New method of high-pressure Brillouin studies for elastic properties of molecular single-crystals grown in a diamond-anvil cell

1994 ◽  
Author(s):  
Hiroyasu Shimizu ◽  
Shigeo Sasaki
Keyword(s):  
High Pressure ◽  
Single Crystals ◽  
Elastic Properties ◽  
Diamond Anvil Cell ◽  
New Method ◽  
Diamond Anvil

scholarly journals Effects of Composition, Pressure, and Temperature on the Elastic Properties of SiO2–TiO2 Glasses: An Integrated Ultrasonic and Brillouin Study

Minerals ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 481
Author(s):  
Murli H. Manghnani ◽  
Quentin Williams ◽  
Teruyuki Matsui ◽  
Peter C. Schultz ◽  
Charles R. Kurkjian
Keyword(s):  
High Pressure ◽  
Elastic Properties ◽  
Excellent Agreement ◽  
Diamond Anvil Cell ◽  
Brillouin Scattering ◽  
Elastic Behavior ◽  
Tio2 Content ◽  
Diamond Anvil ◽  
Raman Study ◽  
Low Pressures

We have systematically investigated the elastic properties (ρ, VP, VS, K, μ and σ) of eight SiO2–TiO2 glasses, varying in composition from 1.3 to 14.7 wt% TiO2, as a function of pressure up to 0.5 GPa by the pulse superposition (PSP) ultrasonic technique, and two compositions (1.3 and 9.4 wt% TiO2) up to ~5.7 GPa by Brillouin scattering in a diamond anvil cell. The parameters were also measured after annealing to 1020 °C. Composition–elasticity relationships, except for K and σ, are more or less linear; the annealing simply makes the relationships more uniform (less scatter). There is excellent agreement between the ultrasonic and Brillouin measurements at ambient and high pressure. The pressure-induced anomalous elastic behavior (negative dVP/dP and dK/dP) becomes more negative (more compressible) with the increasing TiO2 content. Correspondingly, the acoustic Grüneisen parameters become more negative with increases in the TiO2 content, reaching a minimum near ~8–10 wt% TiO2. The comparison of the low- and high-pressure ultrasonic and Brillouin VP and VS in two glasses (1.3 and 9.4 wt% TiO2) shows excellent agreement, defining the reversible elastic behavior at low pressures and irreversible behavior at higher pressures (≥5.7 GPa) well. This result is consistent with our previous high-pressure Raman study showing an irreversible structural change in a similar pressure range.

Structure of solid chlorine at 1.45 GPa

2019 ◽  
Vol 234 (4) ◽  
pp. 277-280 ◽  
Author(s):  
Laura Henry ◽  
Volodymyr Svitlyk ◽  
Gaston Garbarino ◽  
David Sifre ◽  
Mohamed Mezouar
Keyword(s):  
High Pressure ◽  
Low Temperature ◽  
Single Crystal ◽  
Single Crystals ◽  
Room Temperature ◽  
Diamond Anvil Cell ◽  
Ambient Pressure ◽  
Orthorhombic Symmetry ◽  
Single Crystal Diffraction ◽  
Diamond Anvil

Abstract Single crystals of solid chlorine (Cl2) were synthesized at room temperature and high pressure (HP, P=1.45 GPa) in a diamond anvil cell (DAC). At these conditions Cl2 adapts the same structure as its corresponding low-temperature (LT) ambient pressure modification (T<172 K), as concluded from HP single crystal diffraction experiments. Namely, it crystallizes in an orthorhombic symmetry (Cmce spacegroup) with Cl2 molecules forming monolayers parallel to the bc plane and this structure is preserved up to at least 64 GPa. The pressure of 1.45 GPa is to be considered as a solidification point of liquid Cl2 at room temperature.

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.

New method for measuring electrical conductivities of solids in a diamond anvil cell

1978 ◽  
Vol 49 (11) ◽  
pp. 1557-1558 ◽  
Author(s):  
Priscilla La Bonville Walling ◽  
John R. Ferraro
Keyword(s):  
Diamond Anvil Cell ◽  
New Method ◽  
Electrical Conductivities ◽  
Diamond Anvil
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