Measurement of Physical Properties of Lubricants Under High Pressure by Brillouin Scattering in a Diamond Anvil Cell

1995 ◽  
Vol 117 (3) ◽  
pp. 519-523 ◽  
Author(s):  
Y. Nakamura ◽  
I. Fujishiro ◽  
K. Nishibe ◽  
H. Kawakami
Keyword(s):  
High Pressure ◽  
Shear Modulus ◽  
Sound Velocity ◽  
Diamond Anvil Cell ◽  
Brillouin Scattering ◽  
Transverse Mode ◽  
Thermodynamic Relation ◽  
Slope Change ◽  
Scattering Spectra ◽  
Diamond Anvil

Brillouin scattering spectra and their transverse mode were measured for paraffinic and naphthenic synthetic lubricants, employing a high-pressure diamond anvil cell (DAC). Sound velocity, density, refractive index, and shear modulus under high pressure were obtained. The density obtained from the thermodynamic relation was compared with that from Lorentz-Lorenz‘s formula. The densities were also compared with Dowson‘s density-pressure equation of lubricants. The sound velocity in the transverse mode and shear modulus were obtained for 5P4E up to 2.7 GPa. A slope change in the pressure-sound velocity diagram was confirmed at about 0.3 GPa, which may be associated with crystallizaton of 5P4E, observed through a diamond optical window in the DAC.

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.

Elastic moduli of NaCl by Brillouin scattering at high pressure in a diamond anvil cell

1976 ◽  
Vol 47 (8) ◽  
pp. 942-947 ◽  
Author(s):  
Charles H. Whitfield ◽  
Edward M. Brody ◽  
William A. Bassett
Keyword(s):  
High Pressure ◽  
Elastic Moduli ◽  
Diamond Anvil Cell ◽  
Brillouin Scattering ◽  
Diamond Anvil

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.

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