Hydrostatic pressure effects on superconducting transition of nanostructured niobium highly strained by high-pressure torsion

2019 ◽  
Vol 125 (12) ◽  
pp. 125901 ◽  
Author(s):  
Masaki Mito ◽  
Yuichiro Kitamura ◽  
Takayuki Tajiri ◽  
Kazuma Nakamura ◽  
Ryo Shiraishi ◽  
...  
Keyword(s):  
High Pressure ◽  
Hydrostatic Pressure ◽  
High Pressure Torsion ◽  
Pressure Effects ◽  
Superconducting Transition ◽  
Highly Strained

scholarly journals Distinct superconducting properties and hydrostatic pressure effects in 2D α- and β-Mo2C crystal sheets

2020 ◽  
Vol 12 (1) ◽  
Author(s):  
Yunjie Fan ◽  
Chuan Xu ◽  
Xiang Liu ◽  
Chao Ma ◽  
Yuewei Yin ◽  
...  
Keyword(s):  
Transition Temperature ◽  
Hydrostatic Pressure ◽  
Electronic Properties ◽  
Superconducting Transition Temperature ◽  
Important Influence ◽  
Pressure Effects ◽  
Superconducting Transition ◽  
Superconducting Properties ◽  
Disordered Carbon

Abstract Recently, 2D Mo2C, a new member of the MXene family, has attracted much attention due to the exotic superconducting properties discovered in 2D α-Mo2C. Here, not only 2D α-Mo2C but also 2D β-Mo2C crystal sheets with distinct disordered carbon distributions were successfully grown. 2D β-Mo2C shows a much stronger superconductivity than 2D α-Mo2C, and their superconductivities have different hydrostatic pressure responses. The superconducting transition temperature Tc of 2D α-Mo2C shows a dome-shaped profile under pressure, implying the existence of two competing effects arising from phononic and electronic properties, while for 2D β-Mo2C, Tc decreases monotonically with increasing pressure, possibly due to phonon stiffening. These results indicate that the electronic properties have a more important influence on the superconductivity in 2D α-Mo2C compared to 2D β-Mo2C. The ordered and disordered carbon distributions in 2D α-Mo2C and β-Mo2C, respectively, may be the underlying origin for their different electronic and superconducting properties.

HIGH PRESSURE STUDIES OF SUPERCONDUCTING Ba1−xKxBiO3

1990 ◽  
Vol 04 (14) ◽  
pp. 935-944 ◽  
Author(s):  
Z.J. HUANG ◽  
C.Y. HUANG ◽  
P.H. HOR ◽  
R.L. MENG ◽  
Y.Q. WANG ◽  
...  
Keyword(s):  
High Pressure ◽  
Transition Temperature ◽  
Pressure Effects ◽  
Superconducting Transition ◽  
High Current ◽  
Applied Current ◽  
High Pressure Studies ◽  
Sample Resistance ◽  
State Resistance ◽  
Normal State Resistance

We have studied the pressure effects of superconducting Ba 1−x K x BiO 3 for x=0.25, 0.30, 0.35 and 0.40 up to ~16 kbar . The superconducting transition temperature, Tc, increases linearly with pressure, P. We have found that dTc/dP decreases with increasing Tc, and reaches ~0 around Tc~29 K. For the x=0.35 sample, resistance reappears below Tc for pressure >12 kbar. This resistance depends strongly on the applied current. It becomes greater than the normal state resistance and noisy at high current.

Texture Evolution of HPT-Processed Ni50Mn29Ga21

2011 ◽  
Vol 702-703 ◽  
pp. 169-172 ◽  
Author(s):  
Robert Chulist ◽  
Andrea Böhm ◽  
E. Rybacki ◽  
T. Lippmann ◽  
C.G. Oertel ◽  
...  
Keyword(s):  
High Pressure ◽  
Hydrostatic Pressure ◽  
Synchrotron Radiation ◽  
High Pressure Torsion ◽  
Electron Backscatter Diffraction ◽  
Texture Evolution ◽  
Residual Austenite ◽  
High Energy ◽  
Electron Backscatter ◽  
Backscatter Diffraction

The texture of polycrystalline Ni50Mn29Ga21alloys fabricated by high pressure torsion (HPT) was investigated with high-energy synchrotron radiation. HPT was performed at temperatures between 873K and 1173K under a hydrostatic pressure of 400 MPa. During HPT above 973K the initial cyclic fibre texture changes to a strong cube and a weak F component. Below 973K a strong rotated cube and weak F and C components develop. Additionally, electron backscatter diffraction reveals that samples deformed at low temperature do not completely transform to martensite giving rise to residual austenite.

scholarly journals Modelling of noble anaesthetic gases and high hydrostatic pressure effects in lipid bilayers

Soft Matter ◽  
2015 ◽  
Vol 11 (11) ◽  
pp. 2125-2138 ◽  
Author(s):  
Yevgeny Moskovitz ◽  
Hui Yang
Keyword(s):  
High Pressure ◽  
Hydrostatic Pressure ◽  
Lipid Bilayers ◽  
High Hydrostatic Pressure ◽  
Pressure Effects ◽  
Inert Gas ◽  
Molecular Processes ◽  
Anaesthetic Gases

Our objective was to study molecular processes that might be responsible for inert gas narcosis and high-pressure nervous syndrome.

scholarly journals Real Hydrostatic Pressure in High-Pressure Torsion Measured by Bismuth Phase Transformations and FEM Simulations

2016 ◽  
Vol 57 (4) ◽  
pp. 533-538 ◽  
Author(s):  
Kaveh Edalati ◽  
Dong Jun Lee ◽  
Takashi Nagaoka ◽  
Makoto Arita ◽  
Hyoung Seop Kim ◽  
...  
Keyword(s):  
High Pressure ◽  
Hydrostatic Pressure ◽  
Phase Transformations ◽  
High Pressure Torsion ◽  
Fem Simulations

scholarly journals Molecular Responses to High Hydrostatic Pressure in Eukaryotes: Genetic Insights from Studies on Saccharomyces cerevisiae

Biology ◽  
2021 ◽  
Vol 10 (12) ◽  
pp. 1305
Author(s):  
Fumiyoshi Abe
Keyword(s):  
Saccharomyces Cerevisiae ◽  
High Pressure ◽  
Hydrostatic Pressure ◽  
High Hydrostatic Pressure ◽  
High Pressures ◽  
Strong Association ◽  
Pressure Effects ◽  
Basic Knowledge ◽  
Challenger Deep ◽  
Human Joints

High hydrostatic pressure is common mechanical stress in nature and is also experienced by the human body. Organisms in the Challenger Deep of the Mariana Trench are habitually exposed to pressures up to 110 MPa. Human joints are intermittently exposed to hydrostatic pressures of 3–10 MPa. Pressures less than 50 MPa do not deform or kill the cells. However, high pressure can have various effects on the cell’s biological processes. Although Saccharomyces cerevisiae is not a deep-sea piezophile, it can be used to elucidate the molecular mechanism underlying the cell’s responses to high pressures by applying basic knowledge of the effects of pressure on industrial processes involving microorganisms. We have explored the genes associated with the growth of S. cerevisiae under high pressure by employing functional genomic strategies and transcriptomics analysis and indicated a strong association between high-pressure signaling and the cell’s response to nutrient availability. This review summarizes the occurrence and significance of high-pressure effects on complex metabolic and genetic networks in eukaryotic cells and how the cell responds to increasing pressure by particularly focusing on the physiology of S. cerevisiae at the molecular level. Mechanosensation in humans has also been discussed.

scholarly journals High hydrostatic pressure effects on arginine vasotocin levels in fish

2020 ◽  
Vol 29 ◽  
pp. 165-173
Author(s):  
A Rodríguez-Illamola ◽  
JM Míguez ◽  
J Coimbra ◽  
JM Wilson
Keyword(s):  
High Pressure ◽  
Hydrostatic Pressure ◽  
Fish Species ◽  
High Hydrostatic Pressure ◽  
Plasma Cortisol ◽  
Arginine Vasotocin ◽  
Pressure Effects ◽  
Freshwater Species ◽  
Short Term ◽  
Short Term Exposure

The present study investigates the response of the hormone arginine vasotocin (AVT), the non-mammalian antidiuretic hormone, to the acclimation of fish to high hydrostatic pressure (5.1 MPa). Two fish species with different osmoregulatory strategies, the lesser spotted dogfish Scyliorhinus canicula, a marine osmoconforming chondrichthyan species adapted for migration to deep waters, and the rainbow trout Oncorhynchus mykiss, a pressure-sensitive freshwater species, were selected for study. Fish were exposed to hydrostatic pressures of either 0.1 (control) or 5.1 MPa in hydrostatic chambers for up to 2 wk at their appropriate salinities. Plasma cortisol was measured in trout, and plasma chloride, sodium and potassium were measured in both fish species. A transient high level of plasma AVT was found in dogfish and in trout after 1 and 3 d of exposure to high hydrostatic pressure, which returned to basal levels by 14 d of exposure. In contrast, pituitary AVT content was reduced after short-term exposure in dogfish, while in trout, lower expression was found in high pressure than in control conditions, independently of exposure time. In dogfish, pituitary AVT levels recovered by 14 d under high hydrostatic pressure. No changes in plasma cortisol (trout) or ions (both species) were observed. These initial increases of the AVT release from the pituitary during fish acclimation to high pressure suggest that it works as a physiological short-term response to reduce water loss and equilibrate ion osmotic balance.

scholarly journals In-Situ Synchrotron Profile Analysis after High-Pressure Torsion Deformation

Crystals ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 232 ◽  
Author(s):  
Michael Kerber ◽  
Florian Spieckermann ◽  
Roman Schuster ◽  
Bertalan Joni ◽  
Norbert Schell ◽  
...  
Keyword(s):  
High Pressure ◽  
Hydrostatic Pressure ◽  
High Pressure Torsion ◽  
Profile Analysis ◽  
Heating Process ◽  
Line Profile Analysis ◽  
X Ray ◽  
Pressure Release ◽  
Induced Defects

The presence of hydrostatic pressure is a general crucial characteristic of severe plastic deformation methods for reaching high strains and for introducing large quantities of lattice defects, which are necessary to establish new grain boundaries. Insights into the processes occurring during deformation and the influence of hydrostatic pressure are necessary to help better understand the SPD methods. A special experimental procedure was designed to simulate the hydrostatic pressure release: High pressure torsion (HPT)-deformed microstructure changes related to the release of hydrostatic pressure after the HPT deformation of copper and nickel were studied by freezing the sample before releasing the pressure. High-resolution in-situ X-ray diffraction of the heating process was performed using synchrotron radiation in order to apply X-ray line profile analysis to analyze the pressure release. The results on copper and nickel generally indicated the influence of hydrostatic pressure on the mobility and interaction of deformation-induced defects as well as the resulting microstructure.

scholarly journals Amorphous-Nanocrystalline Composites Prepared by High-Pressure Torsion

Metals ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 511 ◽  
Author(s):  
Inga Permyakova ◽  
Alex Glezer
Keyword(s):  
Plastic Deformation ◽  
High Pressure ◽  
Hydrostatic Pressure ◽  
Severe Plastic Deformation ◽  
Amorphous Alloys ◽  
Preparation Method ◽  
High Pressure Torsion ◽  
Structure And Properties ◽  
Nanocrystalline Composites

This article presents systematic studies of the preparation method and the specific features of the changes in the structure and properties of amorphous-nanocrystalline composites formed from melt-quenched ribbons of iron- and cobalt-based amorphous alloys and the Cu-Nb crystalline nanolaminates by severe plastic deformation by torsion in the Bridgeman chamber at high quasi-hydrostatic pressure.

Sign in / Sign up

Export Citation Format

Share Document