Abstract
The high resolution powder diffractometer SPODI (jointly operated by the Karlsruhe Institute of Technology and the Technische Universität München) is designed for structure solution and Rietveld refinement of crystal and magnetic structural parameters on polycrystalline powders. Instrumental specification (design, flexibility, peak shape, resolution etc.) as well as a variety of specialized sample environment equipment implemented for in-situ materials characterisation make the instrument attractive for studies of complex ordering phenomena.
Highlights
The instrument is characterised by a very high monochromator take-o angle of 155°
The two-dimensional raw data are evaluated to provide di raction patterns corresponding to di erent detector heights ranging from 10 mm to 300 mm and variable detector height, accounting for vertical beam divergence e ects
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
Summary
The instrument is characterised by a very high monochromator take-o angle of 155° (standard conguration). The two-dimensional raw data are evaluated to provide di raction patterns corresponding to di erent detector heights ranging from 10 mm to 300 mm and variable detector height, accounting for vertical beam divergence e ects. Asymmetric broadenings at quite low and high scattering angles are overcome, while the full detector height in the medium 2θ regime can be used (Hoelzel et al, 2012).
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