Laboratory setup for rapid in situ powder X-ray diffraction elucidating Ni particle formation in supercritical methanol

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The design and function of a custom-made Soller slit for a laboratory 2D area detector is presented through a series of demonstration images
and an in situ experiment following the formation of nickel particles in supercritical methanol. The in situ experiment is performed in a
capillary sample environment, modified for a laboratory scale Rigaku Smartlab diffractometer, and with a temperature range of 300–1050 K.
The formation of nickel particles was followed successfully using laboratory in situ X-ray powder diffraction with a time resolution in the order
of 27 s. Observations from the area detector images showed the appearance of three distinct phases during the reaction: Ni3(NO3)2(OH)4,
NiO, and Ni. The images were linearly integrated and analyzed using Rietveld refinement. A reaction mechanism is proposed based on an
evaluation of the weight fractions and scattering factors as a function of reaction time.
Original languageEnglish
Article number073902
JournalReview of Scientific Instruments
Pages (from-to)073902
Number of pages8
Publication statusPublished - 10 Jul 2019

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