2D- & 3D-micro-XRF

We have build a laboratory based 2D micro-XRF instrument which will soon be updated to become a 3D confocal micro-XRF. We use polycapillary optics to focus the X-ray beam to a focal spot with ca. 20 µm in diameter. The energy dispersive Silicon Drift Detector (SDD) allows us to aquire full spectra at each pixel (voxel). Images of elemental distribution are obtained quasi-nondestructively, a major advantage over electron microscopy together with relative high information depth (due to the higher penetration depth).

XRF is especially sensitive to high Z elements. Due to the non-invasive nature of the analysis (photon excitation/photon detection) the sample environment can be kept close to pristine conditions e.g. battery electrodes in a battery pouch cell. It also allows to probe samples in a liquid state e.g. inside a glass capillary.

CMXRF (confocal micro-XRF)

Using synchrotron confocal micro-XRF (Fluo beam line at ANKA Karlsruhe Germany) we have obtained 3D images of contaminant element distribution in Li-ion battery anodes. Soon this capability will be available in our laboratory.

 

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