(width) x 640 (length) x 420 (height) nm. The 3D BCDI reconstructions3 MODELING, METHODOLOGY demonstrate that the reconstructed Bragg electron density and strain AND INSTRUMENTATION fields are essentially the same for the two scanning modes. For the SYNCHROTRON SOLEIL HIGHLIGHTS 2020 retrieved strain component, red corresponds to positive/tensile strain, while blue corresponds to negative/compressive strain. Interestingly, edges and facets of the crystal display opposite strain. SIXS BEAMLINE FIGURE 2 FIGURE 3 Associated publication Continuous scanning for Bragg coherent X-ray imaging. N. Li, M. Dupraz, L. Wu, S. J. Leake, A. Resta, J. Carnis, S. Labat, E. Almog, E. Rabkin, V. Favre-Nicolin, F. E. Picca, F. Berenguer, R. van de Poll, J. P. Hofmann, A. Vlad, O. Thomas, Y. Garreau, A. Coati & M.-I. Richard. Scientific Reports, 10: art.n° 12760 (2020). References [1] J. Miao etal. , Nature 400, 342 (1999). [2] I . Robinson & R. Harder, Nat Mater, 8, 291 (2009). [3] J. Carnis et al., Sci Rep 9, 17357 (2019). We then compared quantitatively the strain along the [111] direction. Figure Corresponding author 3 displays the reconstructed strain for Marie-Ingrid Richard the step-by-step (a-b) and continuous Univ. Grenoble Alpes, (c-d) scans. The strain retrieved by CEA Grenoble, IRIG, MEM, NRS, the two methods are in very good 17 avenue des Martyrs, agreement. In Figures 3(a) and (c), 38000 Grenoble, France localised strain is observed at the crystal/ mrichard@esrf.fr substrate interface; it may arise from a dislocation network at the interface. Captions Histograms of the e111strain for both FIGURE 1: Sum along the rocking direction of all the methods are displayed in Figure 3(g). detector images acquired in the vicinity of the 111 Ptreflection during (a) step-by-step and (b) continuous The two histograms are almost superimposed. The histogram shown in scanning for the same Pt particle. Figure 3(h) illustrates the dispersion of the differences in the reconstructed strain values and follows a Gaussian behaviour. The standard deviation FIGURE 2: Bottom (a, b), side (c, d) and top (e, f) is 6x10, which is within the accuracy of the technique [3]. views of the BCDI reconstruction of strain field along -5 the [111] direction of the Pt nanoparticle measured by conventional step-by-step (a, c and e) and continuous (b, d and f) scanning. The direction of the scattering vector, CONCLUSION Q111, is indicated in the figure. The continuous scanning approach offers a faster measurement and FIGURE 3: Central slice of the reconstructed strain for the scanning time was significantly reduced with a 30% gain. This gain the step-by-step (a-b), continuous (c-d) scans and of is significant, it can improve the reliability of the data acquisition, as the (e-f) difference of the reconstructed strains of the step-by-step scan. Ticks correspond to 100 nm. (g) there is less time for instabilities in the experiment to mitigate the results Histograms of the strain (e111) reconstructed for bothscanning methods. (h) Histogram of the strain difference (e.g. sample or beam drifts). The reduction in the data acquisition time between the two scanning methods on a voxel-by-voxel predestines continuous scanning BCDI for in situ and operando studies basis as well as its Gaussian fit. of functional materials. 91