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Despite the ubiquity of ferrihydrite in natural sediments and its importance as an industrial sorbent, the nanocrystallinity of this iron oxyhydroxide has hampered accurate structure determination by traditional methods that rely on long-range order. We uncovered the atomic arrangement by real-space modeling of the pair distribution function (PDF) derived(More)
We present a software developed for automated processing of 2D powder diffraction data-sets as for instance acquired with an image plate setup. For structural analysis, such 2D data usually is integrated to 2θ-scan powder diffraction patterns. Our software is capable to automate such integrations including a geometry correction and automated masking of(More)
The high-pressure behaviour of PbS was investigated by angular dispersive X-ray powder diffrac-tion up to pressures of 6.8 GPa. Experiments were accompanied by first principles calculations at the density functional theory level. By combining both methods reliable data for the elastic properties of rock-salt type α-and high-pressure β-PbS could be obtained.(More)
We report development of micro-focusing optics for high-energy x-rays by combining a sagittally bent Laue crystal monchromator with Kirkpatrick-Baez (K-B) X-ray focusing mirrors. The optical system is able to provide a clean, high-flux X-ray beam suitable for pair distribution function (PDF) measurements at high pressure using a diamond anvil cell (DAC). A(More)
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