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 ┬Ám 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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