SPring-8, the large synchrotron radiation facility

Speaker: Dr. Nicolas Guignot

Language: English

Affiliation: Synchrotron SOLEIL, France

Title: Recent developments in HP-HT materials research using synchrotron radiation at the PSICHE beamline, synchrotron SOLEIL

Abstract:
The PSICHE beamline (synchrotron SOLEIL, France) is focused on the determination of various materials physical properties in-situ at high pressure – high temperature (HP-HT), e.g. thermoelastic properties, viscosity, electrical or thermal conductivity but also phase transitions and structural studies. Imaging, tomography and X-ray diffraction (XRD) techniques have been specifically designed for large volume presses (Multi-anvil and Paris-Edinburg). For XRD the beamline is operated in white beam mode, focused in the vertical direction for a very high flux or parallel. Lots of efforts have also been made to design different types of pink beam modes, extremely useful for 2D imaging and tomography. We present here the different setups and recent experiments and developments to illustrate the possibilities of the beamline.
Our first station is the multi-anvil (MA) apparatus that has proven to be invaluable for experiments where an excellent control over pressure and temperature conditions and a large sample volume are required. Our setup consists of -1/ a 1200 tons load capacity MA press with a (100) DIA compression module - 2/ a CAESAR (combined angle- and energy-dispersive structural analysis and refinement, Wang et al. 2004) XRD setup, which is the ideal tool when accurate structural measurements are required, especially in the case of liquids and amorphous materials -3/ a high resolution imaging system, with framerates up to 2 kHz full-frame and beam sizes up to 10x4 mm² (HxV). This latter mode is illustrated with recent results obtained on viscosity measurements of forsterite and diopside liquid compositions up to 30 GPa.
The second setup consists of a couple of Paris-Edinburg presses, one with rotational anvils (rotoPEc, Philippe et al. 2016) used to perform full or partial 3D reconstructions of samples at HP-HT conditions. These tools have been used for example to measure the density of liquids and amorphous materials in combination with the CAESAR system. We will also show our very recent efforts to provide a station ready for ultra-fast tomography, opening up the way for time resolved 3D imaging at HP-HT.

Reference
Y. Wang et al., A new technique for angle-dispersive powder diffraction using an energy-dispersive setup and synchrotron radiation (2004), J. Appl. Cryst., 37, 947–956
J. Philippe et al., Novel portable press for synchrotron time-resolved 3-D micro-imagining under extreme conditions (2016), AIP Conference Proceedings, 1741, 30002

Organizer: Higo Yuji
e-mail: higospring8.or.jp
PHS: 3721