PROCEEDINGS OF THE RUSSIAN HIGHER SCHOOL
ACADEMY OF SCIENCES

Abstract
It is shown that textures with double-axis averaging similar to the a-texture, or Keller–

Machin Type I texture, are not specific to semicrystalline polymers exhibiting twisted lamellar growth. In this work, such texture is observed in extruded fibres of a typical discotic molecule, trans-diC60-Zn porphyrin. Experimentally, these textures can be detected from the characteristic

‘comma’-like azimuthal profiles of the non-equatorial diffraction peaks in twodimensional X-ray patterns. Analytical expressions for the azimuthal intensity distribution are developed, which are in good agreement with the experiment. In the proposed generalized coordinates, the diffraction peak shape becomes universal. This provides a simple means of checking the closeness of the sample morphology to the a-texture from just one twodimensional

pattern, without constructing the whole X-ray pole figure.

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