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Accueil > Axes de Recherche > MINOS > O.R.4 | Élaboration et transformation de matériaux sous haute pression > Descriptif

Description

par Patrick Langlois - publié le


 
Head : Vladimir L. SOLOZHENKO
 


 

High pressures are referred to as solid or fluid depending on the nature of the pressure-transmitting medium ; in the instance of this research operation (O.R.), the main scientific objectives are based on activities, which relate either to high pressure and high temperature (HP-HT) or to high pressure and large deformations (HP-LD), that fall into the solid and fluid categories respectively.

 

  • HP-HT | Synthesis of Novel Phases in the B–C–N–O–X System

    This fundamental-research activity deals with the chemical interactions and the phase relations in the binary and ternary subsystems of the B–C–N–O–X system (X = P, Si, S, Se) at high pressures and high temperatures. The use of various large-volume high-pressure devices and laser-heated diamond-anvil cells in combination with in-situ probing (synchrotron X-ray diffraction and electrical resistivity measurements) opens wide possibilities to study thermodynamic and kinetic aspects as well as mechanisms of formation of new binary and ternary phases in the systems containing light elements at pressures up to 50 GPa and temperatures up to 4000 K. A particular attention is paid to the new superhard, refractory, superconducting, and high-energy-density phases whose advanced properties and thermal stability could be of technological importance (see Highlights). The high-pressure synthesis of novel superhard bulk nanomaterials is also explored. Broad international networking and privileged access to the state-of-the-art experimental facilities (including third-generation synchrotron light sources such as ESRF, PETRA III, and SPring-8) allow performing cutting-edge research at extreme pressure-temperature conditions and shedding light on the factors responsible for the phase formation of compounds of light elements (boron-rich solids, in particular), which is of great importance for high-pressure chemistry and materials science. The HP-HT research has been supported by the European Union Horizon 2020 Research and Innovation Programme through the Flintstone2020 project.

    Implementation of a 20 GPa 2200 °C multi-anvil press (Labex SEAM video)

     

  • HP-LD | Transformation and Characterization of Materials

    This activity is backed up by specific resources : differential hydrostatic extrusion, hydrostatically confined uniaxial tensile/compressive testing, and CIP up to 20 kbar (2 GPa). Technological breakthroughs have already been achieved in terms of grain orientation for HTSCs and of full densification for Bottom-Up-processed nanomaterials (see Highlights). The activity is now developed in close collaboration with O.R. 2MP, to which we refer the reader, and with Thiot Ingénierie which runs the first private shock-physics laboratory in Europe.

 

O.R.4 is particularly active within the High-Pressure Technology Network of the CNRS Interdisciplinarity Mission. Furthermore, its HP-LD resources, which are unique in Europe, have been entrusted to the regional CARAMÉL platform (officially opened in October 2017, as shown below) in addition to 4 kbar 1450 °C HIP and Gleeble 3500 thermomechanical simulator.

SPS 2017 workshop

 

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