A model-potential approach for bismuth (I). Densification and melting curve calculation

Pélissier, J.; Wetta, Nadine

doi:10.1016/s0378-4371(00)00514-8

Cited by 20 publications

(10 citation statements)

References 39 publications

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“…1,2 Besides the possible liquid polymorphism, 3 Bi has around 10 polytypes as well as anomalous melting. This complexity has severely hindered the understanding of its structural dynamics under compression.…”

mentioning

confidence: 99%

Complex structural dynamics of bismuth under laser-driven compression

Hu¹,

Ichiyanagi²,

Doki³

et al. 2013

Applied Physics Letters

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With the aid of nanosecond time-resolved X-ray diffraction techniques, we have explored the complex structural dynamics of bismuth under laser-driven compression. The results demonstrate that shocked bismuth undergoes a series of structural transformations involving four solid structures: the Bi-I, Bi-II, Bi-III and Bi-V phases. The transformation from the Bi-I phase to the Bi-V phase occurs within 4 ns under shock compression at ~11 GPa, showing no transient phases with the available experimental conditions. Successive phase transitions (Bi-V->Bi-III->Bi-II->Bi-I) during the shock release within 30 ns have also been resolved, which were inaccessible using other dynamic techniques.Comment: 17 pages, 4 figures, Appl. Phys. Lett. accepte

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mentioning

confidence: 99%

Complex structural dynamics of bismuth under laser-driven compression

Hu¹,

Ichiyanagi²,

Doki³

et al. 2013

Applied Physics Letters

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“…The subscript " ℎ, " stands for the phonon contribution in the bulk matrix, while the subscript " ℎ" denotes the phonon contribution in the nanoparticle (also equal to the one in the nanofilm in the previous section). It is important to note that equation (39) stands for the effective thermal conductivity that would be measured in a nanocomposite composed out of a bulk matrix and a volume fraction of nanoparticles; it is thus a combination of macroscopic and microscopic heat transfer phenomena. In thermoelectric devices, the combination of macroscopic and microscopic phenomena can lead to different results as the nanoparticle volume fraction changes.…”

Section: Extension To Nanocomposite Thermoelectric Devicesmentioning

confidence: 99%

“…This gives with the electron version of Eq. (2) an electron specific heat capacity of 0.088 MJ/m 3 K. Assuming that the total specific heat capacity (1.21 MJ/m 3 K [39]) is the sum of the electron and phonon ones, we can find the phonon specific heat capacity of 1.12 MJ/m 3 K. The phonon mean free path is 3.0 nm [40]. Via Eq.…”

Section: Materials Properties For Bi and Bi2te3mentioning

confidence: 99%

An extended thermodynamic model for size-dependent thermoelectric properties at nanometric scales: Application to nanofilms, nanocomposites and thin nanocomposite films

Machrafi

2016

Applied Mathematical Modelling

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A new mathematical model is developed, describing size-dependent subcontinuum thermoelectric properties from an extended thermodynamic point of view. This model takes into account the non-local effects of heat transfer through phonons and electrons that are important at nanometric scales. These phenomena are extended to apply also for electric transfer as well as the Seebeck coefficient. This model includes at nanoscale size-dependent electron and phonon thermal conductivities, electric conductivity, Seebeck coefficient and carrier concentrations. We compared nanofilms to nanocomposites and assessed their thermoelectric performances in the form of a figure of merit using as an example Bismuth and BismuthTelluride materials. It appeared that the figure of merit increases considerably for nanofilms and nanocomposites with respect to bulk materials. This is caused by the scattering of phonons and electrons. Our model shows that this scattering effect is not only present at the boundary or particle-matrix interface of the nanosized material, but also within it. The effect of particle size and surface specularity has been investigated, showing that a decreasing value of the particle size and specularity increases the scattering effect and improves the thermoelectric properties. An extension towards thin films of nanocomposite has been presented.

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“…Bismuth has one of the most complicated phase diagrams, and its phase transition point is used as a pressure standard for static high-pressure experiments [53][54][55][56]. The kinetic process of the Bi-I to Bi-II For ∆t > 55 ns, the differential signal corresponding to the 110 peak of the tetragonal phase at 15˝is positive and negative at lower and higher angles, respectively.…”

Section: Phase Transition Dynamics In Polycrystalline Bismuthmentioning

confidence: 99%

Structural Dynamics of Materials under Shock Compression Investigated with Synchrotron Radiation

Ichiyanagi

Nakamura

2016

Metals

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Abstract:Characterizing material dynamics in non-equilibrium states is a current challenge in material and physical sciences. Combining laser and X-ray pulse sources enables the material dynamics in non-equilibrium conditions to be directly monitored. In this article, we review our nanosecond time-resolved X-ray diffraction studies with 100-ps X-ray pulses from synchrotron radiation concerning the dynamics of structural phase transitions in non-equilibrium high-pressure conditions induced by laser shock compression. The time evolution of structural deformation of single crystals, polycrystals, and glass materials was investigated. In a single crystal of cadmium sulfide, the expected phase transition was not induced within 10 ns at a peak pressure of 3.92 GPa, and an over-compressed structure was formed. In a polycrystalline sample of Y 2 O 3 stabilized tetragonal zirconia, reversible phase transitions between tetragonal and monoclinic phases occur within 20 ns under laser-induced compression and release processes at a peak pressure of 9.8 GPa.In polycrystalline bismuth, a sudden transition from Bi-I to Bi-V phase occurs within approximately 5 ns at 11 GPa, and sequential V-III-II-I phase transitions occur within 30 ns during the pressure release process. In fused silica shocked at 3.5 GPa, an intermediate-range structural change in the nonlinear elastic region was observed.

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A model-potential approach for bismuth (I). Densification and melting curve calculation

Cited by 20 publications

References 39 publications

Complex structural dynamics of bismuth under laser-driven compression

Complex structural dynamics of bismuth under laser-driven compression

An extended thermodynamic model for size-dependent thermoelectric properties at nanometric scales: Application to nanofilms, nanocomposites and thin nanocomposite films

Structural Dynamics of Materials under Shock Compression Investigated with Synchrotron Radiation

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