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Interfacial X-Ray Scattering From Small Surfaces: Adapting Mineral-Fluid Structure Methods for Microcrystalline Materials

Published online by Cambridge University Press:  01 January 2024

Joanne E. Stubbs*
Affiliation:
Center for Advanced Radiation Sources, The University of Chicago, Chicago, IL, USA
Anna K. Wanhala
Affiliation:
Center for Advanced Radiation Sources, The University of Chicago, Chicago, IL, USA
Peter J. Eng
Affiliation:
Center for Advanced Radiation Sources, The University of Chicago, Chicago, IL, USA James Franck Institute, The University of Chicago, Chicago, IL, USA
*
*E-mail address of corresponding author: stubbs@cars.uchicago.edu

Abstract

Crystal truncation rod (CTR) X-ray diffraction is an invaluable tool for measuring mineral surface and adsorbate structures, and has been applied to several environmentally and geochemically important systems. Traditionally, the method has been restricted to single crystals with lateral dimensions >3 mm. Minerals that meet this size criterion represent a minute fraction of those that are relevant to interfacial geochemistry questions, however. Crystal screening, data collection, and CTR measurement methods have been developed for crystals of <0.3 mm in lateral size using the manganese oxide mineral chalcophanite (ZnMn3O7·3H2O) as a case study. This work demonstrates the feasibility of applying the CTR technique to previously inaccessible surfaces, opening up a large suite of candidate substrates for future study.

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Type
Article
Copyright
Copyright © Clay Minerals Society 2021

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