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Energy-Tunable X-Ray Diffraction in Polycrystalline Materials: a Look at Microstructure in Seashells

Published online by Cambridge University Press:  21 March 2011

Emil Zolotoyabko and
John P. Quintana
Emil Zolotoyabko
Affiliation:
Department of Materials Engineering, Technion-IIT, Haifa 32000, Israel
John P. Quintana
Affiliation:
DND-CAT Research Center, Northwestern University, APS/ANL Sector 5, Building 432 A, 9700 S. Cass Ave., Argonne, IL 60439-4857, U.S.A.
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Abstract

We developed a depth-sensitive x-ray diffraction technique in which diffraction profiles are measured at x-ray energies that are varied by small steps. The method is intended for synchrotron beam lines and provides non-destructive mapping of structural characteristics in inhomogeneous polycrystalline materials. Depth resolution is achieved due to an energy dependence of the x-ray penetration length. Application of this technique to seashells allowed us to extract spatial distributions of preferred orientation and strain components, which revealed pronounced variations of the shell microstructure in three dimensions. The results shed light on “engineering solutions” by mollusk. The developed technique can be used to characterize various laminated structures and composite materials.

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