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Description
The single crystaldiffractometer HEiDi at the research neutron source at the Heinz Maier-Leibnitz Zentrum (MLZ) offers high flux, high resolution and large q range, low absorption and high sensitivity for light elements.
In 2016 a BMBF funded project (05K16PA3) was launched in order to allow studys on tiny samples < 1 mm³ and with high pressure cells for isotropic pressure on single crystals, for instance in order to study structural properties down to low temperatures on MgFe4Si3 compounds and their magnetic features [A. Grzechnik et al.; J. Appl. Cryst. 51 (2018)].
Within this project the optimizations on the instrument focus on optimized optical components (new Cu220 monochromator, soller collimators and guides) as well as in the development of various high-pres¬sure diamond anvil cells (DAC) (panoramic and transmis-sion cells) for which first data collections could be performed. The panoramic DAC offer a large opening angle and can be placed in the modified cryostat with an optical window. Pressure changes with temperature are fol¬lowed with ruby luminescence. The new low-tempera¬ture set up allows temperatures down to 3 K. Transmission DAC are suitable for both neutron and X-ray diffraction. The membrane version can be operated remotely changing its pressure via a He gas filled membrane.
