scholarly journals Picosecond Acoustics Technique to Measure the Sound Velocities of Fe-Si Alloys and Si Single-Crystals at High Pressure

Minerals ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 214 ◽  
Author(s):  
Eric Edmund ◽  
Michel Gauthier ◽  
Daniele Antonangeli ◽  
Simon Ayrinhac ◽  
Silvia Boccato ◽  
...  
Keyword(s):  
High Pressure ◽  
Single Crystals ◽  
Acoustic Properties ◽  
Probe Laser ◽  
Laser Technique ◽  
Time Resolved ◽  
Pump Probe ◽  
Longitudinal Sound Velocity ◽  
Diamond Anvil ◽  
Complete Set

We describe here a time resolved pump-probe laser technique—picosecond interferometry—which has been combined with diamond anvil cells (DAC). This method enables the measurement of the longitudinal sound velocity up to Mbar pressure for any kind of material (solids, liquids, metals, insulators). We also provide a description of picosecond acoustics data analysis in order to determine the complete set of elastic constants for single crystals. To illustrate such capabilities, results are given on the pressure dependence of the acoustic properties for prototypical cases: polycrystal (hcp-Fe-5 wt% Si up to 115 GPa) and single-crystal (Si up to 10 GPa).

Femtosecond pump-probe characterization of high-pressure grown Al x Ga 1-x N single crystals

2009 ◽  
Author(s):  
Jie Zhang ◽  
A. Belousov ◽  
S. Katrych ◽  
J. Jun ◽  
J. Karpinski ◽  
...  
Keyword(s):  
High Pressure ◽  
Single Crystals ◽  
Pump Probe

Two-color pump-probe laser spectroscopy instrument with picosecond time-resolved electronic delay and extended scan range

2005 ◽  
Vol 76 (11) ◽  
pp. 114301 ◽  
Author(s):  
Anchi Yu ◽  
Xiong Ye ◽  
Dan Ionascu ◽  
Wenxiang Cao ◽  
Paul M. Champion
Keyword(s):  
Laser Spectroscopy ◽  
Probe Laser ◽  
Time Resolved ◽  
Pump Probe

Measurement of the Bulk Modulus of a Liquid Using a Pump?Probe Laser Technique

2001 ◽  
Vol 6 (4) ◽  
pp. 235-237 ◽  
Author(s):  
Christopher D. Lane ◽  
David J. Hathcock ◽  
Andrew J. Leavitt ◽  
Farooq A. Khan ◽  
John E. Hansen
Keyword(s):  
Bulk Modulus ◽  
Probe Laser ◽  
Laser Technique ◽  
Pump Probe

An Original Model Experiment Designed for High-Pressure Crystallization with a Polymer Processing Concern

2013 ◽  
Vol 554-557 ◽  
pp. 1592-1601
Author(s):  
Severine A.E. Boyer ◽  
Jean Marc Haudin
Keyword(s):  
High Pressure ◽  
Model Experiment ◽  
Polymer Processing ◽  
Original Model ◽  
Avrami Equation ◽  
Physical Analysis ◽  
Time Resolved ◽  
Diamond Anvil ◽  
Kinetics Of

A comprehensive understanding of the inherent link between in-situ growth kinetics of a polymer spherulite and high-pressure constraints under controlled temperature is concerned. As a matter of fact, while the link with temperature is well illustrated, little comprehensive study has been conducted to quantify the effect of pressure. This is yet required to model ‘extreme’ polymer processing conditions.Mainly, the experimental set-ups developed to reproduce the pressure effect can be classified into four families: “simple” cells, dilatometric set-ups, differential thermal analysis and diamond anvil plus in-situ measurement. In this context, an original model experiment, named CRISTAPRESS, has been constructed. The cell design exploits the optical properties of semi-crystalline spherulites. Time-resolved light depolarizing microscopic observations are conducted concomitantly with a fine PVT control, for high pressure up to 200 MPa and temperature up to 300 °C. The physical analysis of isothermal and isobaric holding of a model polymer shows the influence of temperature and pressure on the key kinetic parameters of crystallization, i.e., the growth rate and the number of activated nuclei, as well as on the subsequent morphologies. Simple modeling dealing with the Avrami equation and the Hoffman & Lauritzen theory is established.

Facilitating preparation of gaskets for routine high-pressure diffraction studies

1999 ◽  
Vol 32 (5) ◽  
pp. 1021-1023 ◽  
Author(s):  
Andrzej Katrusiak
Keyword(s):  
High Pressure ◽  
Single Crystals ◽  
Effective Procedure ◽  
Diamond Anvil Cells ◽  
Diamond Anvil

Preparation of gaskets for high-pressure diffraction studies can be considerably facilitated by modifying the procedure of loading single crystals or powders into diamond-anvil cells. An effective procedure of pre-indenting gaskets after drilling the holes and a simple spark eroder for preparing the gaskets in the laboratory are described.

Pressure-induced phase transitions of piezoelectric single crystals from the langasite family: La3Nb0.5Ga5.5O14 and La3Ta0.5Ga5.5O14

2002 ◽  
Vol 58 (6) ◽  
pp. 939-947 ◽  
Author(s):  
A. Pavlovska ◽  
S. Werner ◽  
B. Maximov ◽  
B. Mill
Keyword(s):  
High Pressure ◽  
Single Crystals ◽  
Initial Phase ◽  
Hydrostatic Compression ◽  
X Ray Diffraction ◽  
Space Group ◽  
X Ray ◽  
Diamond Anvil ◽  
Internal Strains ◽  
Reflection Intensity

The hydrostatic compression of piezoelectric single crystals of La3Nb0.5Ga5.5O14 (LNG) and La3Ta0.5Ga5.5O14 (LTG) was studied at pressures of up to 23 GPa in diamond-anvil high-pressure cells using single-crystal X-ray diffraction techniques. The reflection-intensity data for LNG and LTG were collected at pressures of up to 22.8 GPa and 16.7 GPa, respectively. Both compounds show anisotropic behaviour under pressure, which is caused by differences in bonding parallel to the a and c directions. The compression of strongly rigid structures leads to increasing internal strains and results, at pressures of 12.4 (3) GPa for LNG and 11.7 (3) GPa for LTG, in a transition to lower symmetry. The compressibilities along the c axis are almost the same for LNG and LTG through the whole investigated pressure range. In contrast, the pressure dependencies of the a axis of these materials are similar only for the initial phase, and the axial compressibilities for the high-pressure polymorphs of LNG and LTG are significantly different to each other. The volume compressibilities of trigonal LNG and LTG (space group P321) are about 0.007 GPa−1; respective bulk moduli are 145 (3) GPa and 144 (2) GPa. The monoclinic high-pressure phases (space group A2) of LNG and LTG show differing compressions, which can be explained by the substitution of Ta5+ for Nb5+. Thus, the bulk moduli for the high-pressure polymorphs of LNG and LTG are B 0 = 93 (2) GPa and B 0 = 128 (12) GPa, respectively. The volume compressibilities of the high-pressure phases at 0.011 GPa−1 for LNG and 0.008 GPa−1 for LTG are higher than the initial phases, this effect being more pronounced in the case of LNG.

Time-resolved femtosecond optical characterization of multi-photon absorption in high-pressure-grown Al0.86Ga0.14N single crystals

2011 ◽  
Vol 110 (11) ◽  
pp. 113112 ◽  
Author(s):  
Jie Zhang ◽  
Andrey Belousov ◽  
Janusz Karpiński ◽  
Bertram Batlogg ◽  
Gary Wicks ◽  
...  
Keyword(s):  
High Pressure ◽  
Single Crystals ◽  
Optical Characterization ◽  
Photon Absorption ◽  
Time Resolved
Sign in / Sign up

Export Citation Format

Share Document