A versatile setup in reflection mode for in situ diffraction patterns acquisition from flat polycrystalline specimens bathed in a liquid medium
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2017
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RAU ANNUAL USERS MEETING LNLS/CNPEM
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A cell to perform in situ diffraction measurements of specimens regularly immersed in a
liquid medium has been developed. The assembly (see Fig. 1) has been adapted to work
in beamline XRD2 in reflection mode. Basically consists of a polypropylene box with
two windows made of poliimide to allow the passage of X-rays (incident and diffracted)
at lower angles. The flat sample is placed in the middle of the box that is on top of the
goniometer head. For safety reasons the central box is positioned over a tray to avoid
spillage of liquid. On the bottom of the cell there is a connection to the pipe linked to the
syringe. The syringe is driven by a beamline stepping motor. This way it is easy to
synchronise the filling and evacuation of liquid from the cell with the actual data
acquisition of diffraction patterns. The idea is to soak the flat specimen with the liquid
and then remove it to acquire the diffraction data. This can be done in a sequential way
for several hours to monitor the crystalline phases present on the surface (or rather a few
microns deep) of the flat specimen. Various reactions can be investigated this way,
provided that the sample is flat. Ceramics, metals, and polymers in contact with liquids
could be studied. Preliminary tests have been performed in two theta – theta geometry on
metal plates in contact with acid solutions to simulate accelerated corrosion. However a
large variety of experiments with other geometries, (grazing incidence) could be carried
out and of course this assembly could be used on SIRIUS with better time resolution.
Como referenciar
CAREZZATO, G.L.; COUTO, C.P.; ROSSI, J.L.; MARTINEZ, L.G.; TURRILLAS, X. A versatile setup in reflection mode for in situ diffraction patterns acquisition from flat polycrystalline specimens bathed in a liquid medium. In: RAU ANNUAL USERS MEETING LNLS/CNPEM, November 22-24, 2017, Campinas, SP. Abstract... p. 50-50. Disponível em: http://repositorio.ipen.br/handle/123456789/28605. Acesso em: 30 Dec 2025.
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