Horst Borrmann
Phone: +49 351 4646-2211
Fax: +49 351 4646-4002
Room: B1.2.11

Scientific Report


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We are using X-ray diffraction as a powerful and versatile analytical tool in the characterisation of materials and compounds. A broad range of powder diffraction instruments allows to optimize sensitivity as well as resolution. At least three different wavelengths are available, in any case the X-ray beam is well defined monochromatic. The vast majority of  powder diffraction experiments is targeting phase identification along with optimizing reaction conditions in the synthesis on new compounds. Selected compounds are studied in-situ at low and/or high temperatures or even in well defined atmosphere. Structure solution and refinement from powder diffraction data along with analysis of materials properties are based on optimized measurements using pure samples.

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Single crystal diffraction clearly is still more powerful in solving new crystal structures and the refinement based on single crystal data provides for very detailed analyses up to very high levels. Our diffractometers have been optimized to suit our specific needs. Harder X-rays not only reduce absorption of heavy elements but also allow for data up to very high resolution. In vast majority of cases limitations are given by the quality of crystals available. High resolution data along with detailed data analysis ultimately allow to study distribution of electrons and to correlate with specific properties (charge density analysis). However, excellent data also allow to derive fine details like absolute structure, specific disorder, twinning, diffuse scattering and many more.

In any case we are considering careful maintenance of our instruments as ultimate key to highest standards in quality and reliability of data. In addition this allows for constant improvements which are vastly enhanced by close interaction with the vendors of the instruments, but also with other companies and people in the field.

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