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Spatial correlation of embedded nanowires probed by X-ray off-Bragg scattering of the host matrix

Abstract : It is shown that information on the spatial correlation of nano-objects embedded in a crystalline matrix can be retrieved by analysing the X-ray scattering around the Bragg reflections of the host matrix. Data are reported for vertically aligned Ni and CoNi alloy nanowires (NWs) in an SrTiO 3 matrix. When the Bragg condition is fulfilled for the matrix and not for the NWs, the latter can be approximated by voids, and the scattering around the matrix reflections contains information on the self-correlation of the NWs ( i.e. on their diameter d ) and on the correlation between NWs (interdistance D ). Nondestructive synchrotron X-ray diffraction data provide information on these values averaged over large areas, complementing local transmission electron microscopy observations. The measurements show that off-Bragg scattering around the matrix reflections can be exploited to study the spatial correlation and morphology of embedded nano-objects, independently of their crystallinity or strain or the presence of defects.
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https://hal-cnrs.archives-ouvertes.fr/hal-03384844
Contributor : Maurizio Sacchi Connect in order to contact the contributor
Submitted on : Tuesday, October 19, 2021 - 10:50:36 AM
Last modification on : Friday, December 3, 2021 - 11:43:04 AM

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Thomas Tran, Xiaorong Weng, Marcel Hennes, Dominique Demaille, Alessandro Coati, et al.. Spatial correlation of embedded nanowires probed by X-ray off-Bragg scattering of the host matrix. Journal of Applied Crystallography, International Union of Crystallography, 2021, 54 (4), pp.1173-1178. ⟨10.1107/S1600576721006579⟩. ⟨hal-03384844⟩

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