EHPRG

Welcome to the official website of the European High Pressure Research Group (EHPRG).

EHPRG is non-profitable academic association established in 1963 which is devoted to science and technology of matter under high pressure. It organizes an annual meeting which brings together hundreds of scientists of various fields, mainly physics, chemistry, Earth and planetary sciences, bio- and food science and technology.

The reasonable size of the group, low conference fees, and a friendly relationship between the attendants have made EHPRG meetings a major event in the European high-pressure community for more than half a century.

Selection of high-pressure related titles from top scientific journals.

Lower crustal earthquake associated with highly pressurized frictional melts
by Xin Zhong


Nature Geoscience, Published online: 17 June 2021; doi:10.1038/s41561-021-00760-x

Earthquakes in the lower crust may be facilitated by overpressure of frictional melts, according to pressure estimates from an analysis of quartz inclusions in garnets from pseudotachylytes in the Bergen Arcs.
17 Jun 2021 at 12:00am
Photovoltaic-driven microbial protein production can use land and sunlight more efficiently than conventional crops [Sustainability Science]
by Dorian Leger, Silvio Matassa, Elad Noor, Alon Shepon, Ron Milo, Arren Bar-Even
Population growth and changes in dietary patterns place an ever-growing pressure on the environment. Feeding the world within sustainable boundaries therefore requires revolutionizing the way we harness natural resources. Microbial biomass can be cultivated to yield protein-rich feed and food supplements, collectively termed single-cell protein (SCP). Yet, we still lack...
21 Jun 2021 at 9:05pm
Time-restricted feeding protects the blood pressure circadian rhythm in diabetic mice [Systems Biology]
by Tianfei Hou, Wen Su, Marilyn J. Duncan, Vsevolozhskaya A. Olga, Zhenheng Guo, Ming C. Gong
The quantity and quality of food intake have been considered crucial for peoples' wellness. Only recently has it become appreciated that the timing of food intake is also critical. Nondipping blood pressure (BP) is prevalent in diabetic patients and is associated with increased cardiovascular events. However, the causes and mechanisms...
14 Jun 2021 at 9:04pm
Deep learning combined with IAST to screen thermodynamically feasible MOFs for adsorption-based separation of multiple binary mixtures
by Ryther Anderson
The Journal of Chemical Physics, Volume 154, Issue 23, June 2021.
The structures of metal–organic frameworks (MOFs) can be tuned to reproducibly create adsorption properties that enable the use of these materials in fixed-adsorption beds for non-thermal separations. However, with millions of possible MOF structures, the challenge is to find the MOF with the best adsorption properties to separate a given mixture. Thus, computational, rather than experimental, screening is necessary to identify promising MOF structures that merit further examination, a process traditionally done using molecular simulation. However, even molecular simulation can become intractable when screening an expansive MOF database for their separation properties at more than a few composition, temperature, and pressure combinations. Here, we illustrate progress toward an alternative computational framework that can efficiently identify the highest-performing MOFs for separating various gas mixtures at a variety of conditions and at a fraction of the computational cost of molecular simulation. This framework uses a “multipurpose” multilayer perceptron (MLP) model that can predict single component adsorption of various small adsorbates, which, upon coupling with ideal adsorbed solution theory (IAST), can predict binary adsorption for mixtures such as Xe/Kr, CH4/CH6, N2/CH4, and Ar/Kr at multiple compositions and pressures. For this MLP+IAST framework to work with sufficient accuracy, we found it critical for the MLP to make accurate predictions at low pressures (0.01–0.1 bar). After training a model with this capability, we found that MOFs in the 95th and 90th percentiles of separation performance determined from MLP+IAST calculations were 65% and 87%, respectively, the same as MOFs in the simulation-predicted 95th percentile across several mixtures at diverse conditions (on average). After validating our MLP+IAST framework, we used a clustering algorithm to identify “privileged” MOFs that are high performing for multiple separations at multiple conditions. As an example, we focused on MOFs that were high performing for the industrially relevant separations 80/20 Xe/Kr at 1 bar and 80/20 N2/CH4 at 5 bars. Finally, we used the MOF free energies (calculated on our entire database) to identify privileged MOFs that were also likely synthetically accessible, at least from a thermodynamic perspective.
17 Jun 2021 at 12:06pm
Immiscibility in N2–H2O solids up to 140 GPa
by Xiao Zhang
The Journal of Chemical Physics, Volume 154, Issue 23, June 2021.
Nitrogen and water are very abundant in nature; however, the way they chemically react at extreme pressure–temperature conditions is unknown. Below 6 GPa, they have been reported to form clathrate compounds. Here, we present Raman spectroscopy and x-ray diffraction studies in the H2O–N2 system at high pressures up to 140 GPa. We find that clathrates, which form locally in our diamond cell experiments above 0.3 GPa, transform into a fine grained state above 6 GPa, while there is no sign of formation of mixed compounds. We point out size effects in fine grained crystallites, which result in peculiar Raman spectra in the molecular regime, but x-ray diffraction shows no additional phase or deviation from the bulk behavior of familiar solid phases. Moreover, we find no sign of ice doping by nitrogen, even in the regimes of stability of nonmolecular nitrogen.
17 Jun 2021 at 12:58pm
Electro-Optomechanical Modulation Instability in a Semiconductor Resonator
by Pierre Etienne Allain, Biswarup Guha, Christophe Baker, David Parrain, Aristide Lemaître, Giuseppe Leo, and Ivan Favero
Author(s): Pierre Etienne Allain, Biswarup Guha, Christophe Baker, David Parrain, Aristide Lemaître, Giuseppe Leo, and Ivan Favero


In semiconductor nano-optomechanical resonators, several forms of light-matter interaction can enrich the canonical radiation pressure coupling of light and mechanical motion and give rise to new dynamical regimes. Here, we observe an electro-optomechanical modulation instability in a gallium arseni...


[Phys. Rev. Lett. 126, 243901] Published Thu Jun 17, 2021
17 Jun 2021 at 12:00pm
Double Superconducting Dome and Triple Enhancement of ${T}_{c}$ in the Kagome Superconductor ${\mathrm{CsV}}_{3}{\mathrm{Sb}}_{5}$ under High Pressure
by K. Y. Chen, N. N. Wang, Q. W. Yin, Y. H. Gu, K. Jiang, Z. J. Tu, C. S. Gong, Y. Uwatoko, J. P. Sun, H. C. Lei, J. P. Hu, and J.-G. Cheng
Author(s): K. Y. Chen, N. N. Wang, Q. W. Yin, Y. H. Gu, K. Jiang, Z. J. Tu, C. S. Gong, Y. Uwatoko, J. P. Sun, H. C. Lei, J. P. Hu, and J.-G. Cheng


${\mathrm{CsV}}_{3}{\mathrm{Sb}}_{5}$ is a newly discovered ${Z}_{2}$ topological kagome metal showing the coexistence of a charge-density-wave (CDW)-like order at ${T}^{*}=94\text{ }\text{ }\mathrm{K}$ and superconductivity (SC) at ${T}_{c}=2.5\text{ }\text{ }\mathrm{K}$ at ambient pressure. Here, ...


[Phys. Rev. Lett. 126, 247001] Published Thu Jun 17, 2021
17 Jun 2021 at 12:00pm
Multistep Dissociation of Fluorine Molecules under Extreme Compression
by Defang Duan, Zhengtao Liu, Ziyue Lin, Hao Song, Hui Xie, Tian Cui, Chris J. Pickard, and Maosheng Miao
Author(s): Defang Duan, Zhengtao Liu, Ziyue Lin, Hao Song, Hui Xie, Tian Cui, Chris J. Pickard, and Maosheng Miao


All elements that form diatomic molecules, such as ${\mathrm{H}}_{2}$, ${\mathrm{N}}_{2}$, ${\mathrm{O}}_{2}$, ${\mathrm{Cl}}_{2}$, ${\mathrm{Br}}_{2}$, and ${\mathrm{I}}_{2}$, are destined to become atomic solids under sufficiently high pressure. However, as revealed by many experimental and theore...


[Phys. Rev. Lett. 126, 225704] Published Fri Jun 04, 2021
4 Jun 2021 at 12:00pm
Ultrafast phase transitions in polyamorphic materials triggered by swift heavy ion impacts
by Henrique Vázquez and Flyura Djurabekova
Author(s): Henrique Vázquez and Flyura Djurabekova


We report unexpectedly fast phase transitions inside the track as pressure and temperature develop after a swift heavy ion impact. By means of molecular dynamics simulations we reveal the origin of the core-shell fine structure observed in a-${\mathrm{Si}}_{}{\mathrm{O}}_{2}$ and a-${\mathrm{Si}}_{3...


[Phys. Rev. Materials 5, 065603] Published Wed Jun 16, 2021
16 Jun 2021 at 12:00pm
$β$-Technetium: An allotrope with a nonstandard volume-pressure relationship
by Emily Siska, Dean Smith, Christian Childs, Daniel Koury, Paul M. Forster, Keith V. Lawler, and Ashkan Salamat
Author(s): Emily Siska, Dean Smith, Christian Childs, Daniel Koury, Paul M. Forster, Keith V. Lawler, and Ashkan Salamat


We report the synthesis and structure of the second allotrope of technetium, $β\text{−}\mathrm{Tc}$. Transformative pathways are accessed at extreme conditions using the laser-heated diamond anvil cell and confirmed with in situ synchrotron x-ray diffraction and Raman spectroscopy. $β\text{−}\mathrm...


[Phys. Rev. Materials 5, 063603] Published Wed Jun 09, 2021
9 Jun 2021 at 12:00pm
Tuning interchain ferromagnetic instability in ${A}_{2}{\mathrm{Cr}}_{3}{\mathrm{As}}_{3}$ ternary arsenides by chemical pressure and uniaxial strain
by Giuseppe Cuono, Filomena Forte, Alfonso Romano, Xing Ming, Jianlin Luo, Carmine Autieri, and Canio Noce
Author(s): Giuseppe Cuono, Filomena Forte, Alfonso Romano, Xing Ming, Jianlin Luo, Carmine Autieri, and Canio Noce


We analyze the effects of chemical pressure induced by alkali-metal substitution and uniaxial strain on magnetism in the ${A}_{2}{\mathrm{Cr}}_{3}{\mathrm{As}}_{3}$ ($A$=Na, K, Rb, and Cs) family of ternary arsenides with quasi-one-dimensional structure. Within the framework of the density functiona...


[Phys. Rev. Materials 5, 064402] Published Wed Jun 02, 2021
2 Jun 2021 at 12:00pm
High-pressure synthesis, crystal structure, and properties of iron-based spin-chain compound ${\mathrm{Ba}}_{9}{\mathrm{Fe}}_{3}{\mathrm{Se}}_{15}$
by Jun Zhang, Alexander C. Komarek, Meiling Jin, Xiancheng Wang, Yating Jia, Jianfa Zhao, Wenmin Li, Zhiwei Hu, Wei Peng, Xiao Wang, Liu Hao Tjeng, Zheng Deng, Runze Yu, Shaomin Feng, Sijia Zhang, Min Liu, Yi-feng Yang, Hong-ji Lin, Chien-Te Chen, Xiaodong Li, Jinlong Zhu, and Changqing Jin
Author(s): Jun Zhang, Alexander C. Komarek, Meiling Jin, Xiancheng Wang, Yating Jia, Jianfa Zhao, Wenmin Li, Zhiwei Hu, Wei Peng, Xiao Wang, Liu Hao Tjeng, Zheng Deng, Runze Yu, Shaomin Feng, Sijia Zhang, Min Liu, Yi-feng Yang, Hong-ji Lin, Chien-Te Chen, Xiaodong Li, Jinlong Zhu, and Changqing Jin


We report the synthesis of a quasi-one-dimensional (1D) iron selenide ${\mathrm{Ba}}_{9}{\mathrm{Fe}}_{3}{\mathrm{Se}}_{15}$. It was synthesized at high temperature and high pressure of 5.5 GPa and systematically studied via structural, magnetic, and transport measurements at both ambient and high p...


[Phys. Rev. Materials 5, 054606] Published Fri May 28, 2021
28 May 2021 at 12:00pm
Ferrimagnetism and spin reorientation in the high-pressure double double perovskites $\mathrm{Ca}\mathrm{Mn}\mathrm{Cr}\mathrm{Sb}{\mathrm{O}}_{6}$ and $\mathrm{Ca}\mathrm{Mn}\mathrm{Fe}\mathrm{Sb}{\mathrm{O}}_{6}$
by Elena Solana-Madruga, Padraig S. Kearins, Khalid N. Alharbi, Ciaran T. Lennon, Clemens Ritter, and J. Paul Attfield
Author(s): Elena Solana-Madruga, Padraig S. Kearins, Khalid N. Alharbi, Ciaran T. Lennon, Clemens Ritter, and J. Paul Attfield


Two $\mathrm{CaMn}B\mathrm{Sb}{\mathrm{O}}_{6}$ ($B=\mathrm{Cr}$ and Fe) high-pressure double double perovskites are reported. Spins in $\mathrm{Ca}\mathrm{Mn}\mathrm{Cr}\mathrm{Sb}{\mathrm{O}}_{6}$ order below ${T}_{\mathrm{C}}=49\phantom{\rule{0.16em}{0ex}}\mathrm{K}$ into a collinear ferrimagneti...


[Phys. Rev. Materials 5, 054412] Published Fri May 21, 2021
21 May 2021 at 12:00pm
Structural motifs and bonding in two families of boron structures predicted at megabar pressures
by Katerina P. Hilleke, Tadashi Ogitsu, Shuai Zhang, and Eva Zurek
Author(s): Katerina P. Hilleke, Tadashi Ogitsu, Shuai Zhang, and Eva Zurek


The complex crystal chemistry of elemental boron has led to numerous proposed structures with distinctive motifs as well as contradictory findings. Herein, evolutionary structure searches performed at 100 GPa have uncovered a series of metastable phases of boron, and bonding analyses were carried ou...


[Phys. Rev. Materials 5, 053605] Published Fri May 14, 2021
14 May 2021 at 12:00pm
Potential room-temperature multiferroicity in cupric oxide under high pressure
by William Lafargue-Dit-Hauret, Daniel Braithwaite, Andrew D. Huxley, Tsuyoshi Kimura, Andres Saúl, and Xavier Rocquefelte
Author(s): William Lafargue-Dit-Hauret, Daniel Braithwaite, Andrew D. Huxley, Tsuyoshi Kimura, Andres Saúl, and Xavier Rocquefelte


CuO, known to be multiferroic (MF) from ${T}_{L}\phantom{\rule{4pt}{0ex}}=\phantom{\rule{4pt}{0ex}}213\phantom{\rule{4pt}{0ex}}\mathrm{K}$ to ${T}_{N}\phantom{\rule{4pt}{0ex}}=\phantom{\rule{4pt}{0ex}}230\phantom{\rule{4pt}{0ex}}\mathrm{K}$ at ambient pressure, has been the subject of debates about ...


[Phys. Rev. B 103, 214432] Published Mon Jun 21, 2021
21 Jun 2021 at 12:00pm
Lattice melting and superconductivity in a group IV-VI compound
by Liu-Cheng Chen, Pei-Qi Chen, Wei-Jian Li, Qian Zhang, Viktor V. Struzhkin, Alexander F. Goncharov, Zhifeng Ren, and Xiao-Jia Chen
Author(s): Liu-Cheng Chen, Pei-Qi Chen, Wei-Jian Li, Qian Zhang, Viktor V. Struzhkin, Alexander F. Goncharov, Zhifeng Ren, and Xiao-Jia Chen


Inspired by the rich physical properties of IV-VI compounds, we choose polycrystalline ${\mathrm{Pb}}_{0.99}{\mathrm{Cr}}_{0.01}\mathrm{Se}$ to investigate its structural, vibrational, and electrical transport properties under pressure up to 50 GPa. The structural transitions from the $B1$ to $Pnma$...


[Phys. Rev. B 103, 214516] Published Mon Jun 21, 2021
21 Jun 2021 at 12:00pm
Behavior of rubidium at over eightfold static compression
by C. V. Storm, J. D. McHardy, S. E. Finnegan, E. J. Pace, M. G. Stevenson, M. J. Duff, S. G. MacLeod, and M. I. McMahon
Author(s): C. V. Storm, J. D. McHardy, S. E. Finnegan, E. J. Pace, M. G. Stevenson, M. J. Duff, S. G. MacLeod, and M. I. McMahon


The behavior and structure of Rb are explored up to 264 GPa, a pressure at which the density is increased more than eightfold. The previously predicted double-hexagonal close packed structure is stable above 200 GPa, while at lower pressures a change in compressibility at 30 GPa arises from s-d charge transfer. Above 30 GPa, the authors find that Rb has the regular compression of a d-type transition metal.


[Phys. Rev. B 103, 224103] Published Mon Jun 21, 2021
21 Jun 2021 at 12:00pm
Spectral proxies for bonding transitions in ${\mathrm{SiO}}_{2}$ and ${\mathrm{MgSiO}}_{3}$ polymorphs at high pressure up to 270 GPa by O $K$-edge x-ray Raman scattering
by Yoo Soo Yi, Hoon Khim, Yong-Hyun Kim, and Sung Keun Lee
Author(s): Yoo Soo Yi, Hoon Khim, Yong-Hyun Kim, and Sung Keun Lee


Advances in synchrotron x-ray Raman scattering (XRS) techniques enable probing of pressure-induced element-specific bonding transitions in diverse oxides beyond megabar pressures. Evolution of the electronic structures under extreme pressure involves an emergence of additional oxygen $1s$ electron e...


[Phys. Rev. B 103, 214109] Published Thu Jun 17, 2021
17 Jun 2021 at 12:00pm
Resonant enhancement of grazing incidence neutron scattering for the characterization of thin films
by Adrien Perrichon, Anton Devishvili, Kristina Komander, Gunnar K. Pálsson, Alexei Vorobiev, Rasmus Lavén, Maths Karlsson, and Max Wolff
Author(s): Adrien Perrichon, Anton Devishvili, Kristina Komander, Gunnar K. Pálsson, Alexei Vorobiev, Rasmus Lavén, Maths Karlsson, and Max Wolff


We use signal enhancement in a quantum resonator for the characterization of a thin layer of vanadium hydride using neutron reflectometry and demonstrate that pressure-concentration isotherms and expansion coefficients can be extracted from the measurement of totally externally reflected neutrons on...


[Phys. Rev. B 103, 235423] Published Thu Jun 17, 2021
17 Jun 2021 at 12:00pm
Pressure influence on the valence and magnetic state of Yb ions in noncentrosymmetric heavy-fermion $\mathrm{Yb}\mathrm{Ni}{\mathrm{C}}_{2}$
by D. A. Salamatin, V. A. Sidorov, N. M. Chtchelkatchev, M. V. Magnitskaya, N. Martin, A. E. Petrova, L. N. Fomicheva, Jing Guo, Cheng Huang, Yazhou Zhou, Liling Sun, and A. V. Tsvyashchenko
Author(s): D. A. Salamatin, V. A. Sidorov, N. M. Chtchelkatchev, M. V. Magnitskaya, N. Martin, A. E. Petrova, L. N. Fomicheva, Jing Guo, Cheng Huang, Yazhou Zhou, Liling Sun, and A. V. Tsvyashchenko


We present studies of neutron diffraction, electrical resistivity, magnetic susceptibility, magnetization, and specific heat of noncentrosymmetric $\mathrm{Yb}\mathrm{Ni}{\mathrm{C}}_{2}$. At normal pressure, $\mathrm{Yb}\mathrm{Ni}{\mathrm{C}}_{2}$ is a moderate heavy-fermion compound with Kondo la...


[Phys. Rev. B 103, 235139] Published Wed Jun 16, 2021
16 Jun 2021 at 12:00pm
Hydrostaticity in high pressure experiments: some general observations and guidelines for high pressure experimenters
by K. Takemura
Volume 41, Issue 2, June 2021, Page 155-174
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25 Mar 2021 at 6:06am
Nonstoichiometric Fe–V–Al full Heusler alloys under high pressure: thermoelectric properties
by I. V. Korobeynikov
Volume 41, Issue 2, June 2021, Page 184-197
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15 May 2021 at 9:44am
Using high hydrostatic pressure as an abiotic elicitor strategy for improving capsaicin production in free and immobilized cell suspension cultures of Capsicum annuum L.
by Cemil İşlek
Volume 41, Issue 2, June 2021, Page 198-208
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25 Mar 2021 at 6:03am
Continuous measurement of ultrasonic elastic wave velocities, X-ray radiography and X-ray diffraction of Zr50Cu40Al10 metallic glass at high pressure and high temperature conditions
by Yoshio Kono
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21 Jun 2021 at 8:59am
Scientists might have spotted tectonic activity inside Venus
by Neel V. Patel
Venus might be hell, but don’t call it a dead planet. Amid surface temperatures of up to 471 °C and surface pressures 100 times greater than those on Earth, new research suggests the planet might still be geologically active. That’s encouraging news to people who think it could once have hosted life (or that it might still…
21 Jun 2021 at 9:00pm