O.R. MHP │High-pressure materials

Manager : Vladimir L. SOLOZHENKO


In the field of high pressure (HP), we distinguish solid HP (always expressed in pascals) from fluid HP (commonly expressed in bars*) by the nature of the pressure-transmitting medium ensuring the hydrostaticity of the stresses; in this case, the high pressure – high temperature (HP-HT) and high pressure – large deformations (HP-GD) activities on which the main scientific objectives of this research operation (R.O.) are based fall respectively into each of these categories

* Since 1982, all thermodynamic data are tabulated for a standard pressure of 1 bar (1000 hPa) instead of 1013.25 mbar (1 atm).

HP-HT | Synthesis of new phases in the B-C-N-O-X system

This fundamental research activity concerns phase relationships and chemical interactions in binary and ternary subsystems of the B-C-N-O-X system (where X = P, Si, S or Se typically) at high pressure and high temperature. The use of various high-volume HP devices and diamond anvil and laser heating cells, combined with in situ characterization techniques (synchrotron X-ray diffraction and electrical resistivity measurements), opens wide possibilities to study thermodynamic and kinetic aspects as well as the mechanisms of formation of new binary and ternary phases in systems containing light elements up to pressures of 50 GPa and temperatures of 4000 K. Particular attention is given to new ultradural, refractory, superconducting or high energy density phases whose properties and thermal stability are of technological importance. The possibility of synthesizing new ultradurified bulk nanomaterials is also explored. A large international network and privileged access to large state-of-the-art experimental facilities (including the third generation synchrotron radiation sources ESRF, PETRA III and SPring-8) allow to conduct cutting-edge research under extreme pressure and temperature conditions and thus to shed light on the factors responsible for the formation of phases composed of light elements (in particular those rich in boron) which is of paramount importance for high-pressure chemistry and materials science. This research topic has been supported by the European research and innovation program Horizon 2020 under the project Flintstone2020.

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

HP-GD │Transformation and characterization of materials under pressure

This research theme relies on a complete set of specific 20 kbar fluid HP equipment: differential hydrostatic extrusion, cold isostatic compaction (CIP) and hydrostatically confined uniaxial traction/compression, which has allowed to lift technological locks in the field of grain orientation of superconducting ceramics at high critical temperature and complete densification of nanomaterials elaborated by powder metallurgy, as described in the plate below. Based on their crossed competences in metallurgy, it is currently developed in close inter-axis collaboration with the O.R. 2MP of the MECAMETA axis to which we refer the reader. The MHP R.O. is in contact with the company Thiot Ingénierie, expert in shock physics.

HP assisted shaping of HTc superconductors and nanomaterials[pdf]

The MHP R.O. is not only active within the High Pressure Technology Network of the Mission for Transversal and Interdisciplinary Initiatives of the CNRS, but its fluid HP resources, unique in Europe (cf. brochure above), have been set up as a regional platform (shared research infrastructure with its own steering committee) where they have been augmented by a Gleeble 3500 thermomechanical simulator, a new hot isostatic compaction press (HIP 4000 bar 1450 °C Nova Swiss) and a transportable residual stress measurement device INEL X-solo all acquired under the SESAME 2013 CARAMÉL project (Sorbonne Paris Nord University project for the characterization of materials and their elaboration) whose name the platform officially takes since its inauguration in October 2017 on the occasion of the National Days on Pulsed Current Sintering. As expected, the ensemble formed “on the basis of the existing and [this] project [of the Île-de-France region’s device for the acquisition of medium-heavy equipment]” and benefiting from the technical support of the LSPM’s HPEM and DRX services is unique in the field of physical and mechanical metallurgy and complementary to the platforms present within other Île-de-France networks, including that of the CNRS F2M-msp federation and Arts et Métiers.

National days on pulse current sintering (SPS 2017)

Outstanding results

Synthesis of new phases in the system B–C–N–O–X

Compared to α-B₁₂, the phase γ-B₂₈ has two sub-networks of opposite load

Oganov AR, et al. Ionic high-pressure form of elemental boron. Nature 457 (2009) 863-7

Matar S, Étourneau J, Solozhenko VL. First-principles investigations of tricarbon: from the isolated C₃ molecule to a novel ultra-hard anisotropic solid. Carbon Trends 6 (2022) 100132 (hal-03505796)

Cherednichenko KA, et al. Discovery of new boron-rich chalcogenides : orthorhombic B₆X (X=S, Se). Sci. Rep.10 (2020) 9277 (hal-02862671)

Solozhenko VL, Bushlya V, Zhou J. Mechanical properties of ultra-hard nanocrystalline cubic boron nitride. J. Appl. Phys. 126 (2019) 075107 (article faisant la couverture du journal)

Solozhenko VL, et al. Ultimate metastable solubility of boron in diamond : synthesis of superhard diamondlike BC₅. Phys. Rev. Lett. 102 (2009) 015506

Solozhenko VL, et al. Synthesis of superhard cubic BC₂N. Appl. Phys. Lett. 78 (2001) 1385-7

Complete densification of nanomaterials produced by powder metallurgy

Étape de densification ultime par ’extrusion douce’ (extrusion hydrostatique à faible différentiel amont/aval)

Champion Y, et al. Fabrication of bulk nanostructured materials from metallic nanopowders : structure and mechanical behaviour. Scripta Mater. 44 (2001) 1609-13

Champion Y, et al. Near-perfect elastoplasticity in pure nanocrystalline oopper. Science 300 (2003) 310-1

Grain orientation of HTc superconducting ceramics

Texturing under repeated cycles of hydrostatically confined uniaxial compression

Nhien S, Langlois P. Quantitative analysis of grain alignment in ceramic Bi-2223 superconductor powder by pressure-assisted compression. Physica C 281 (1997) 129-34

Grynszpan RI, et al. Texture effect on vortex‐state TF‐μ⁺SR in Bi‐2223 high‐Tc materials. Hyperfine Interact. 105 (1997) 95-100

High Pressure Technology Network Publication

The book Materials and seals for high pressure, designed in collaboration between the LIMHP Villetaneuse and one of the HP teams of the LPCM Bellevue (later integrated into the LSPM) on the occasion of the first national training action (this action was itself renewed four times between 2000 and 2013) of the first CNRS technology network, has been republished twice.
1998 | Lavoisier Editions – Collection Technique & documentation
2004 | Publications of the University of Saint-Etienne – Collection Integrations
2011 | Publications of the Mission ressources et compétences technologiques (CNRS)

This work is now deposited on the multidisciplinary open archive portal HAL of the Center for Direct Scientific Communication of the CNRS.

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