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.

Leveraging change: the power of peer pressure
by Thomas Dietz


Nature, Published online: 20 January 2020; doi:10.1038/d41586-020-00111-7

Social context affects how we act on issues such as climate change. Policymakers ignore it at their peril, a book argues. By Thomas Dietz.
20 Jan 2020 at 12:00am
Stress, anxiety, harassment: huge survey reveals pressures of scientists’ working lives
by Alison Abbott


Nature, Published online: 15 January 2020; doi:10.1038/d41586-020-00101-9

Global study highlights long hours, poor job security and mental-health struggles.
15 Jan 2020 at 12:00am
A high-resolution summary of Cambrian to Early Triassic marine invertebrate biodiversity
by Fan, J.-x., Shen, S.-z., Erwin, D. H., Sadler, P. M., MacLeod, N., Cheng, Q.-m., Hou, X.-d., Yang, J., Wang, X.-d., Wang, Y., Zhang, H., Chen, X., Li, G.-x., Zhang, Y.-c., Shi, Y.-k., Yuan, D.-x., Chen, Q., Zhang, L.-n., Li, C., Zhao, Y.-y.


One great challenge in understanding the history of life is resolving the influence of environmental change on biodiversity. Simulated annealing and genetic algorithms were used to synthesize data from 11,000 marine fossil species, collected from more than 3000 stratigraphic sections, to generate a new Cambrian to Triassic biodiversity curve with an imputed temporal resolution of 26 ± 14.9 thousand years. This increased resolution clarifies the timing of known diversification and extinction events. Comparative analysis suggests that partial pressure of carbon dioxide (Pco2) is the only environmental factor that seems to display a secular pattern similar to that of biodiversity, but this similarity was not confirmed when autocorrelation within that time series was analyzed by detrending. These results demonstrate that fossil data can provide the temporal and taxonomic resolutions necessary to test (paleo)biological hypotheses at a level of detail approaching those of long-term ecological analyses.


16 Jan 2020 at 7:39pm
How methane hydrate recovers at very high pressure the hexagonal ice structure
by S. Schaack
The Journal of Chemical Physics, Volume 152, Issue 2, January 2020.
Methane hydrate was recently shown, both experimentally and through simulations, to be stable up to the remarkably high pressure of 150 GPa. A new methane hydrate high-pressure (MH-IV) phase, reminiscent of ice at ambient pressure, was described for pressures above approximately 40 GPa. We disentangle here the main contributions to the relative stability of the lower pressure, denoted MH-III, and the high-pressure MH-IV structures. Through several simulation techniques, including metadynamics and path integral molecular dynamics for nuclear quantum effects, we analyze the phase transition mechanism, which implies hydrogen bond breaking and reforming, as well as methane reordering. The transition pathway is far from trivial, and the quantum delocalization of the hydrogen nuclei plays a significant role.
13 Jan 2020 at 1:50pm
Highly sensitive pressure and temperature induced SPP resonance shift at gold nanohole arrays
by Hiroki Ohnishi
The Journal of Chemical Physics, Volume 152, Issue 2, January 2020.
Short range ordered (SRO) plasmonic nanohole arrays have a distinct surface plasmon polariton resonance in the visible region and exhibit an excellent sensing capability toward changes in the surrounding refractive index. While SRO and perfectly ordered plasmonic hole arrays have similar sensing properties, SRO arrays have clear advantages in fabrication, simplicity, and scalability. In this study, we use SRO gold nanoholes, which are subjected to pressure and temperature cycles, for vacuum and temperature sensing. The response of the transmission spectra to pressure changes in the range 10−3–105 Pa and temperature scans in the range 20–400 °C was recorded. Upon pressure cycling, a reversible response was observed. Upon initial temperature annealing, an irreversible blue shift in the resonance dip position was observed. Upon further temperature cycling, the resonance dip position shifts reversibly, with a notable red shift upon temperature increase. The results are discussed and interpreted based on possible molecular adsorption/desorption upon pressure cycling and in terms of the gold film’s recrystallization, thermal expansion, and free electron density variations.
10 Jan 2020 at 4:24am
Nonuniform Electro-osmotic Flow Drives Fluid-Structure Instability
by Evgeniy Boyko, Ran Eshel, Amir D. Gat, and Moran Bercovici
Author(s): Evgeniy Boyko, Ran Eshel, Amir D. Gat, and Moran Bercovici


We demonstrate the existence of a fluid-structure instability arising from the interaction of electro-osmotic flow with an elastic substrate. Considering the case of flow within a soft fluidic chamber, we show that above a certain electric field threshold, negative gauge pressure induced by electro-...


[Phys. Rev. Lett. 124, 024501] Published Tue Jan 14, 2020
14 Jan 2020 at 11:00am
Absolute Measurement of Laser Ionization Yield in Atmospheric Pressure Range Gases over 14 Decades
by D. Woodbury, R. M. Schwartz, E. Rockafellow, J. K. Wahlstrand, and H. M. Milchberg
Author(s): D. Woodbury, R. M. Schwartz, E. Rockafellow, J. K. Wahlstrand, and H. M. Milchberg


Laser ionization yield of dense gases confirms the model of isolated molecules and the importance of contaminants, but not of many-body effects under those conditions.


[Phys. Rev. Lett. 124, 013201] Published Mon Jan 06, 2020
6 Jan 2020 at 11:00am
Real-Time Observation of Stacking Faults in Gold Shock Compressed to 150 GPa
by Surinder M. Sharma, Stefan J. Turneaure, J. M. Winey, P. A. Rigg, N. Sinclair, Xiaoming Wang, Y. Toyoda, and Y. M. Gupta
Author(s): Surinder M. Sharma, Stefan J. Turneaure, J. M. Winey, P. A. Rigg, N. Sinclair, Xiaoming Wang, Y. Toyoda, and Y. M. Gupta


A new experimental approach reveals, for the first time, the formation of microstructural defects in gold when shock compressed to high pressure, a critical insight to understanding shocked states of materials.


[Phys. Rev. X 10, 011010] Published Wed Jan 15, 2020
15 Jan 2020 at 11:00am
Critical Phenomena in the Temperature-Pressure-Crowding Phase Diagram of a Protein
by Andrei G. Gasic, Mayank M. Boob, Maxim B. Prigozhin, Dirar Homouz, Caleb M. Daugherty, Martin Gruebele, and Margaret S. Cheung
Author(s): Andrei G. Gasic, Mayank M. Boob, Maxim B. Prigozhin, Dirar Homouz, Caleb M. Daugherty, Martin Gruebele, and Margaret S. Cheung


Proteins balance contradictory demands of folding tightly yet remaining flexible by tuning where they operate in a temperature-pressure-crowding phase diagram.


[Phys. Rev. X 9, 041035] Published Mon Nov 18, 2019
18 Nov 2019 at 11:00am
Solids, liquids, and gases under high pressure
by Ho-Kwang Mao, Xiao-Jia Chen, Yang Ding, Bing Li, and Lin Wang
Author(s): Ho-Kwang Mao, Xiao-Jia Chen, Yang Ding, Bing Li, and Lin Wang


The effect of adding high pressure as a control parameter in solids, liquids, and gases expands opportunities to observe unexpected novel phenomena and understand matter in extreme environments. This review on high pressure science highlights subjects ranging from quantum criticality to Earth science. State-of-the-art experimental methods at megabar pressures are also discussed. The proliferation of pressure-induced phases illustrate promising new directions for this field of research.


[Rev. Mod. Phys. 90, 015007] Published Tue Mar 20, 2018
20 Mar 2018 at 11:00am
Colloquium: High pressure and road to room temperature superconductivity
by Lev P. Gor’kov and Vladimir Z. Kresin
Author(s): Lev P. Gor’kov and Vladimir Z. Kresin


Even after three decades of development, high-temperature superconductivity remains one of the most challenging theoretical and experimental areas in condensed matter physics. In this Colloquium some new discoveries in this area are reviewed and possible routes toward much higher transition temperatures are analyzed.


[Rev. Mod. Phys. 90, 011001] Published Tue Jan 09, 2018
9 Jan 2018 at 11:00am
Effect of chemical and hydrostatic pressure on the coupled magnetostructural transition of Ni-Mn-In Heusler alloys
by P. Devi, C. Salazar Mejía, L. Caron, Sanjay Singh, M. Nicklas, and C. Felser
Author(s): P. Devi, C. Salazar Mejía, L. Caron, Sanjay Singh, M. Nicklas, and C. Felser


Ni-Mn-In magnetic shape-memory Heusler alloys exhibit generally a large thermal hysteresis at their first-order martensitic phase transition which hinders a technological application in magnetic refrigeration. By optimizing the Cu content in ${\mathrm{Ni}}_{2}{\mathrm{Cu}}_{x}{\mathrm{Mn}}_{1.4−x}{\...


[Phys. Rev. Materials 3, 122401(R)] Published Tue Dec 10, 2019
10 Dec 2019 at 11:00am
Ab initio exploration of post-PPV transitions in low-pressure analogs of ${\mathrm{MgSiO}}_{3}$
by Koichiro Umemoto and Renata M. Wentzcovitch
Author(s): Koichiro Umemoto and Renata M. Wentzcovitch


Here, we present an ab initio investigation of the pressure-induced behavior of ${\mathrm{MgGeO}}_{3}$ and ${\mathrm{NaMgF}}_{3}$ perovskite (PV), traditional low-pressure analogs (LPAs) of ${\mathrm{MgSiO}}_{3}$ PV. The latter is an exceedingly important system in planetary sciences displaying nove...


[Phys. Rev. Materials 3, 123601] Published Tue Dec 03, 2019
3 Dec 2019 at 11:00am
Strain stiffening, high load-invariant hardness, and electronic anomalies of boron phosphide under pressure
by Rui Gui, Zhe Xue, Xuefeng Zhou, Chao Gu, Xiangting Ren, Hu Cheng, Dejiang Ma, Jiaqian Qin, Yongcheng Liang, Xiaozhi Yan, Jianzhong Zhang, Xinyu Zhang, Xiaohui Yu, Liping Wang, Yusheng Zhao, and Shanmin Wang
Author(s): Rui Gui, Zhe Xue, Xuefeng Zhou, Chao Gu, Xiangting Ren, Hu Cheng, Dejiang Ma, Jiaqian Qin, Yongcheng Liang, Xiaozhi Yan, Jianzhong Zhang, Xinyu Zhang, Xiaohui Yu, Liping Wang, Yusheng Zhao, and Shanmin Wang


New refractory hard materials with a favorable band gap are in high demand for the next-generation semiconductors capable of withstanding high temperature and other hostile environments. Boron phosphide (BP) is such an attractive candidate with exceptional properties; however, it has mainly been stu...


[Phys. Rev. B 101, 035302] Published Wed Jan 15, 2020
15 Jan 2020 at 11:00am
Magnetic phase diagram of ${ɛ}^{′}$-FeH
by Jianjun Ying, Jiyong Zhao, Wenli Bi, E. Ercan Alp, Yuming Xiao, Paul Chow, Guoyin Shen, and Viktor V. Struzhkin
Author(s): Jianjun Ying, Jiyong Zhao, Wenli Bi, E. Ercan Alp, Yuming Xiao, Paul Chow, Guoyin Shen, and Viktor V. Struzhkin


Iron hydrides attract significant interest as candidates for the main constituents of the Earth's core in geophysics and planetary science. However, their basic physical properties are still not well known. Here, we combined high-pressure transport, synchrotron radiation Mössbauer, and Fe $Kβ$ x-ray...


[Phys. Rev. B 101, 020405(R)] Published Tue Jan 14, 2020
14 Jan 2020 at 11:00am
Pressure-induced electronic and isostructural phase transitions in PdPS: Raman, x-ray, and first-principles study
by Satyendra Nath Gupta, Anjali Singh, Sujoy Sarkar, D. V. S. Muthu, Srinivasan Sampath, Umesh Waghmare, and A. K. Sood
Author(s): Satyendra Nath Gupta, Anjali Singh, Sujoy Sarkar, D. V. S. Muthu, Srinivasan Sampath, Umesh Waghmare, and A. K. Sood


Application of pressure is known to be an effective tool for tuning structural and electronic properties of transition metal dichalcogenides. In this work we present evolution of PdPS with pressure using Raman spectroscopy and synchrotron x-ray diffraction up to 26 GPa, complemented with first-princ...


[Phys. Rev. B 101, 035123] Published Tue Jan 14, 2020
14 Jan 2020 at 11:00am
Isoelectronic tuning of heavy fermion systems: Proposal to synthesize ${\mathrm{Ce}}_{3}{\mathrm{Sb}}_{4}{\mathrm{Pd}}_{3}$
by Jan M. Tomczak
Author(s): Jan M. Tomczak


The study of (quantum) phase transitions in heavy fermion compounds relies on a detailed understanding of the microscopic control parameters that induce them. While the influence of external pressure is rather straightforward, atomic substitutions are more involved. Nonetheless, replacing an element...


[Phys. Rev. B 101, 035116] Published Mon Jan 13, 2020
13 Jan 2020 at 11:00am
Lattice distortion-induced sluggish phase transition in CoCrFeNixAl1-x (x = 0.5, 0.75) high-entropy alloys at high pressures
by Lei Liu
Volume 39, Issue 4, December 2019, Page 533-546
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2 Oct 2019 at 9:00am
High-temperature electrical resistivity measurements of hcp iron to Mbar pressure in an internally resistive heated diamond anvil cell
by Sho Suehiro
Volume 39, Issue 4, December 2019, Page 579-587
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2 Oct 2019 at 9:00am
TiSi2-SiC agglomerates toughened TiC composites prepared by in-situ reaction under high pressure
by Qingyun Chen
Volume 39, Issue 4, December 2019, Page 598-607
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2 Oct 2019 at 9:00am
Hydrostaticity of pressure-transmitting media for high pressure infrared spectroscopy
by A. Celeste
Volume 39, Issue 4, December 2019, Page 608-618
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2 Oct 2019 at 9:00am
The application of manganin wire pressure gauges in a large volume press under high-temperature conditions
by Ren Dongsheng
Volume 39, Issue 4, December 2019, Page 619-627
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2 Oct 2019 at 9:00am
Parallel background subtraction in diamond anvil cells for high pressure X-ray data analysis
by Weizhao Cai
Volume 39, Issue 4, December 2019, Page 628-639
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2 Oct 2019 at 9:00am
High pressure influence on the Diels–Alder reaction volume in the solid phase at pressure up to 7000 bar and in solution
by Dmitry A. Kornilov
Volume 39, Issue 4, December 2019, Page 640-654
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2 Oct 2019 at 9:00am
Enhancing the pressure limitation in large-volume Bridgman-anvil cell used for in situ neutron diffraction
by Qiwei Hu
Volume 39, Issue 4, December 2019, Page 655-665
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2 Oct 2019 at 9:00am
High hydrostatic pressure processing of beetroot juice: effects on nutritional, sensory and microbiological quality
by Marta Ubeira-Iglesias
Volume 39, Issue 4, December 2019, Page 691-706
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2 Oct 2019 at 9:00am
Recent progress in high pressure X-ray absorption spectroscopy studies at the ODE beamline
by Lucie Nataf
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Opposed type double stage cell for Mbar pressure experiment with large sample volume
by Yoshio Kono
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Changes of microflora in high pressure treated Indian white prawn (Fenneropenaeus indicus)
by J. Ginson
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Review: high pressure generation techniques beyond the limit of conventional diamond anvils
by Takehiko Yagi
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Synthesis of nano-polycrystalline diamond from glassy carbon at pressures up to 25 GPa
by Tetsuo Irifune
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Pressure effect on the electromotive force of the type R thermocouple
by Yu Nishihara
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Exploiting optical properties of nanopolycrystalline diamond in high pressure experiments
by J. Antonio Barreda-Argüeso
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An application of NPD to double-stage diamond anvil cells: XAS spectra of rhenium metal under high pressures above 300 GPa
by K. Kuramochi
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Data-driven exploration for pressure-induced superconductors using diamond anvil cell with boron-doped diamond electrodes and undoped diamond insulating layer
by Ryo Matsumoto
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High pressure atomic structure of Zr–Cu metallic glass via EXAFS spectroscopy and molecular dynamics simulations
by P. Dziegielewski
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High pressure generation in the Kawai-type multianvil apparatus equipped with sintered diamond anvils
by D. Yamazaki
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