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High-resolution two-axis diffractometer D1A

The high-resolution powder diffractometer D1A is still unique in being able to provide high resolution at long wavelengths, with shorter wavelength contamination eliminated by the guide tube. D1A is particularly suited to magnetic structures and other large d-spacing studies, such as zeolites.

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Applications

Crystal and magnetic structure determination of powder or polycrystalline compounds with cell volumes up to 1000 Å3 using λ=1.91Å.

 

Detailed study of overlapping structural or magnetic peaks with large d-spacings, 1.5Å<d<40Å, using λ=3Å.


Temperature-dependent (spectra every 2 hours) high resolution studies on high symmetry (good scattering) systems profiting from the very low background of D1A (see figure below).

Determination of the different transition temperatures in the doped double perovskite Sr2Fe0.75Co0.25MoO6. Decoupling of the Curie temperature TC from the temperature Ttetra where the system becomes metrically cubic and TS where the transition from I4/m to Fm3m takes place. (see figure below).