SKM 2023 – wissenschaftliches Programm

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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 6: Poster

KFM 6.33: Poster

Dienstag, 28. März 2023, 17:00–19:00, P3

First X-ray diffraction measurement from high pressure hydrostatic cells for X-ray scattering applications — •Kevin Lehninger, Eric Schneider, Jaqueline Savelkouls, Michael Paulus, and Christian Sternemann — Fakultät Physik/DELTA, Technische Universität Dortmund, 44221 Dortmund, Germany

Small-angle and wide-angle X-ray scattering (SAXS/WAXS) at moderate pressures are of increasing importance for the investigation of e.g. protein denaturation or stimulus-responsive materials. One of the experimental challenges is the precise pressure control in the pressure range up to 10 kbar while separating the sample volume from the pressure-transmitting medium. To this end, we present two dedicated hydrostatic high pressure cells designed for use at the beamlines BL2 and BL9 of the synchrotron radiation source DELTA, which use water for pressure transmission, and show first measured diffratograms of gold and potassium bromide. The WAXS cell with an opening angle of 60 degrees allows a sample volume with a cross-sectional area of one square millimetre to be exposed to a maximum pressure of 5000 bar. The sample volume is enclosed in a flexible capillary tube capillary tube, which is located between two diamond windows and can have a maximum diameter of 1.5 mm. The SAXS cell can be operated up to a pressure of 10kbar and an opening angle of 20 degrees. Here, the sample volume is contained in a cylinder sealed with polyimide film which is screwed into the high-pressure cell via a sliding system.