Photon Energy Becomes the Third Dimension in Crystallographic Texture Analysis. Issue 40 (2nd August 2016)

• Record Type: Journal Article
• Authors: Grünewald, Tilman A.; Rennhofer, Harald; Tack, Pieter; Garrevoet, Jan; Wermeille, Didier; Thompson, Paul; Bras, Wim; Vincze, Laszlo; Lichtenegger, Helga C.
• Is Part Of: Angewandte Chemie international edition. Volume 55:Issue 40(2016)
• Page Start: 12190
• Page End: 12194
• Publication Date: 2016-08-02
• Subjects: biomineralization -- crystallographic texture -- energy-dispersive Laue diffraction -- X-ray diffraction; Chemistry -- Periodicals; 540
• DOI: 10.1002/anie.201603784
• Languages: English
• ISSNs: 1433-7851

Abstract

Abstract: Conventional analysis of the preferred orientation of crystallites (crystallographic texture) involves X‐ray diffraction with area detectors and 2D data output. True 3D, spatially resolved information requires sample rotation in the beam, thus changing the probed volume, which introduces signal smearing and precludes the scanning of complex structures. This obstacle has been overcome by energy‐dispersive Laue diffraction. A method has been devised to reach a large portion of reciprocal space and translate the X‐ray photon energy into the missing third dimension of space. Carbon fibers and lobster exoskeleton as examples of biomineralized tissue have been analyzed. The major potential of this method lies in its "one‐shot" nature and the direct 3D information requiring no previous knowledge of the sample. It allows the texture of large samples with complex substructures to be scanned and opens up the conceptual possibility of following texture changes in situ, for example, during crystallization. Abstract : In full view : A new method to determine crystallographic texture based on energy‐dispersive Laue diffraction exploits the curvature of the Ewald sphere to obtain 3D information in one shot without sample rotation, which opens up unprecedented spatial resolution. The principle was demonstrated on a complex carbon fiber system as well as the biomineralized exocuticle tissue of the American lobster.