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High resolution powder diffractometer
The high resolution powder diffractometer SPODI is designed for structure solution and Rietveld refinement of structural parameters on crystalline powders. The instrument is characterised by a very high monochromator take-off angle of 155° (standard configuration). Optionally, a take-off angle of 135° is available.
The detector array consists of 80 3He position sensitive detector tubes (300 mm active height) with fixed Soller collimators of 10’ horizontal divergence. The multidetector of SPODI spans an angular range of 2θ = 160°. Each detector covers 2° corresponding to 160°/ 80 detectors. Therefore the data collection is performed via stepwise positioning of the detector array to obtain a diffraction pattern of the desired step width (typically 2°/ 40 steps resulting in Δ(2θ) = 0.05°).
The two-dimensional raw data are evaluated to provide diffraction patterns corresponding to different detector heights ranging from 10 mm to 300 mm and variable detector height, accounting for vertical beam divergence effects. Thus, asymmetric broadenings at quite low and high scattering angles are overcome, while the full detector height in the medium 2θ regime can be used .
Various sample environmental devices enable the characterisation of materials under special conditions: A rotatable tensile rig allows in-situ studies under tensile stress, compression stress or torsion while the load axis can be oriented with respect to the scattering plane. A potentiostat for charging/discharging of Lithium ion batteries is available as well as a device to apply high electric fields on ferroelectrics.
 Hoelzel, M. et al., Nucl. Instr. A 667, 32-37 (2012).
DISEMM (Diffraction assisted mechanical modeling)
The software DISEMM is designed to analyze diffraction data from in-situ loading experiments to obtain diffraction elastic constants and single-crystal elastic constants as well as to describe the mechanical behavior by the elasto-plastic self –consistent modeling.
DISEMM offers a variety of grain-to-grain interaction models, integrates texture and multi-phase alloys.
Heldmann et al. (2019), Journal of applied crystallography
The software is currently available for Windows.
The download provided here provides a .zip file consisting of libraries and the executable, just unpack and you are ready. The DISEMM software code can be found on github, you can get the corresponding manual here.
Dr. Markus Hölzel
Phone: +49 (0)89 289-14314
Dr. Anatoliy Senyshyn
Phone: +49 (0)89 289-14316
Dr. Stefan Strangmüller
Telefon: +49 (0)89 289-12698
Phone: +49 (0)89 289-14826
Find the latest publications regarding SPODI in our publication database iMPULSE:
Heinz Maier-Leibnitz Zentrum. (2015). SPODI: High resolution powder diffractometer. Journal of large-scale research facilities, 1, A5. http://dx.doi.org/10.17815/jlsrf-1-24
M. Hoelzel, A. Senyshyn, N. Juenke, H. Boysen, W. Schmahl, H. Fuess., Nucl. Instr. A 667 (2012) 32-37, http://dx.doi.org/10.1016/j.nima.2011.11.070
For citation please always include the DOI.