A model-potential approach for bismuth: II. behaviour under shock loading

Wetta, Nadine; Pélissier, J.

doi:10.1016/s0378-4371(00)00303-4

Cited by 15 publications

(5 citation statements)

References 10 publications

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“…5b). The particle velocity measured from the Bi/LiF interface indicates a later arrival of the first weak shock, which is consistent with the lower sound speed in liquid Bi, (1.65 km/s vs. 3.55 km/s in Cu) [18,19,20]. After three weak shocks in the Bi sample, the particle velocity continues to smoothly increase with the applied pressure, exhibiting all the same characteristics seen in the copper trace until approximately 1.2 µs, at which point the slope of the liquid Bi particle velocity flattens while the copper velocity continues to increase, suggesting the onset of the phase transition (point B in Fig.…”

Section: Resolidificationsupporting

confidence: 67%

“…Sound velocity in the solid phase is expected to be higher than that in the liquid phase at similar pressure due to the contribution of shear strength, which is non-existent in liquids. The sound velocity of liquid bismuth at ambient pressure (near the starting point of our experiments) is 1.65 km/s [18,19,20]) and for solid bcc-bismuth at approximately 0.1 Mbar on the Hugoniot (near the end point of our compression path), the sound velocity is 2.9 -3.1 km/s [19,25], suggesting that we should observe a large change in sound velocity upon resolidification. In each experiment, we observe an increase in C L as the liquid is compressed, followed by a divergent region in C L as function of U p during the transition and finally a decay to a sound speed appropriate for a solid.…”

Section: Resolidificationmentioning

confidence: 99%

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Specifically Prescribed Dynamic Thermodynamic Paths and Resolidification Experiments

Nguyen¹,

Orlikowski²,

Streitz³

et al. 2004

AIP Conference Proceedings

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Abstract. We describe here a series of dynamic compression experiments using impactors with specifically prescribed density profiles. Building upon previous impactor designs, we compose our functionally graded density impactors of materials whose densities vary from about 0.1 g/cc to more than 15 g/cc. These impactors, whose density profiles are not restricted to be monotonic, can be used to generate prescribed thermodynamic paths in the targets. These paths include quasi-isentropes as well as combinations of shock, rarefraction, and quasi-isentropic compression waves. The time-scale of these experiments ranges from nanoseconds to several microseconds. Strain-rates in the quasi-isentropic compression experiments vary from approximately 10 4 s −1 to 10 6 s −1 . We applied this quasi-isentropic compression technique to resolidify water where ice is at a higher temperature than the initial water sample. The particle velocity of quasiisentropically compressed water exhibits a two-wave structure and sample thickness scales consistently with water-ice phase transition time. Experiments on resolidification of molten bismuth are also promising.

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Section: Resolidificationsupporting

confidence: 67%

Section: Resolidificationmentioning

confidence: 99%

Specifically Prescribed Dynamic Thermodynamic Paths and Resolidification Experiments

Nguyen¹,

Orlikowski²,

Streitz³

et al. 2004

AIP Conference Proceedings

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“…13. The particle velocity measured from the Bi/LiF interface indicates a later arrival of the first weak shock, which is consistent with the lower sound speed in liquid Bi, (1.65 km/s vs. 3.55 km/s in Cu) [19,20,21]. After three weak shocks in the Bi sample, the particle velocity continues to smoothly increase with the applied pressure, exhibiting all the same characteristics seen in the copper trace until approximately 1.2 µs, at which point the slope of the liquid Bi particle velocity flattens while the copper velocity continues to increase, suggesting the onset of the phase transition (point B in Fig.…”

Section: Resolidificationsupporting

confidence: 63%

“…due to the contribution of shear strength, which is non-existent in liquids [30]. The sound velocity of liquid bismuth at ambient pressure (near the starting point of our experiments) is 1.65 km/s [19,20,21]) and for solid bcc-bismuth at approximately 0.1 Mbar on the Hugoniot (near the end point of our compression path), the sound velocity is 2.9 -3.1 km/s [31,20], suggesting that we should observe a large change in sound velocity upon resolidification. In each experiment, we observe an increase in C L as the liquid is compressed, followed by a divergent region in C L as function of U p during the transition and finally a decay to a sound speed appropriate for a solid.…”

Section: Resolidificationmentioning

confidence: 99%

Final Report 02-ERD-033: Rapid Resolidification of Metals using Dynamic Compression

Streitz¹,

Nguyen²,

Orlikowski³

et al. 2005

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The purpose of this project is to develop a greater understanding of the kinetics involved during a liquid-solid phase transition occuring at high pressure and temperature. Kinetic limitations are known to play a large role in the dynamics of solidification at low temperatures, determining, e.g., whether a material crystallizes upon freezing or becomes an amorphous solid. The role of kinetics is not at all understood in transitions at high temperature when extreme pressures are involved. In order to investigate time scales during a dynamic compression experiment we needed to create an ability to alter the length of time spent by the sample in the transition region. Traditionally, the extreme high-pressure phase diagram is studied through a few static and dynamic techniques: static compression involving diamond anvil cells (DAC) [1], shock compression [2, 3], and quasi-isentropic compression [4, 5, 6, 7, 8, 9, 10]. Static DAC experiments explore equilibrium material properties along an isotherm or an isobar [1]. Dynamic material properties can be explored with shock compression [2, 3], probing single states on the Hugoniot, or with quasi-isentropic compression [4

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“…26 This improved analysis takes into account both the metal cooling at the interface with the anvil (even if the glue acts as a thermal insulator) and the increase of interface temperature due to the series of shock-reshock occurring inside the glue layer. 27 This last phenomenon is particularly important in the case of a lead-sapphire target because the shock-impedances of these materials are much higher than that of the glue. However, as our experimental points are in the solid-liquid coexistence region, the consequence of both effects is only a variation of the solid-liquid proportion.…”

Section: Iv3 Experimental Resultsmentioning

confidence: 99%

Measurement of the shock-heated melt curve of lead using pyrometry and reflectometry

Partouche-Sebban

Pélissier

Abeyta

et al. 2005

Journal of Applied Physics

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Data on the high-pressure melting temperatures of metals is of great interest in several fields of physics including geophysics. Measuring melt curves is difficult but can be performed in static experiments (with laser-heated diamond-anvil cells for instance) or dynamically (i.e., using shock experiments). However, at the present time, both a Currently at Los Alamos National Laboratory 2 experimental and theoretical results for the melt curve of lead are at too much variance to be considered definitive. As a result, we decided to perform a series of shock experiments designed to provide a measurement of the melt curve of lead up to about 50 GPa in pressure. At the same time, we developed and fielded a new reflectivity diagnostic, using it to make measurements on tin. The results show that the melt curve of lead is somewhat higher than the one previously obtained with static compression and heating techniques.

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A model-potential approach for bismuth: II. behaviour under shock loading

Cited by 15 publications

References 10 publications

Specifically Prescribed Dynamic Thermodynamic Paths and Resolidification Experiments

Specifically Prescribed Dynamic Thermodynamic Paths and Resolidification Experiments

Final Report 02-ERD-033: Rapid Resolidification of Metals using Dynamic Compression

Measurement of the shock-heated melt curve of lead using pyrometry and reflectometry

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