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Theory of X-ray reflection broadening for textures with double-axis averaging: from semicrystalline polymers exhibiting twisted lamellar growth to discotic liquid crystalsстатья
Статья опубликована в высокорейтинговом журнале
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
- Авторы: Luchnikov Valeriy, Anokhin Denis, Cheng Stephen Z.D., Wang Chien-Lung, Bar Georg, Ivanov Dimitri A.
- Журнал: Journal of Applied Crystallography
- Том: 44
- Год издания: 2011
- Издательство: Blackwell Publishing Inc.
- Местоположение издательства: United Kingdom
- Первая страница: 540
- Последняя страница: 544
- DOI: 10.1107/S0021889811014208
- Аннотация: 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 fibers of a typical discotic molecule, trans-diC(60)-Zn porphyrin. Experimentally, these textures can be detected from the characteristic 'comma'-like azimuthal profiles of the non-equatorial diffraction peaks in two-dimensional 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 two-dimensional pattern, without constructing the whole X-ray pole figure.
- Добавил в систему: Анохин Денис Валентинович