Construction of phase diagram up to 2 GPa and 200°C for thermo-reversible gel lubricants by diamond anvil cell

10.1002/ls.82 ◽  
2009 ◽  
Vol 21 (5) ◽  
pp. 183-192 ◽  
Author(s):  
Nobuyoshi Ohno ◽  
Sobahan Mia ◽  
Kenji Tateishi ◽  
Shigeki Morita ◽  
Yuji Shitara
Keyword(s):  
Phase Diagram ◽  
Diamond Anvil Cell ◽  
Diamond Anvil ◽  
Reversible Gel

scholarly journals High-pressure superconducting phase diagram of 6Li: Isotope effects in dense lithium

2014 ◽  
Vol 112 (1) ◽  
pp. 60-64 ◽  
Author(s):  
Anne Marie Schaeffer ◽  
Scott R. Temple ◽  
Jasmine K. Bishop ◽  
Shanti Deemyad
Keyword(s):  
Phase Diagram ◽  
Isotope Effect ◽  
Diamond Anvil Cell ◽  
Isotope Effects ◽  
Quantum Dynamic ◽  
Superconducting Phase ◽  
Superconducting Transition ◽  
Dynamic Effects ◽  
Lattice Quantum ◽  
Diamond Anvil

We measured the superconducting transition temperature of 6Li between 16 and 26 GPa, and report the lightest system to exhibit superconductivity to date. The superconducting phase diagram of 6Li is compared with that of 7Li through simultaneous measurement in a diamond anvil cell (DAC). Below 21 GPa, Li exhibits a direct (the superconducting coefficient, α, Tc∝M−α, is positive), but unusually large isotope effect, whereas between 21 and 26 GPa, lithium shows an inverse superconducting isotope effect. The unusual dependence of the superconducting phase diagram of lithium on its atomic mass opens up the question of whether the lattice quantum dynamic effects dominate the low-temperature properties of dense lithium.

scholarly journals High pressure polymorphism of LiBH4 and of NaBH4

RSC Advances ◽  
2021 ◽  
Vol 11 (41) ◽  
pp. 25274-25283
Author(s):  
Adrien Marizy ◽  
Grégory Geneste ◽  
Gaston Garbarino ◽  
Paul Loubeyre
Keyword(s):  
Phase Diagram ◽  
Density Functional Theory ◽  
High Pressure ◽  
Density Functional ◽  
Diamond Anvil Cell ◽  
Density Functional Theory Calculations ◽  
Functional Theory ◽  
Diamond Anvil

Diamond anvil cell experiments are used along with density functional theory calculations to extend the phase diagram of LiBH4 & NaBH4 and explore new NaBH4(H2)x compounds at Mbar pressures.

High-Pressure Viscometry and Dilatometry for Lubricant Oils in a Diamond Anvil Cell Up to 6 GPa

2005 ◽  
Author(s):  
Yuichi Nakamura ◽  
Kazuyuki Sanda ◽  
Hideki Matsubo
Keyword(s):  
Phase Diagram ◽  
High Pressure ◽  
Diamond Anvil Cell ◽  
Pressure Coefficient ◽  
Simple Expression ◽  
Temperature Phase ◽  
Falling Sphere ◽  
Diamond Anvil ◽  
Lubricant Viscosity ◽  
Temperature Phase Diagram

To measure the properties of lubricant under high pressure, a diamond-anvil pressure cell was employed. With a falling sphere viscometry, viscosities were measured up to 2 GPa at up to 200 °C for traction oils. The results showed linearity between logarithmic viscosity and pressure at any temperatures. At 200 °C, lubricant viscosity-pressure coefficient fell to between 1/4 and 1/3rd of the value at 40°C. A simple expression for the dependence of high pressure viscosity on temperature has been suggested. Pressure temperature phase diagram of liquid-solid transition was plotted from the obtained viscosity. The change in volume due to solidification was estimated up to 6 GPa.

scholarly journals Bulk modulus of H2O across the ice VII–ice X transition measured by time-resolved x-ray diffraction in dynamic diamond anvil cell experiments

2021 ◽  
Vol 103 (6) ◽  
Author(s):  
A. S. J. Méndez ◽  
F. Trybel ◽  
R. J. Husband ◽  
G. Steinle-Neumann ◽  
H.-P. Liermann ◽  
...  
Keyword(s):  
Bulk Modulus ◽  
Diamond Anvil Cell ◽  
X Ray Diffraction ◽  
Time Resolved ◽  
X Ray ◽  
Diamond Anvil

High temperature diamond anvil cell with the laser heating

1989 ◽  
Vol 1 (5-6) ◽  
pp. 337-340 ◽  
Author(s):  
M. I. Eremets ◽  
V. V. Struzhkin ◽  
I. A. Trojan
Keyword(s):  
High Temperature ◽  
Laser Heating ◽  
Diamond Anvil Cell ◽  
Diamond Anvil

scholarly journals Phase transitions beyond post-perovskite in NaMgF3 to 160 GPa

2019 ◽  
Vol 116 (39) ◽  
pp. 19324-19329 ◽  
Author(s):  
Rajkrishna Dutta ◽  
Eran Greenberg ◽  
Vitali B. Prakapenka ◽  
Thomas S. Duffy
Keyword(s):  
Phase Transitions ◽  
Diamond Anvil Cell ◽  
Extrasolar Planets ◽  
High Pressures ◽  
Model System ◽  
Similar Sequence ◽  
Deep Interior ◽  
Diamond Anvil ◽  
Binary Compounds ◽  
Pressure Phase

Neighborite, NaMgF3, is used as a model system for understanding phase transitions in ABX3 systems (e.g., MgSiO3) at high pressures. Here we report diamond anvil cell experiments that identify the following phases in NaMgF3 with compression to 162 GPa: NaMgF3 (perovskite) → NaMgF3 (post-perovskite) → NaMgF3 (Sb2S3-type) → NaF (B2-type) + NaMg2F5 (P21/c) → NaF (B2) + MgF2 (cotunnite-type). Our results demonstrate the existence of an Sb2S3-type post-post-perovskite ABX3 phase. We also experimentally demonstrate the formation of the P21/c AB2X5 phase which has been proposed theoretically to be a common high-pressure phase in ABX3 systems. Our study provides an experimental observation of the full sequence of phase transitions from perovskite to post-perovskite to post-post-perovskite followed by 2-stage breakdown to binary compounds. Notably, a similar sequence of transitions is predicted to occur in MgSiO3 at ultrahigh pressures, where it has implications for the mineralogy and dynamics in the deep interior of large, rocky extrasolar planets.

scholarly journals The thermal conductivity of the Earth's core and implications for its thermal and compositional evolution

2020 ◽  
Author(s):  
Kenji Ohta ◽  
Kei Hirose
Keyword(s):  
Thermal Conductivity ◽  
High Pressure ◽  
Thermal History ◽  
Diamond Anvil Cell ◽  
High Pressures ◽  
Iron Alloys ◽  
Compositional Evolution ◽  
The Earth ◽  
Diamond Anvil ◽  
High Pressures And Temperatures

Abstract Precise determinations of the thermal conductivity of iron alloys at high pressures and temperatures are essential for understanding the thermal history and dynamics of the metallic cores of the Earth. We review relevant high-pressure experiments using a diamond-anvil cell and discuss implications of high core conductivity for its thermal and compositional evolution.

PHASE TRANSITION IN LAYERED PEROVSKITE LIKE MANGANATE Ca3Mn2O7 UNDER HIGH PRESSURE

2001 ◽  
Vol 15 (18) ◽  
pp. 2491-2497 ◽  
Author(s):  
J. L. ZHU ◽  
L. C. CHEN ◽  
R. C. YU ◽  
F. Y. LI ◽  
J. LIU ◽  
...  
Keyword(s):  
Crystal Structure ◽  
High Pressure ◽  
Diamond Anvil Cell ◽  
The Other ◽  
Layered Perovskite ◽  
X Ray Diffraction ◽  
Two Phase ◽  
X Ray ◽  
Diamond Anvil

In situ high pressure energy dispersive X-ray diffraction measurements on layered perovskite-like manganate Ca 3 Mn 2 O 7 under pressures up to 35 GPa have been performed by using diamond anvil cell with synchrotron radiation. The results show that the structure of layered perovskite-like manganate Ca 3 Mn 2 O 7 is unstable under pressure due to the easy compression of NaCl-type blocks. The structure of Ca 3 Mn 2 O 7 underwent two phase transitions under pressures in the range of 0~35 GPa. One was at about 1.3 GPa with the crystal structure changing from tetragonal to orthorhombic. The other was at about 9.5 GPa with the crystal structure changing from orthorhombic back to another tetragonal.

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