Jump to main content
Jump to site search

Issue 29, 2009
Previous Article Next Article

Local structure of the B4 phase studied by second harmonic generation and X-ray diffraction measurements

Author affiliations

Abstract

Texture observations, second harmonic generation (SHG) and X-ray diffraction measurements have been carried out in the B4 phase of two classical bent-core liquid crystals. Several sample geometries have been used for the different techniques, including a well-aligned cell for the optical studies. An indexation of the whole diffraction diagram was performed on the basis of a three-dimensional lattice. A quantitative analysis of the X-ray data is also reported. The results are compatible with the well-known twist grain boundary (TGB) structure for the B4 phase. However, within the smectic blocks the structure is monoclinic P2, implying an antiferroelectric in-layer arrangement of the molecules instead of the usually accepted ferroelectric. This antiferroelectric packing also explains the low efficiency of the B4 phase for SHG.

Graphical abstract: Local structure of the B4 phase studied by second harmonic generation and X-ray diffraction measurements

Back to tab navigation

Additions and corrections

Publication details

The article was received on 14 Jan 2009, accepted on 17 Mar 2009 and first published on 21 Apr 2009


Article type: Paper
DOI: 10.1039/B900832B
J. Mater. Chem., 2009,19, 5161-5166

  •   Request permissions

    Local structure of the B4 phase studied by second harmonic generation and X-ray diffraction measurements

    J. Martínez-Perdiguero, I. Alonso, C. L. Folcia, J. Etxebarria and J. Ortega, J. Mater. Chem., 2009, 19, 5161
    DOI: 10.1039/B900832B

Search articles by author

Spotlight

Advertisements