions — helping to a better knowledge of the structure of fine-crystalline coals. We outline the kind of neutron diffraction measurements which should be carried out in order to exploit this possobility.