Analysis of the shape of x-ray diffraction peaks originating from the hexatic phase of liquid crystal films. (13th April 2017)

• Record Type: Journal Article
• Authors: Zaluzhnyy, I. A.; Kurta, R. P.; Menushenkov, A. P.; Ostrovskii, B. I.; Vartanyants, I. A.
• Is Part Of: Molecular crystals and liquid crystals. Volume 647(2017)
• Page Start: 169
• Page End: 178
• Publication Date: 2017-04-13
• Subjects: Liquid crystals -- hexatic phase -- bond-orientational order -- smectic-A-hexatic-B phase transition -- x-ray diffraction; Molecular crystals -- Periodicals; Liquid crystals -- Periodicals; Liquid crystals; Molecular crystals; Periodicals; 548
• DOI: 10.1080/15421406.2017.1289582
• Languages: English
• ISSNs: 1542-1406

Abstract

ABSTRACT: X-ray diffraction studies of the bond-orientational order in the hexatic-B phase of 75OBC and 3(10)OBC compounds are presented. The temperature evolution of an angular profile of a single diffraction peak is analyzed. Close to the hexatic-B–smectic-A transition these profiles can be approximated by the Gaussian function. At lower temperatures in the hexatic-B phase the profiles are better fitted by the Voigt function. Theoretical analysis of the width of diffraction peaks in three-dimentional (3D) hexatics is performed on the basis of the effective Hamiltonian introduced by Aharony and Kardar[1] . Theoretical estimations are in good agreement with the results of x-ray experiments.