Diffraction/scattering computed tomography for three-dimensional characterization of multi-phase crystalline and amorphous materialsThis article forms part of a special issue dedicated to advanced diffraction imaging methods of materials, which will be published as a virtual special issue of the journal in 2013.

Álvarez-Murga, M.; Bleuet, P.; Hodeau, J.-L.

doi:10.1107/S0021889812041039

Figure 2
Multi-modal imaging obtained during a single experiment, simultaneously using absorption, fluorescence and DSCT probes on a sample containing chalcedony (SiO₂, P3₁2₁, a = 4.9134, c = 5.4052 Å) and iron pigments inside a capillary. Absorption images show contrast between areas having different attenuation coefficients, mainly given by Si (Z = 14) and Fe (Z = 26). Fluorescence is sensitive to the general distribution of elemental Fe, whereas DSCT can discriminate between different structural phases with shared elemental Fe, such as haematite (Fe₂O₃, $[R\overline 3c]$ , a = 5.0355, c = 13.747 Å), siderite (FeCO₃, $[R\overline 3c]$ , a = 4.6916, c = 15.379 Å) and greenalite [Fe₃Si₂O₅(OH)₄, monoclinic C2/m, a = 5.390, b = 9.336, c = 14.166 Å, [beta]

= 90.01°] (adapted from Bleuet et al., 2008