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

Edmund, Eric; Gauthier, Michel; Antonangeli, Daniele; Ayrinhac, Simon; Boccato, Silvia; Deletang, Thibault; Morand, Marc; Garino, Y.; Parisiades, Paraskevas; Decremps, F.

doi:10.3390/min10030214

Cited by 4 publications

(4 citation statements)

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“…The main motivation driving the upgrade was to extend the application of picosecond acoustics to pressures in the Mbar range coupled with temperatures exceeding 1500 K, but also to perform picosecond acoustics experiments at P-T conditions already routinely accessible in our previous setup (e.g. [2,7,[10][11][12][13][14][15][16]) on cases that could benefit from an improved acquisition speed and stability of the system.…”

Section: Discussionmentioning

confidence: 99%

“…Up to now, picosecond acoustic has been used at ambient temperature and high pressure conditions up to 150 GPa on polycrytalline samples compressed in a DAC measuring the sound velocities of Fe [7], H 2 [8], Fe-Ni alloys [9] and Fe-Si alloys [10,11]. Measurements on single crystals allowed determining the complete elastic tensor of Si up to 8 GPa [2].…”

Section: Introductionmentioning

confidence: 99%

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Picosecond acoustics: a new way to access elastic properties of materials at pressure and temperature conditions of planetary interiors

et al. 2022

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Picosecond acoustics is an optical pump-probe technique allowing to access thermoelastic properties and sound velocities of a large variety of materials under extreme conditions. Coupled with diamond anvil cells and laser heating, picosecond acoustic measurements offer the possibility to probe materials over a pressure and temperature range directly pertinent for the deep planetary interiors. In this paper we highlight the capabilities and versatility of this technique by presenting some recent applications on materials of geophysical interest. All the independent components of the elastic tensor of MgO are simultaneously determined Picosecond acoustics: elastic properties under extreme conditions by measurements on single crystal at ambient conditions. Compressional sound velocity is measured at high pressure on an iron-carbon alloy and on polycrystalline argon. First laser heating test measurements performed on molybdenum at high pressure are also presented. These examples demonstrate that picosecond acoustics is a valuable alternative to already existing techniques for determining the physical properties of samples under extreme pressure and temperature conditions.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Picosecond acoustics: a new way to access elastic properties of materials at pressure and temperature conditions of planetary interiors

et al. 2022

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“…In situ measurements of the thickness of these films could be important to test the model of thickness changes during compression used in such studies (Chen et al, 2011;Hsieh et al, 2017Hsieh et al, , 2018Hsieh et al, , 2020Marzotto et al, 2020). Likewise, in situ measurement of thickness of metal films on substrates could be important to test the isotropic model of thickness change assumed in picosecond acoustics experiments (Decremps et al, 2014;Edmund et al, 2020). Sample thickness is also essential for the spectroscopic determination of optical absorption coefficients, which serve as primary input for estimates of radiative thermal conductivity (Goncharov et al, 2006(Goncharov et al, , 2008(Goncharov et al, , 2015Keppler et al, 2008;Lobanov et al, 2017Lobanov et al, , 2020Lobanov et al, , 2021Murakami et al, 2014Murakami et al, , 2022Thomas et al, 2012).…”

Section: Discussionmentioning

confidence: 99%

Non‐Isotropic Contraction and Expansion of Samples in Diamond Anvil Cells: Implications for Thermal Conductivity at the Core‐Mantle Boundary

Lobanov

Geballe

2022

Geophysical Research Letters

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The thermal conductivities of mantle and core materials have a major impact on planetary evolution, but their experimental determination requires precise knowledge of sample thickness at high pressure. Despite its importance, thickness in most diamond anvil cell (DAC) experiments is not measured but inferred from equations of state, assuming isotropic contraction upon compression or assuming isotropic expansion upon decompression. Here we provide evidence that in DAC experiments both assumptions are invalid for a range of mechanically diverse materials (KCl, NaCl, Ar, MgO, silica glass, Al2O3). Upon compression, these samples are ∼30–50% thinner than expected from isotropic contraction. Most surprisingly, all the studied samples continue to thin upon decompression to 10–20 GPa. Our results partially explain some discrepancies among the highly controversial thermal conductivity values of iron at Earth's core conditions. More generally, we suggest that in situ characterization of sample geometry is essential for conductivity measurements at high pressure.

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“…PSU is mostly limited to opaque materials, and if transparent samples (including silicates) are studied experiments are essentially analogous to time-domain Brillouin Scattering 43 . Applications of PSU have so far been restricted to relatively low temperatures, but extension to mantle temperatures appears possible 44 .…”

Section: Measurement Techniquesmentioning

confidence: 99%

Experimental elasticity of Earth’s deep mantle

Marquardt

Thomson

2020

Nat Rev Earth Environ

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Remote sensing by seismology provides increasingly detailed views on the seismic wave velocity structure of Earth's deep mantle. The interpretation of these observations critically relies on quantitative knowledge of the elastic properties of Earth's mantle minerals. This knowledge comes largely from experimental in-situ measurements of sound wave velocities of mantle minerals at high-pressure/-temperature, a field that has significantly evolved within the past decade. In this Technical Review, we highlight the major methodologies employed and discuss their advantages, limitations and future potential. We focus on light scattering techniques in the diamond-anvil cell and ultrasonic methods in large volume presses since these techniques have provided -and likely will provide -the majority of elasticity data on deep mantle minerals in the foreseeable future. We summarize the current state of knowledge with respect to the elastic properties of the minerals making up the transition zone and lower mantle, where substantial advances have been recently made, and highlight major gaps in published data.

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

Cited by 4 publications

References 47 publications

Picosecond acoustics: a new way to access elastic properties of materials at pressure and temperature conditions of planetary interiors

Picosecond acoustics: a new way to access elastic properties of materials at pressure and temperature conditions of planetary interiors

Non‐Isotropic Contraction and Expansion of Samples in Diamond Anvil Cells: Implications for Thermal Conductivity at the Core‐Mantle Boundary

Experimental elasticity of Earth’s deep mantle

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